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n Merlin Gerin n Modicon n Square D n Telemecanique

Coordinationand protectionof busbar distribution

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1Contents

1. Busbar distribution system ............................................................

1.1 Performance criteria of a LV Busbar distribution .........................

1.2 Functions..........................................................................................- Level A : transmission and distribution with a small quantity of tap

points ........................................................................................................- Level B : distribution with a large quantity of tap points ..................- Level C : the final distribtution .........................................................

1.3 IEC 439.2 standards.........................................................................

1.4 BBT protection .................................................................................- Overload protection .........................................................................- Short-circuit protection by circuit-breaker ........................................

1.5 Busbar distribution coordination ...................................................

1.6 Summarizing busbar distribution characteristics ........................

2. The Schneider busbar distribution System ..................................

2.1 Telemecanique BBT/MerlinGerin circuit-breaker coordination ...- Protection of a transmission or distribution BBT downstream from

the Main Switchboard (MSB) ...................................................................- Protection of a BBT by an NS400N limiting circuit-breaker ............

2.2 Exclusive Features of the Schneider :Enhanced bubar distribution coordination ...................................- Application : enhanced BBT protection ...........................................

2.3 Final distribution..............................................................................

2.4 Advantages of the Schneider System ...........................................- BBT protection.................................................................................- tap off boxes ....................................................................................- Final distribution ..............................................................................

2.5 Advantages and exclusive features of the Schneider System....- Comprehensive coordination choice guide tables ...........................- standard performance circuit-breakers for all Isc < 70 kA ..............- Optimization of the taap off box offer ..............................................

2.6 Exclusive features and advantages of the Schneider System ....- Sumarizing table ..............................................................................

3. Tables ................................................................................................

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3Design and production of a busbar distribution installation forindustrial and commercial buildings must meet 3 mainrequirements: progressive upgradeability of the installation,simplicity and dependability. Busbar distribution ensuresthese requirements are fully met.

Busbar distributionsystem

n 1. Progressive upgradeability of the installation

Flexibility and Adaptability have become the key words in all commercialand industrial activities which need to quickly adapt to the market in order to:v meet their customers needs,v cope with rapid changes and fluctuations in demand.

These performance criteria are expressed in terms of: quantity of goods to be produced or of services to be provided....v continually decreasing manufacturing lead time,v quality: the level of quality of the products and associated services must beequivalent whatever the decisive parameters (short lead time, large quantity to beproduced,...).

This implies permanent adaptation of production means as production rates arestepped up after initial commissioning, and the process is completed by newmachines.

Busbar distribution, with its highly flexible design, fully covers these requirements.

n 2. Simplicity of the busbuar distribution

v easy to design: the study is feasible regardless of energy distribution and loadlayout. Choice of equipment is predetermined and optimized.v easy to install thanks to the factory-built concept.

n 3. Dependability

Dependable electrical distribution is optimized as a means of guaranteeing:v safety of persons and equipmentv continuity of service (choice of grounding system, implementation ofdiscrimination techniques, breaking not required when making changes to theinstallation....)v reliability (reliable switchgear, factory-mounted subassemblies...)v easy maintenance (simple, rapid modifications).Dependability also guarantees an economic operating solution.

Busbar distribution fully meets these criteria.

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1.1 Performance criteria of aLV Busbar distribution

Three performancecriteria for a busbardistribution installation:

n upgradeabilityn simplicityn dependability

4Busbar distributionsystem

In large sitesBuildings in excess of 5 000 m2

Distribution is divided up into3 separate levels between thetransformer and the finalapplications:v level A: Transmission anddistribution with a smallquantity of tap points,v level B: Distribution with alarge quantity of tap pointsv level C: the final distribution

Busbar Trunking (BBT)distribution fully covers therequirements of each level byproviding:v functions that are oftenspecific in nature;v a high degree of operating

The following diagrams represent standard installations which cover most casesencountered in practice.

i 400 A

i 160 A15 to 25 kAi 400 A

i 800 A

i 40 A i 5 to10 kAi 40/63 A i 10 to 16 kA

i 25 A(40 A)

Icc 10 to15 kA

i 400 A

100 to 250 A

MMM

Isc 20 to 50 kA

Isc 10 to 40 kA

20 to 70 kA

Isc 20 to 70 kA

Isc 30 to 80 kA

with a smallquantity oftap points

T1 transmission

MSB

workshop 2 supplyworkwhop 1supply

1000 to 5000 A

T transmission

large manufacturing processindustry

manufacturing process moving tool(maintenance, servicing)

lighting

automationenclosure

use

automationenclosure

socketenclosure lighting

NB. right next to the machine orbuilt into the machine

hall 1 supply

hall 2supply

hall 3supply

bay 2supply

distributionwith a largequantity of tappoints bay 1

supply

E 36

283E

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5In medium-sized and small sitesBuildings smaller than 5 000 m2

Level ATransmission anddistributionwith a smallquantity oftap points.NB : does not concern medium-sizedand small sites .

Level BDistributionwith a largequantity oftap points.

Level CEnergy utilisation.

Systme de distributionrpartie

400 A

30 mA

warehouse storage

10 kA

ID63 s60 A

PC

100 to 250 A

25 to 40 A

M

< 63 A

lighting

homogeneous load,offices

final distribution purpose of building

10 to 15 kA

10 to 15 kA

i 5 kA

15 kA

E 36

853E


n continuity of service***

n safety**

Performancecriteria

Upgradeability

Simplicity

Requirement

**

***

Comments

modifications at this level of theinstallation although rare are important;new layouts do not affect maindistribution

Power is available at all points of theinstallation as from the design stage.Implementation simplified by thefactory-built BBT concept.

DependabilityDistribution is entirely placeddownstream. Maintenance is performedwith power on.

Safety of persons must be guaranteed.Maintenance is rare and is carried outby qualified staff. A high degree ofreliability in the event of an electricalfault is required.

* : minor requirement ** : average requirement *** : major requirement

n Busbar Trunking (BBT) with a small quantity of tap points fortransmission and distribution

The T0 busbar trunkings convey energy from the MV/LV transformer directly to theMain Switchboard (MSB). The T1 busbar trunkings, downstream from the MainSwitchboard (MSB), convey and distribute energy to BBTs with a large quantity oftap points which supply the various workshops. Use transmission and distributionBBTs with a small quantity of tap points ensures a simple, suitable solution:v the characteristics of the transmission BBTs authorize current ratings ranging from1000 A to 5000 A and short-circuit withstand levels up to 150 kA.v use of a flexible link to level B BBTs ensures technological continuity and flexibilityof the installation.v BBTs have a small quantity of tap points, as the number of feeders to be supplied(workshops, halls) is small.v tap off boxes are of the power on fixed or withdrawable type.

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Level A: transmission and distributionwith a small quantity of tap points

n RequirementsThis level corresponds to Transformer/Main Switchboard (MSB) supply andmain distribution downstream from the Main Switchboard (MSB).The requirements of this level as far as performance criteria are concerned(see p. 3) are summarized in the table below:

BBT in transmission anddistribution with a smallquantity of tap pointsn high current ratings from1000A to 5000 An high short-circuit withstandup to 150 kAn technological continuityn flexibilityBBT in Distribution with alarge quantity of tap points:n numerous tap off socketsn box positioning flexibilityn safe, easy handlingFinal distribution:n on-load opening(emergency breaking)n local disconnection.

7* : minor requirement ** : average requirement *** : major requirement

n Busbar Trunking (BBT) with a large quantityof tap points for distribution

BBT distribution meets the operators needs:v a large quantity of tap off sockets.v 100% safe connection of tap off boxes with power on.v boxes can be placed anywhere on the BBT.v easy, fully safe disassembling/reassembling/addition of tap off boxes.v protection device placed near to the user, thereby ensuring easy handling.Busbar Trunkings comply with the IEC 439-2 standard (see page 9) whichguarantees their quality and reliability whatever changes are made to the installation.

n Requirements

Two types of loads must be supplied downstream from the distribution BBTs:v workshops and large machines (automation cubicle). In this case the short-circuitand current levels may still be high (20 to 70 kA respectively and up to 800 A) (seelarge sites on page 4).v bays and small machines (switchboard, automation enclosure, lighting circuit...).Short-circuit and power levels are lower, 10 to 40 kA respectively and up to 400 A.Performance criteria are summarized in the table below

Modifications made with power onmust be 100% safe: direct contact protection polarization for proper installationof the tap off boxes performances of the tap off boxequipped with its circuit-breakerautomatically compatible with the Iscat the considered point.

***n safety

Requirement CommentsPerformancecriteria

DependabilityModifications are made withoutbreaking.The tap off boxes can be connectedand disconnected with power on.

***n continuity of service

On design and installation.It must be possible to place the tap offboxes anywhere on the busbar trunkingwhatever the Isc level.

***Simplicity

Major modifications are possible. Thetap off points (loads) evolve physicallyand electrically, thus calling for: distribution with high density tap offsockets, upgradeability without interrruptionof service continuity.

***Upgradeability


Level B: distribution with a largequantity of tap points

8* : minor requirement ** : average requirement *** : major requirement

n The final distribution

It must meet a number of characteristics in order to ensure system performance, inparticular as concerns continuity of service and safety. On-load opening, necessaryfor emergency breaking, and disconnection are requirements to be built into theenclosure incoming switch. Moreover, the control and protection switchgear areeasily accessible to the user, thus making them easy to handle.

bnrbirrgojk,,

Level C : the final distribution

n Requirements

Downstream final distribution is often linked to the load. The performance criteriarequirements are:

Comments

Of persons and equipment.n safety

RequirementPerformancecriteria

DependabilityIt is vital that protection of the load(s) inthe automation cubicle be fullycoordinated with the upstreamprotection devices.

n continuity of service

Simplicity

The BBT tap off boxes must bestandard. Protection devices must havea wide setting range.

Upgradeability

***

***

**

***

connectingcable

BBT

tap offcircuit-breaker

isolatingswitch

final distributioncircuit-breaker

final distributionenclosure

E 36

282E

E 39

731E

connectingcable

BBT


isolatingswitch

industrialcontrolcircuit-breaker

automationcubicle


1.3 IEC 439.2 standardsIn

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ort

This standard concerns LV switchgear assemblies.Busbar trunkings must comply with the ruleslaid down in publications 439-1 and 2.

n Dfinitions

Busbar trunking:Switchgear type tested assembly in the form of a conductive network concerning,in a duct, cableway or similar enclosure, busbars which are supportedby insulating materials.This assembly can be made up of:- busbar parts with or without tap off points,- power supply, flexible links,- branch busbar parts.

n Electrical characteritics of the assemblies

The manufacturer must specify the mean values for the various phases:R: mean ohmic resistance of the busbar trunking per meterX: mean reactance of the busbar trunking per meterZf: impedance per meter of loop length, including the protection circuit (PE)and the phase giving the highest impedance.Indirect contact protection by automatic power supply breaking usingover current protection devices.

n Construction arrangements

Busbar trunkings must be designed as type tested LV switchgear assemblies (TTA).According to the manufacturers instructions, BBTs are designed to withstandmechanical loads.For safety reasons, an BBT equipped with tap off points must be designedin such a way as to prevent incorrect connection of the tap off parts.If three-phase ac is used, phase order must be constant throughout the BBT.Temperature rise limits are defined on the enclosures and connection terminals.

n Test specifications

Type tests are designed to check compliance with the specifications laid down for agiven BBT type.Type tests are carried out on a copy of an BBT or on an BBT type produced usingthe same or similar drawings.Type tests consist of:- checking temperature rise limits, dielectric properties, short-circuit withstand,electrical continuity of the protection circuit, clearances and creepage distances,mechanical operation, degree of protection, resistance, reactance and impedance,and sturdiness of the construction.The standard describes all the conditions and provisions of the tests laid down and,if necessary, the results to be obtained.

IEC 439-1 :LV switchgear assembliesIEC 439-2 :second part : specific busbartrunking rules.GeneralArea of application:busbar trunkings for powerand lighting distribution.Factory quality :Manufacturers guaranteecharacterizing the product.Product quality anddependability guaranteed by aseries of factory tests.

10


1.4 BBT protection

This must be provided in accordance with installation standards.

The busbar trunking supplies loads: the total load current is lr.

Sizing characteristics for choice of BBT and overload protection are:n current rating lb = k1 x IT (k1 is the concentrationfactor)n rated busbar trunking current lnc > lbn permissible current as a function of temperature lz = f1 x lnc(f1 is the temperature factor)n derating factor k2 linked to the type of switchgear: - fuse k2 = 1.1 - circuit-breaker k2 = 1

For extension purposes, busbar trunking is normally protected for its rated currentlnc (or for their permissible current lz if the temperature factor f1 is applied).

In order to take account of busbar trunking thermal overload protection, the variousprotection switchgear technologies and the maximum opening currents forprotection devices in overload conditions must be considered.

n Calibration of thermal asymptotesv the distribution fuse is calibrated to trip on overloads of between 1.25 and 1.6times its rated curent (fuse ln)v the circuit-breaker is calibrated to trip on overloads of between 1.05 and 1.3(1.2 for circuit-breakers with electronic protection) times its setting current(lr as a function of circuit-breaker ln).

n Maximum opening currentv this current is set at most by the installation standards (IEC 364, NFC 15-100,...)to 1.45 times the current permissible to the busbar trunking.

Example for a current lb = 400 A in an ambient temperature of 35C:v Fuse protection:

lnc = lb x f1 x k2 = 400 x 1 x 1.1 = 440 AThe busbar trunking chosen is KSA50 (lnc = 500 A)

v Circuit-breaker protection:lnc = lb x f1 x k2 = 400 x 1 x 1 = 440 A

The busbar trunking chosen is KSA40 (lnc = 400 A)

A 20% shift of the openingcurrents results in aminimum overcalibration of10% of the busbar trunkingif fuse protection is used.

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Overload protection

circuit-breaker

fuse

I

t(s) 1,05 to 1,3 In

InIz = In

1000

1,45 Iz

InIz = 1,1 InIz = Inc if fz = 1

I

1,25 to 1,6 In

1,45 Iz

t(s)

E

3959

5EE

3959

4E

11

n Fineness of the thermal setting

v the fuse is given a fixed rating. Current changes in the device to be protectedrequire fuse replacement.The difference between 2 fuse ratings is approximately 25%. Standard ratingsare given according to the series of characteristic numbers of the Renard series.For example: 40 - 50 - 63 - 80 - 100 - 125 - 160 - 200 - etc.v the circuit-breaker offers a setting fineness of:- 5% for circuit-breakers equipped with conventional thermal-magnetic trip units,- 3% for circuit-breakers equipped with electronic trip units.For example: a circuit-breaker with a nominal rating of 100 A can easily be set tovalues of lr = 100A, 95A, 90A, 85A, 80A.For example: a circuit-breaker with a nominal rating of 100 A set at 90 A will be usedto protect a KSA10 busbar trunking (lnc = 100 A) which is used for an ambienttemperature of 50C (see table of maximum permissible temperaturesas a function of operating temperature).

n Extensive setting range of circuit-breakers equipped withelectronic trip units

Circuit-breakers equipped with electronic trip units or setting dynamics in:v thermal protection lr adjustable from 0.4 ln to lnv short-circuit protection from 2 lr to 10 lrFor example: a 250 A circuit-breaker (NS250N equipped with an STR22SE)can easily be set in:v thermal protection of 100 to 250 Av short-circuit protection of 200 to 2500 A

Exemple of setting possibilities

This ensures a high degree of flexibility with respect to:n modifications (flexibility), extensions (upgradeability): protection devices areeasily adapted to the application requiring protection and to the groundingsystem used (protection of persons and equipment),n maintenance: use of this type of device considerably reducesmaintenance component stocks.


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If operating conditions aredifferent from rated conditionsof use, the circuit-breakeroffers enhanced optimizationof busbar trunking protection.(e.g. operation at highambient temperatures of45/50C).

Setting circuit-breakersequipped with electronictrip units:n thermal protection lradjustable from 0.4 ln to lnn short-circuit protection from2 lr to 10 lrn increased flexibility andupgradeability.

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n Inherent BBT characteristiques

BBT short-circuit sizing is determined by the following characteristics:n the maximum peak current, peak l:This characteristic expresses the instantaneous electrodynamic withstand limits ofthe busbar trunking. Peak current value is often the most restrictive instantaneouscharacteristic for the protection device.n maximum short-term rms current lcw:This characteristic expresses the permissible temperature rise limit of conductors fora given period of time (0.1 to 1 s).n the thermal stress in A2s:This characteristic expresses the instantaneous thermal stress withstand of the BBT.Normally, if the short-circuit generates fault conditions that are compatible with thefirst two characteristics, this constraint is naturally satisfied .The assumed short-circuit current to be considered for BBT protection is the onefound at supply box level.

n Circuit-breaker characteristics

Circuit-breaker D must meet the requirements of product construction standards(IEC 947-2,...) and installation standards (IEC 364 or relevant country standards), i.e.its breaking capacity lcu* must be greater than short-circuit current Isc at the pointwhere it is installed.*installation standard IEC 364 and the construction standards specify that the breaking capacityof a circuit-breaker is:v the ultimate breaking capacity, lcu, if it is not coordinated with an upstream protection devicev the breaking capacity enhanced by cascading, if there is coordination with the upstreamprotection device.

n Applications

n Two cases must be considered :

v directely protected busbar trunking

circuit-breaker lcu > assumed Isc at point A

BBT peak l > asymmetrical assumed or limited Isc at point ABBT thermal withstand in lcw > thermal stress passing through the BBT

v busbar trunking protected downstream from a cable

circuit-breaker lcu > assumed Isc at point A

BBT peak l > asymmetrical assumed or limited Isc at point BBBT thermal withstand in lcw > thermal stress passing through the BBT

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BBT sizing is determinedby 3 types ofcharacteristics:n the maximum peakcurrent, peak ln the maximum short-termrms current, lcwn the thermal stress(in A2s).

Directly protected BBT

BBT protected downstreamfrom a cable

Short-circuit protection by circuit-breaker

BBT

circuit-breaker

A

Isc at point A

E 36

854E

B

circuit-breaker

cable

BBT

A'

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13

This coordination depends on the type of circuit-breaker protecting the busbartrunking.

n Non-limiting or time-delayed circuit-breaker

Non-limiting or time-delayed circuit-breakerThese are non-limiting (instantaneous or time-delayed) circuit-breakers and time-delayed limiting circuit-breakers, mainly of the air power (> 800 A) type.The busbar trunking must be able to withstand the fault peak current to which it maybe submitted as well as thermal withstand during any time delay:v the permissible peak current, peak l, of the BBT must be greater than the peakvalue of the assumed asymmetrical short-circuit current, asymm. Isc, at point A.The value of the asymmetrical short-circuit current is obtained from the value of thesymmetrical short-circuit current, Isc, multiplied by a standardized asymmetry factor(k).The first value of the 1st short-circuit asymmetry peak in the transient state is theone that is taken into account.


For example: for a circuit with a assumed short-circuit current of 50 kA rms, the firstpeak reaches 105 kA (50 kA x 2.1): see figure opposite.

v the short-term short-circuit current, lcw, of the BBT, must be greater than thecurrent flowing through the installation for the duration of the short-circuit Isc(duration T - total breaking time - including the time delay if any -).For example: a KTA16 BBT has an lcw characteristic of 60 kA for T = 1 second, i.e. athermal stress withstand expressed in A2s equal to 3.6x109 A2s.

If one of these relationships is not verified, a suitable higher rating must be chosenfor the BBT.

Isc : assumed symmetrical short-circuit assymetric factorkA (rms value) k4,5 I 6 1,56 < I 10 1,710 < I 20 2,020 < I 50 2,150 < I 2,2

Standardized table for calculating the asymmetrical short-circuit

current value of the 1st peak as a functionof rms Isc

transient and steady states of a short-term short-circuit

Circuit-breaker/busbar trunking coordination

busbar trunkingIcw (u T)T = 1s

Isc

I1

busbar trunkingpeak I

a s y m mI s c

T

t

250

200

150

100

50

04,5 6 10 20

rms Isc

Ipeak (kA)

50 100

105 kA

E 38

884E

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n limiting circuit-breaker

This mainly concerns protection of BBTs by moulded case type circuit-breakers(< 1250 A).In this case it is ensured that the BBT withstands the peak current limitedby the protection device and the corresponding thermal stress.v the current limited (peak l) by the circuit-breaker is < the peak current permissibleto the BBT.v the thermal stress limited by the circuit-breaker is < the thermal stress permissibleto the BBT.

Checking BBT withstand in peak l


If either of these conditions is not met, oversizing of the BBT will be required.

Checking BBt withstand in A2s

Icc

Ipeak (kA)

assumed short-circuitcurrent

peak currentlimited in thebusbar trunking

Ipeak

IL current limitationcurve

Iscnon-limitingpeak current

maximum currentpermissible to thebusbar trunking

Icc

A2s

assumed short-circuitcurrent

thermal stresspermissible to thebusbar

thermal stresslimitation curvethermal stress

limited in thebusbar trunking

E 38

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BBT protection summarizing table


n the busbar trunking short-circuit protection level can be either total or partial:v total protection: the busbar trunking is protected up to the ultimate breakingcapacity of the circuit-breakerv partial protection: the busbar trunking is protected up to a high short-circuitcurrent level (e.g. 55 kA) but less than circuit-breaker ultimate breaking capacity(lcu) (e.g. lcu = 70 kA).

Network characteristicsIscCircuit-breaker characteristics / Short-circuit constraintsIcu Isc at point ABBT characteristics / Short-circuit constraints (1)peak l Icw for T (3) A2sBBT withstand permissible instantaneousat peak current short-term current thermal withstandk kA rms x f(T) kA2s

time-delayed non-limiting peak l Isc x k (2) Icw Icccircuit-breakerlimiting breaker-circuit peak l IL limited kA2s (BBT) kA2s limited

by the circuit-breaker by the circuit-breaker

characteristics that are not applicable or that are naturally verified(1)

the Isc of the network under consideration is that at the BBT connection point (at point A)asymmetry factor (see page 13)(2)

T: total breaking time including any time delays.

Limiting circuit-breakerNon-limiting circuit-breaker

IscBBT2protectionlimit

partialprotection

BBT 1

circuit-breakercurve

total protection

BBT 2

I (12 kA) Icu (25 kA)

Ipeak ()

Isc(150 kA)

Ipeak ()

BBT2protectionlimit

partialprotection

BBT 1

limitingcircuit-breakercurve

total protection

BBT 2

I (25 kA) Icu

E

3959

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E

3959

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BBT

circuit-breaker

A

Isc at point A

E 36

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B

circuit-breaker

cable

BBT

A'

E

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1.6 Summarizing busbardistribution characteristics

The performance criteria of a distributed electrical distribution installationin industrial and commercial buildings call for functions whose characteristicsare summarized in the table below.

Level A Level B Level Ctransmission and Distribution distribution with with a large final

Criteria relevant functions a small quantity quantity of distributionof tap points tap points

upgradeability numerous tap off points v nsimplicity easy study and installation n n v

easy site modification v n vcontinuity of service discrimination of protection devices n n n

modification with power on v nprotection device easily reset v v n

safety controlled fault parameters (1) n n non-load braeking and disconnection n n n

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Protection devicecoordination:System performance isguaranteed bystandardization of circuit-breaker protection and BBTbusbar distribution.The performance of a busbardistribution system dependson the specific characteristicsof each of its componentparts.This performance will beoptimized by providing propercoordination, obtained by asystem type design.

n vital maximum performancev normal performance

(1) System global control - Circuit-breaker protection device coordination - Inherent BBT performance - Protection of persons and equipment - Compliance with standards - etc...

1.5 Busbar distributioncoordination

Continuity ofservice and discriminationThe previous chapters dealt with BBT overload and short-circuit protection.An installation is always made up of a number of distribution levels.Continuity of service must be guaranteed by ascending coordinationof protection devices from the load to the source. This coordination relieson discrimination techniques.Discrimination of protection devices consists of coordinating automaticprotection devices so that a fault occurring at any point of the networkis eliminated by the circuit-breaker immediately upstream from it andby this circuit-breaker alone.The performance of an electrical distribution system is guaranteed bystandardization of circuit-breaker protection and BBT busbar distribution.

17

Busbar distribution fully satisfies requirements forupgradeability, simplicity, continuity of service and safety.

Schneider recommends a System type approach to perform the above functions.

These solutions are based on a Telemecanique BBT busbar distribution system,protected by Merlin Gerin circuit-breakers, and provide:n simplicity of choicen homogeneity of solutionsn rationalization of componentsn a manufacturers guarantee of System coordination

The two block diagrams on the following pages give some examples of theSchneider circuit-breaker protected busbar distribution System.

The Schneider busbardistribution System

18

Level A

level B

Level C

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pushpushtoto

triptrip

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.1.1.2.2

.4.4

N

pushpushtoto

triptrip

KT20

KSA40

KSA16

KBB

pushpushtoto

triptrip

KT20

Example of an industrial site

In large sitesBuildings in excess of 5 000 m2

The Schneider busbardistribution System

E

4013

9E

E

3973

3E

MM

1600A55kA

400A40kA

160A30kA

400A45kA

10kA 35kA

25A15 kA

19Example of a supermarket

In medium-sized and small sitesBuildings smaller than 5 000 m2

Systme Schneiderde distribution rpartie

Level C

Level B

MgN 1

N 2

multi 9

DPNC40230Va4500

20750

3

pushpushtoto

triptrip

pushpushtoto

triptrip

T

OFFOFF

T

OFF

KNA63

KSA16

KBA

E

3879

0E

E

4014

0E

M

160A10kA

63A8kA

25A5kA

400A15kA

20


The approach used in the study examined earlier, applied to Merlin Gerin andTelemecanique products, enhances the Schneider System.

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2.1 Telemecanique BBT/Merlin Gerincircuit-breaker coordination

In order to simplify choice,Schneider presents theresults of each Merlin Gerincircuit-breaker/TelemecaniqueBBT combination directly intable form (see page 30onwards).

The diagram opposite shows a T1 transmission BBT and a KT-16 distribution BBT(1600 A) protected by a Masterpact M16 circuit-breaker with a 0.5 s time delay.n at point A, at the supply end of the KT-16 distribution BBT, the Isc is 55 kA.

The conditions laid down on page 15 are carefully verified:n for the Masterpact Isc (65 kA) > Isc (55 kW) at point A of the installationn for the busbar trunkingv the withstand current lcw (66 kA) for 1 s is greater than the short-circuitcurrent Isc (55 kA) for T = 0.5 sv the peak withstand, peak l (130 kA) of the busbar trunking is greater thanthe maximum asymmetrical peak current.

Protection of a transmission or distribution BBTdownstream from the Main Switchboard (MSB)

The following table lists the various constraints and characteristics of the circuit-breaker and busbar trunking.

Network characteristics at point AIsc = 55 kA in ACircuit-breaker characteristics / short-circuit constraintsIcu = 65 kA 55 kA at point ABTT characteristics / short-circuit constraintspeak l = 130 kA Icw = 66 kA for 1s A2sBBT withstand permissible short-term instantaneousat peak current current thermal withstandk kA rms x f(1s) kA2s

non-limiting circuit-breaker 130 kA 55 kA x 2,2 66 kA 55 kAfor 1s

A

Isc = 55 kA

MSB

A

Isc = 55 kA

MSB

transmissionBBT

distributionBBT

E 36

856E

E 39

591E

naturally verified characteristics

21

n Limiting capacity

The circuit-breakers in the Compact NS range are limiting circuit-breakerswith a high limiting capacity.A circuit-breakers limiting capacity expresses its ability only to let a limitedcurrent IL lower than the assumed Isc asymmetrical peak short-circuit current,through on a short-circuit.The consequence is a considerable reduction in electrodynamic and thermalstresses in the installation requiring protection.

n Applying limiting capacity to BBT protection

This fault current limitation means that BBT protection level is extremely high.With present-day circuit-breakers (Compact NS type), a 10% limitation(IL/asymmetrical Isc) reduces to less than 1% the fault current flowing throughthe installation.The diagram opposite shows protection of the KSA40 distribution busbar trunkingby an NS400N limiting circuit-breaker. In this diagram:n the Isc is 45 kA at point AA study of the various limitation curves shows that:n in B, the limited Isc is only 26 kA (instead of nearly 84 kA without limitation)n the energy limited in A2s is far lower than BBT withstand.

a. current limitation NS

b. energy limitation NS


Protection of an BBT by an NS400Nlimiting circuit-breaker

Protection of an BBT by an NS400N limiting circuit-breaker

assumed Iscat "A" 45 kA

NS400N

KSA40assumed Iscat "B" 40 kA E

3685

7E

Isc

A2s

354 x 106

1,6 x 106

40 kA

E 38

936E

E 38

937E

Isc

26 k

48 k

40 kA

kA peak

22

The following table lists the various constraints and characteristics of the circuit-breaker and BBT.

Network characteristicsIsc = 45 kA at point A Isc = 40 kA at point BCircuit-breaker characteristics / Short-circuit constraintsIcu = 45 kA 45 kA at point ABBT characteristics / Short-circuit constraints (at point B)peak l = 48 k Icw for Ts A2s = 354 x 106 A2sBBT withstand permissible short-term instantaneousat peak current current thermical withstandk kA rms kA2s

limiting circuit-breaker 48 k IL = 28 k 354 x 106 1,6 x 106 A2s


unapplicable characteristics

This table shows that the limitation performance of the Compact NS is vital to reducethe stresses to which the busbar trunkings are subjected and in particular thethermal stress.The exceptional limitation of the peak current means that monitoring of the BBTthermal stress criterion can be ignored (limited I2t

23

Coordination between a Compact NS circuit-breaker (D1 placed upstream)and a downstream circuit-breaker (D2) from the Merlin Gerin ranges protecting an BBT, enhances the Isc withstand performance of this BBT.Enhancement depends on the limitation performances and breaking techniqueof the Merlin Gerin circuit-breakers.

n Reminder: coordination between 2 protection devices

When 2 circuit-breakers are installed in series in an electrical installation,their behavior when a short-circuit occurs downstream is referred to by theterm coordination (see diagram opposite).

This term covers 2 notions:n discrimination: only the circuit-breaker placed immediately upstream from thefault eliminates the faultn cascading: the upstream circuit-breaker uses its limiting capacity to help thedownstream circuit-breaker eliminate the fault on breaking.

Thus, according to the level of short-circuit to be eliminated, D1 and D2 may be:n discriminating: only D2 will eliminate downstream faultsn cascading: D1 will help D2 eliminate short-circuits. In this case D2s short-circuitcapacity will be enhanced.

Implementation of a D1 upstream circuit-breaker of the Compact NS typecoordinated with a D2 downstream circuit-breaker from a Merlin Gerin range,simultaneously enhances:n breaking capacity by cascading of circuit-breaker D2,n as well as the discrimination level up to the enhanced breaking capacity of thecombination.

Coordination is defined and recognised by the switchgear standards (IEC 947) andinstallation standards (IEC 364 or relevant country standards), and is guaranteedby manufacturing tests or calculations.

Im

sjor

t

Coordination


2.2 Exclusive Features of the SchneiderSystem: Enhanced busbar distributioncoordination

D1

D2

E 38

883E

Enhanced coordination hasmany advantages:Exclusive features of theSchneider Systemn possibility of installingcircuit-breakers with standardbreaking capacity (anywhereon the tap off BBT) downstreamfrom an BBT protectedby a Compact NS.n standard guarantee of totaldistribution discrimination.

24

n Application: enhanced BBT protectionThis cascading technique also considerably enhances BBT withstand characteristicswith respect to the assumed short-circuit current.In the diagram opposite the KSA40 busbar trunking is protected by the NS 400 Ncircuit-breaker (D1). A KSA16 tap off protected by an NS160N (D2) circuit-breaker isplaced on this busbar trunking.

n without coordination, the very high limiting capacity of the NS160N alone alreadyprotects the KSA16 up to its ultimate breaking capacity Icu, i.e. 35 kA.

n however coordination performance is enhanced as a result of enhancedcoordination with the upstream NS400N:v enhanced breaking capacity of the NS160N which rises to 45 kA,v enhanced discrimination: due to the techniques developed in the NS typeranges, discrimination is total between the 2 protection devices, in other words up tothe enhanced breaking capacity of D2, i.e. 45 kA.v enhanced busbar trunking withstand: tested coordination of Canalis KSA16 isenhanced up to the enhanced Isc of the NS160N, i.e. 45 kA.

This exclusive Schneider System feature increases:n reliability, thanks to the high limitation of short-circuit current thermal andelectrodynamic stressesn continuity of electrical distribution service thanks to the increaseddiscrimination level.


Enhanced protection of a KSA-16 BBT by an NS160Ncircuit-breaker coordinated with an NS400N circuit-breaker.

The following table lists the various constraints and characteristicsof the circuit-breaker and BBT in coordination.

KSA40

KSA16

NS400ND1

NS160ND2

45 kAE 36

972E

BBT protection BBT protectionin coordination

Canalis protected by protected by limiting D2KSA 16 limiting D2 NS 160 N Icu = 35 kA

NS 160 N Icu = 35 kA coordinated upstreamwith D1NS400 N Icu = 45 kA

protection limitKSA16 Icc = 35 kA Icc = 45 kAdescrimination limit up to max. Isc = 35 kA up to max. Isc = 45 kA

according to upstream guaranteedprotection

KSA16 characteristic Maximum stresseson BBT if ashort-circuit occursIsc = 35 kA Isc = 45 kA

peak l = 22 k IL = 19 k IL = 20 kA2s = 20,2 106 A2s = 0,52 106 A2s = 0,6 106

25


The following diagrams optimize all the functions required for all industrial andcommercial building applications.

n Protection:v switchboard overcurrent protection is provided by the protection circuit-breaker(DD) installed in the tap off box.v feeder protection is provided by the circuit-breakers (DCI) installed at each feeder.

Continuity of service is optimum at feeder level:v thanks to enhanced total discrimination between the protection devicesv thanks to easy access and resetting of the protection devices.

n Maintenance: the switchboard incoming switch (IS) guarantees disconnection andthus safety for maintenance, servicing and upgrading of the installation.

n On-load opening: this function is performed by a switch. The incoming switchplaces the installation out of operation should a problem arise, either by manualcontrol or automatically using an emergency punch button. This safety functionrequires a high degree of reliability should a fault occur on the electrical installation.

2.3 Final distribution

Canalis


isolatingswitch

final distributioncircuit-breaker

final distributionenclosure

connectingcable

E 39

735E

E 41

500E

DD

IS

DCI

Canalis


isolatingswitch

Industrialcontrolcircuit-breaker

automationcubicle

connectingcable

26

n BBT protection

Merlin Gerin circuit-breakers offer:n overload and short-circuit protection,n an extensive setting range and thus protection device standardization,n coordination between the protection devices and the Telemecanique CanalisBBTs:v total discrimination:1 to 6300 A between all Merlin Gerin circuit-breakersv cascading:- enhancement of low and medium power BBT short-circuit protection devices, thusmeeting all the short-circuit levels encountered.- tap off protection using standard circuit-breakers regardless of where the tap offbox is placed on the Canalis BBT.n use of standard circuit-breakers simplifies the study process, while ensuring a highdegree of dependability.n quick, easy fault tracking.n simple reclosing ( resetting ) once the fault has been eliminated by the operator.

n Tap off boxes

The Schneider System Canalis tap off boxes satisfy operators needs in terms of:n installation upgradeability without production downtimesn continuity of servicen safety.The tap off boxes:v can be connected and disconnected with power on without risk to the operatorv are designed for installation at one-meter intervals on the distribution BBTs.

n Final distribution

The Merlin Gerin and Telemecanique protection switchgear optimizes switchboardfunctions.n Coordination of upstream protection devices is provided and guaranteed bySchneider:v for distribution applications between Merlin Gerin Compact/Compact NS circuit-breakers and Compact NS/Multi 9 circuit-breakers.v for industrial control applications between Merlin Gerin circuit-breakers andTelemecanique industrial control circuit-breakers (motor circuit-breaker, Integral,...).The coordination tables for the Merlin Gerin and Telemecanique protection circuit-breakers are available in the relevant product catalogs.n The Merlin Gerin and Telemecanique switches comply with the IEC 947-3standard, and are designed to ensure AC23 on-load breaking and disconnection.Their protection is guaranteed by coordination with the upstream Merlin Gerin circuit-breakers.


2.4 Advantages of the Schneider System

Canalis KSA busbar trunking

Tap off box

Prisma enclosureautomation cubicle

E42

563E

Switch

Automation enclosure

5212

5EE4

2563

E - 2

27

Total coordination of the Schneider System guarantees and enhances safetyof persons and equipment, continuity of service and installation upgradeabilityand simplicity.Total coordination is materialized by:

n comprehensive coordination choice guide tables

n Schneider proposes coordination tables for a busbar distribution systemfrom 1 to 5000 A:v Merlin Gerin circuit-breakers: Multi 9, Compact, Compact CM, Masterpactfrom 1 to 6300A.v Telemecanique BBT: lighting BBT, low, medium and high power distribution BBT.n Whatever the installations short-circuit current, 2 table types directly supplythe appropriate BBTs and circuit-breakers:v one to ensure coordinationv the other to ensure cascading and enhanced discrimination.

n standard performance circuit-breakers for all Isc < 70 kA

The BBT tap off boxes are equipped with standard Compact NS circuit-breakersand can be installed at any point of the BBT.

n optimization of the tap off box offer

The extensive setting ranges of the circuit-breakers equipped with electronictrip units.

n in thermal protection, Ir is adjustable from 0.4 to In,n in short-circuit protection, Im is adjustable from 2 to 10 Ir,allow optimization of the tap off box stocks required for maintenance and extensionpurposes.This feature helps enhance the natural flexibility and upgradeability of the BBTs.


2.5 Advantages and exclusive featuresof the Schneider System

28

(1) In particular thanks to :n a system coordinated from 40 to 5000 An cascading and total coordinition of protection device

Level A Level B Level Ctransmission and distribution with final distribution

distribution with a small a large quantityCriteria Relevant functions quantity of tap points of tap pointsupgradeabilityone tap off connection every meter BBT

extensive setting range of protection devices CB CBeasy installation BBT BBTstandard performance circuit-breakersfor all Isc 70 kA CB CB

simplicity comprehensive coordination choiceguide table BBT,CB BBT,CB BBT,CBoptimization of the tap off box offer CB CBeasy, rapid BBT installation BBT BBTeasy installation modification BBT BBTextensive protection enclosure range BBT BBT

continuty total discrimination of BBT protection devices BBT, CB BBT, CBof total discrimination of protection devices for allservice Merlin Gerin and Telemecanique

circuit-breaker ranges (1) CBmodification without production downtimes BBT BBTeasily resettable protection device CB CB CB

safety of system coordinated from 40 to 5000 A cascadingand total coordination of protection devices BBT, CB BBT, CB CB

persons and on)load breaking and disconnected coordinatedwith upstream protection devices CB CB CB

equipment testable protection devices CB CB CBpolarized tap off boxes BBT BBT

2.6 Exclusive features and advantagesof the Schneider System

n summarizing table

: exclusive advantage of the Schneider System

BBT : performance owed to the Telemecanique BBTsCB : perfromance due to the Merlin Gerin et Telemecanique circuit-breakersBBT, CB : performance due to the coordination of the Telemecanique BBTs with the

Merlin Gerin circuit-breaker

29

Tab

les

Masterpact, Compact , multi 9 /Canalis KLE, KBA, KBB, KN, KSA en 380 / 415 V ......... p 31Masterpact, Compact /Canalis KVA, KVC, KTA, KTC, KHF en 380 / 415 V ......... p 32Masterpact, Compact /Canalis KSA, KVA, KVC, KTA, KTC, KHF en 660/ 690 V ............. p 34enhanced coordination tablesCompact C amont - 1200 1350 A, 1000 A, 800 A -Compact NS / Canalis KSA, KVA, KVC ....................................... p 39Compact NS amont - 630 160 A -Compact NS, Multi 9 / Canalis KSA, KLE, KBA, KBB ................ p 43

Merlin Gerin circuit-breakersand Telemecanique Canaliscoordination tables

0359

28E

8601

0E04

1624

E

0495

75E

0251

25E

0521

68E

0364

30E

0541

04E

canalis

canalis

5451

1E

5451

2E

0531

92E

30

LV mainswichboard

630 kVA400 V

prospective Isc44 kA


Canalis KSA 63

Canalis KSA

a 30-meter KVA63transmission BBTsystems

630 kVA400 V

D1 Disconnector

D2 Disconnector


c the electrodynamic withstand of thebusbar trunking:The peak current I limited by the circuitbreaker must be less than theelectrodynamic withstand capacity (or ratedpeak current) of the busbar trunking.

Coordination tablesThe tables for coordinating Merlin Gerin

Coordination between Merlin Gerin circuit breakers andTelemecanique Canalis busbar trunking systems

Traditional circuit breakerselection methodThe circuit breaker used to protect adistribution circuit is chosen according to twofundamental criteria:c the maximum load current Ib flowing in thesupply circuit;c the prospective short-circuit current Isc ata point where the circuit breaker is to beinstalled.The circuit breaker is choosen such that:v In circuit breaker u Ib,v breaking capacity of the circuit breakeru Isc.

Installation example Application for Compact NSrange

E396

13E

E407

00E

E407

01E

Ib = 140 A

Ib = 360 A

CB1

CB2

Isc = 65 kA

Isc = 65 kA

CB1 = NS400H(Breakingcapacity = 70 kA)

CB2 = NS160H(Breakingcapacity = 70 kA)

When chosing a circuit breaker to protect abusbar trunking system, it is necessary totake into account:c the usual rules concerning the circuitbreaker current settings:Ib i Ir i Inc whereIb = maximum load currentIr = circuit breaker current settingInc = current rating of the busbar trunking

Multi 9, Compact, Compact CM andMasterpact circuit breakers with respect toTelemecanique Canalis busbar trunking givedirectly, for the different types of trunkingand circuit breakers, the maximum short-circuit current for which the trunking isprotected.

ExampleConsider two 630 kVA/400 V transformer(Usc 4 %) supplying a main LV switchboardfor which the prospective short-circuitcurrent on the busbars is 44 kA.From the switchboard, a 30-metre longCanalis KVA63 transmission busbartrunking system (630A) supplies a CanalisKSA63 trunking system (630A) fordistribution with high-density tap-offs.A tap-off on the KSA63 trunking supplies aCanalis KSA16 trunking system.The short-circuit level are respectively:c 44 kA downstream of circuit-breaker CB1and at the upstream connection of theKVA63 trunking.c 33 kA at the junction between the KVA63transmission trunking and the KSA63trunking for high-density tap-offs.

What circuit breakers should be chosenfor CB1 and CB2 to protect theinstallation against short-circuits ?

CB1 CB2prospective Isc 44 kA 33 kAcircuit breakers NS630N (45 kA breaking NS160N (35 kA breaking

capacity) capacity)Isc protection level for KVA63 45 kAtrunkingIsc protection level for KVA63 45 kAtrunkingIsc protection level for KSA16 35 kAtrunking

31

the different types of Telemecanique busbar trunkingType of busbar trunking Low power Medium power High powerBusbar trunking for transmission KVA 200 to 800 A KTA 1000 to 4000 Aand distribution with low-density KVC 200 to 800 A KTC 1000 to 4000 Atap-offs (380/415 V - 660/690 V) (380/415 V - 660/690 V)Busbar trunking for distribution KN 40 to 100 A KSA 100 to 800 A KHF 1000 to 4500 Awith high-density tap-offs (380/415 V) (380/415 V - 660/690 V) (380/415 V - 660/690 V)Busbar trunking for lighting KLE, KBA, KBBdistribution and management K System

(380/415 V)

type of Canalis busbar trunking KSA-10 KSA-16 KSA-25 KSA-40 KSA-50 KSA-63 KSA-80trunking rating (in A at 35C) 100 160 250 400 500 630 800type of circuit breaker Compact NS100N 25 25Isc max. in kA ms. NS100H 25 70

NS100L 25 90NS160N 20 36 36NS160H 20 70 70NS160L 20 70 150NS250N 17 36 36NS250H 17 55 70NS250L 17 55 150NS400N 30 45 45NS400H 30 45 70NS400L 30 45 150NS630N 30 45 45 45 45NS630H 30 70 70 70 70NS630L 30 150 150 150 150C801N 26 30 40 50C801H 26 30 40 50C801L 30 40 55 80C1001N 40 50C1001H 40 50C1001L 55 80C1251N 50C1251H 50CMN 24 26 32 38

Masterpact M08N1 24 26 32 38M10N1 24 26 32 38M12N1 24 26 32 38M08H1 24 26 32 38M10H1 24 26 32 38M12H1 24 26 32 38M08H2 24 26 32 38M10H2 24 26 32 38M12H2 24 26 32 38M08L1 24 32 40 50M10L1 24 32 40 50M12L1 24 32 40 50

type of Canalis busbar trunking KLE-16/20 KBA-25 KBB-25 KBA-40 KBB-40 KN-04 KN-06 KN-10trunking rating (in A at 35C) 16/20 25 25 40 40 40 63 100type of circuit breaker Multi 9 C60N16/20 10Isc max. in kA ms. C60H16/20 15

C60L16/20 25C60N25 10 10C60H25 15 15C60L25 25 25NC100LH25 50 50C60N40 10 10 10C60H40 15 15 15C60L40 25 25 25NC100LH40 50 50 50C60N63 10C60H63 15C60L63 15NC100LH63 50NS100N (1) 25 25 25NS100H (1) 25 25 25NS100L (1) 25 25 25

(1) TM-D trip unit, rating 40 or 63 or 100 A and STR22SE rating 40 or 100 A

Coordination tables between Merlin Gerin circuit breakers and Telemecanique Canalisbusbar trunkingVoltage : 380/415 V

32

Coordination tables between Merlin Gerin circuit breakersand Telemecanique Canalis busbar trunking systems (cont.)

voltage : 380/415 V

type of Canalis busbar trunking KTA-10 KTA-12 KTA-16 KTA-20 KTA-25 KTA-30 KTA-40trunking rating (in A at 35C) 1000 1200 1600 2000 2500 3000 4000type of circuit breaker Compact C1001N 50 50Isc max. in kA ms. C1001H 55 70

C1001L 100 150C1251N 50 50C1251H 55 70

Masterpact M10N1 40 40 40 40M12N1 40 40 40 40M16N1 40 40 40 40M20N1 55 55 55 55M25N1 55 55 55 55M10H1 40 50 60 65M12H1 40 50 60 65M16H1 40 50 60 65M20H1 60 73 75 75M25H1 60 73 75 75M32H1 75 75 75M40H1 75 75 75M50H1 90M10H2 40 50 60 73M12H2 40 50 60 73M16H2 40 50 60 73M20H2 60 73 80 86M25H2 60 73 80 86M32H2 80 86 90M40H2 80 86 90M50H2 90M10L1 55 85 130M12L1 55 85 130M16L1 65 105 130 130M20L1 65 105 130 130M25L1 65 105 130 130

type of Canalis busbar trunking KVA-20 KVA-31 KVA-40 KVA-50 KVA-63 KVA-80trunking rating (in A at 35C) 200 315 400 500 630 800type of circuit breaker Compact NS250N 35Isc max. in kA ms. NS250H 70

NS250L 100NS400N 35 45 45 45 45NS400H 35 70 70 70 70NS400L 35 150 150 150 150NS630N 45 45 45 45NS630H 70 70 70 70NS630L 150 150 150 150C801N 40 50C801H 40 60C801L 70 110C1001N 40 50C1001H 40 60C1001L 70 110

Masterpact M08N1 33 40M10N1 33 40M08H1 33 40M10H1 33 40M08H2 33 40M10H2 33 40M08L1 40 55M10L1 40 55

type of Canalis busbar trunking KVC-20 KVC-31 KVC-40 KVC-63 KVC-80trunking rating (in A at 35C) 200 315 400 630 800type of circuit breaker Compact NS250N 35Isc max. in kA ms. NS250H 70

NS250L 100NS400N 35 45 45 45NS400H 35 70 70 70NS400L 35 150 150 150NS630N 45 45 45NS630H 70 70 70NS630L 150 150 150C801N 40 50C801H 40 60C801L 70 110C1001N 40 50C1001H 40 60C1001L 70 110


33

voltage : 380/415 Vtype of Canalis busbar trunking KTC-10 KTC-13 KTC-16 KTC-20 KTC-25 KTC-30 KTC-40 KTC-50trunking rating (in A at 35C) 1000 1350 1600 2000 2500 3000 4000 5000type of circuit breaker Compact C1001N 50 50Isc max. in kA ms. C1001H 55 70

C1001L 100 150C1251N 50 50C1251H 55 70

Masterpact M10N1 40 40 40 40M12N1 40 40 40 40M16N1 40 40 40 40M20N1 55 55 55 55M25N1 55 55 55 55M10H1 40 50 60 65M12H1 40 50 60 65M16H1 40 50 60 65M20H1 60 73 75 75M25H1 60 73 75 75M32H1 75 75 75M40H1 75 75 75M50H1 90 95M63H1 90 95M10H2 40 50 60 73M12H2 40 50 60 73M16H2 40 50 60 73M20H2 60 73 82 82M25H2 60 73 82 82M32H2 82 82 90M40H2 82 82 90M50H2 90 95M63H2 90 95M10L1 55 85 130M12L1 55 85 130M16L1 65 105 130 130 130M20L1 65 105 130 130 130M25L1 65 105 130 130 130

type of Canalis busbar trunking KHF KHF KHF KHF KHFtrunking rating (in A at 35C) 1000 1200/1450 2200/2500 3000/3400 4000/4500type of circuit breaker Compact C801N 28Isc max. in kA ms. C801H 28

C801L 45C1001N 28 50C1001H 28 50C1001L 45 80C1251N 28 50C1251H 28 50CMN 28 38 70 70CMH 28 38 85 85

Masterpact M08N1 28 38M10N1 28 38M12N1 28 38M16N1 28 38 40M20N1 28 38 55 55M25N1 28 38 55 55M08H1 28 38M10H1 28 38M12H1 28 38M16H1 28 38 65M20H1 28 38 75 75M25H1 28 38 75 75M32H1 75 75 75M40H1 75 75 75M50H1 90 100 100M63H1 90 100 100M08H2 28 38M10H2 28 38M12H2 28 38M16H2 28 38 90M20H2 28 38 90 100M25H2 28 38 90 100M32H2 28 38 90 100 100M40H2 90 100 100M50H2 90 120 125M63H2 90 120 125M08L1 35 50M10L1 35 50M12L1 35 50M16L1 28 42 130M20L1 28 42 130 130M25L1 28 42 130 130

34

voltage: 660/690 Vtype of Canalis busbar trunking KSA-10 KSA-16 KSA-25 KSA-40 KSA-50 KSA-63 KSA-80trunking rating (in A at 35C) 100 160 250 400 500 630 800type of circuit breaker Compact NS100N 8 8Isc max. in kA ms. NS100H 10 10

NS100L 20 75NS160N 8 8 8NS160H 10 10 10NS160L 20 75 75NS250N 8 8 8NS250H 10 10 10NS250L 15 20 20NS400N 10 10 10NS400H 17 20 20NS400L 14 28 35NS630N 10 10 10 20NS630H 20 20 20 20NS630L 35 35 35 35C801N 25 25 25 25C801H 26 29 35 40C801L 26 30 45 60C1001N 25 25C1001H 35 40C1001L 45 60C1251N 25C1251H 40CMN 24 26 32 38

Masterpact M08N1 24 26 32 38M10N1 24 26 32 38M12N1 24 26 32 38M08H1 24 26 32 38M10H1 24 26 32 38M12H1 24 26 32 38M08H2 24 26 32 38M10H2 24 26 32 38M12H2 24 26 32 38M08L1 24 26 32 38M10L1 24 26 32 38M12L1 24 26 32 38

type of Canalis busbar trunking KVA-20 KVA-31 KVA-40 KVA-50 KVA-63 KVA-80trunking rating (in A at 35C) 200 315 400 500 630 800type of circuit breaker Compact NS250N 8Isc max. in kA ms. NS250H 10

NS250L 20NS400N 10 10 10 10 10NS400H 20 20 20 20 20NS400L 20 75 75 75 75NS630N 10 10 10 10NS630H 20 20 20 20NS630L 35 35 35 35C801N 33 25C801H 33 40C801L 50 60C1001N 33 25C1001H 33 40C1001L 50 60



35

voltage: 660/690 Vtype of Canalis busbar trunking KVC-20 KVC-31 KVC-40 KVC-63 KVC-80trunking rating (in A at 35C) 200 315 400 630 800type of circuit breaker Compact NS250N 8Isc max. in kA ms. NS250H 10

NS250L 20NS400N 10 10 10 10NS400H 20 20 20 20NS400L 20 75 75 75NS630N 10 10 10NS630H 20 20 20NS630L 35 35 35C801N 25 25C801H 36 40C801L 60 60C1001N 25 25C1001H 36 40C1001L 60 60


type of Canalis busbar trunking KTA-10 KTA-12 KTA-16 KTA-20 KTA-25 KTA-30 KTA-40trunking rating (in A at 35C) 1000 1200 1600 2000 2500 3000 4000type of circuit breaker Compact C1001N 25 25Icc maxi en kA eff. C1001H 40 40

C1001L 60 60C1251N 25 25C1251H 40 40

Masterpact M10N1 40 40 40 40M12N1 40 40 40 40M16N1 40 40 40 40M20N1 40 40 40 55M25N1 40 40 40 55M10H1 40 50 60 65M12H1 40 50 60 65M16H1 40 50 60 65M20H1 60 65 65 75M25H1 60 65 65 75M32H1 75 75 75M40H1 75 75 75M50H1 85M10H2 40 50 60 73M12H2 40 50 60 73M16H2 40 50 60 73M20H2 60 73 80 85M25H2 60 73 80 85M32H2 80 85 85M40H2 80 85 85M50H2 85M10L1 40 50 65M12L1 40 50 65M16L1 50 65 65 65M20L1 50 65 65 65M25L1 50 65 65 65

36

voltage: 660/690 Vtype of Canalis busbar trunking KTC-10 KTC-13 KTC-16 KTC-20 KTC-25 KTC-30 KTC-40 KTC-50trunking rating (in A at 35 C) 1000 1350 1600 2000 2500 3000 4000 5000type of circuit breaker Compact C1001N 25 25Isc max. in kA ms. C1001H 40 40

C1001L 60 60C1251N 25 25C1251H 40 40

Masterpact M10N1 40 40 40 40M12N1 40 40 40 40M16N1 40 40 40 40M20N1 40 40 40 55M25N1 40 40 40 55M10H1 40 50 60 65M12H1 40 50 60 65M16H1 40 50 60 65M20H1 60 65 65 75M25H1 60 65 65 75M32H1 75 75 75M40H1 75 75 75M50H1 85 85M63H1 85 85M10H2 40 50 60 73M12H2 40 50 60 73M16H2 40 50 60 73M20H2 60 73 80 82M25H2 60 73 80 82M32H2 80 82 85M40H2 80 82 85M50H2 85 85M63H2 85 85M10L1 55 65 65M12L1 55 65 65M16L1 50 65 65 65M20L1 50 65 65 65M25L1 50 65 65 65

type of Canalis busbar trunking KHF KHF KHF KHF KHFtrunking rating (in A at 35 C) 1000 1200/1450 2200/2500 3000/3400 4000/4500type of circuit breaker Compact C801N 28Isc max. in kA ms. C801H 28

C801L 45C1001N 28 28C1001H 28 40C1001L 30 60C1251N 28 28C1251H 28 40CMN 28 38 50 50CMH 28 38 50 50

Masterpact M08N1 28 38M10N1 28 38M12N1 28 38M16N1 28 38M20N1 28 38M25N1 28 38M08H1 28 38M10H1 28 38M12H1 28 38M16H1 28 38 65M20H1 28 38 75 75M25H1 28 38 75 75M32H1 75 75 75M40H1 75 75 75M50H1 85 85 85M63H1 85 85 85M08H2 28 38M10H2 28 38M12H2 28 38M16H2 28 38 85M20H2 28 38 85 85M25H2 28 38 85 85M32H2 28 38 85 85 85M40H2 85 85 85M50H2 85 85 85M63H2 85 85 85M08L1 28 38M10L1 28 38M12L1 28 38M16L1 28 38 65M20L1 28 38 65 65M25L1 28 38 65 65


37

Coordination between circuit breakers and TelemecaniqueCanalis busbar trunking systemsCascading and reinforced discrimination

CascadingThe use of a current-limiting circuit breakerupstream to reinforce the breaking capacityof a downstream circuit breaker.

PrincipleCascading

Application for Compact NS rangeCascading

DiscriminationIn the event of an electrical fault on oneoutgoing circuit, discrimination is the abilityof the electrical installation to maintain thecontinuity of electrical power supplied to theother circuits not concerned by the fault.As a general rule, cascading anddiscrimination techniques are appliedindependently.Schneider has developed an exclusivesystem to conciliate cascading anddiscrimination.This system ensures discrimination up to thereinforced breaking capacity of theassociation of circuit breakers CB1 and CB2.

PrincipleCascading and reinforced discrimination

Application for Compact NS rangeCascading and reinforced discrimination

E407

02E

E407

03E

E407

04E

E407

02E

CB2 breaking capacity

CB2 breaking capacity Discrimination ensured up to the reinforcedbreaking capacity of CB2

Circuit breaker selection takingcoordination into account

The use of current-limiting circuit breakersmakes it possible to implement coordinationtechniques. This improves circuit breakerperformance in terms of breaking capacityand continuity of service.

Coordination techniques are described andrecognised by the following standards:c product standards IEC 947-1 and 947-2;c installation standards IEC 364,NF C15-100, etc.

CB2

CB1

Isc = 65 kA

CB2

CB1

Isc = 65 kA

CB2 = NS160N(Breakingcap. = 35 kA)

CB1 = NS400H

Renforcedbreak. cap.70 kA

CB2 = NS160NIsc = 65 kA

CB1 = NS400H

Break. cap. +discriminationreinforced 70 kA

38

Cascading, reinforced discrimination andreinforced protection of busbar trunkingsystems (BTS)This technique is the direct application ofcascading and discrimination techniques tothe protection of busbar trunking systems.For various upstream circuit breakers andupstream busbar trunking systems, thetables below give directly:c the level of short-circuit protection of thebusbar trunking;c the downstream circuit breaker andassociated busbar trunking;c the cascading breaking capacity of thedownstream circuit breaker;c the level of reinforced discrimination of theupstream and downstream circuit breakers;c the level of reinforced protection of thedownstream busbar trunking.

Source

Example of a table corresponding to theabove diagram.

CB2 = NS160N

KSA16 (160 A)

70 kA

KSA40 (400 A)

CB1 = NS400HE40

705E

Application to a Canalis distributeddistribution system:c reinforcement of the breaking capacity ofthe NS 160N (CB2) up to 70 kA;

c discrimination between CB1 and CB2ensured up to 70 kA;c protection of Canalis KSA 16 busbartrunking up to 70 kA.

Coordination between Merlin Gerin circuit breakers andTelemecanique Canalis busbar trunking systemsCascading and reinforced discrimination (cont.)

rated current of the upstream busbar trunking: 315 and 400 AUpstream circuit breaker NS400N NS400H NS400LAssociated trip unit STR23SE/STR53UE STR23SE/STR53UE STR23SE/STR53UEUpstream busbar trunking KSA / KVA / KVC KSA / KVA / KVC KSA / KVA / KVC

315 and 400 A 315 and 400 A 315 and 400 ALevel of protection of the 45 70 150upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS100N NS160N NS100H NS160HAssociated trip unit TMD/STR22SE TMD/STR22SE TMD/STR22SEDownstream busbar trunking KSA KSA KSA KSA KSA KSA

100 A 160 A 100 A 160 A 100 A 160 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 45 45 70 70 150 150Reinforced breaking capacityof the downstream circuitbreaker (kA) 45 45 70 70 150 150Reinforced protection ofthe downstream busbartrunking (kA) 45 45 70 70 25 70

NS400HSTR23SE/STR53UEKSA / KVA / KVC315 and 400 A70

NS100N NS160NKSA KSA100 A 160 A

70 70

70 70

70 70

39

voltage: 380/415 V

E396

14E

upstreamcircuit-breaker

source

level of protectionof the upstreambusbar trunking

reinforced cascadingand discriminationbetween the 2 circuit-breakers

upstream busbarcanalisation

downstreamcircuit-breaker

downstreambusbar trunking

reinforced protectionof the downstreambusbar trunking

rated current of the upstream busbar trunking: 1200 and 1350 AUpstream circuit breaker C1251N C1251NAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KTA-12 / KTC-13 KTA-12 / KTC-13

1200 and 1350 A 1200 and 1350 ALevel of protection of the 50 50upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS250N NS400N NS630N NS100N NS160N NS250N NS400N NS630NAssociated trip unit TMD / STR22SE STR23SE / STR53UE TMD / STR22SE STR23SE / STR53UEDownstream busbar trunking KSA KSA KSA KSA / KVA / KVC KSA KSA KSA KSA / KVA / KVC

100 A 160 A 250 A 315 - 400 A 500 - 630 A 100 A 160 A 250 A 315 - 400 A 500 - 630 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 50 50 50 45 40 50 50 50 50 50Reinforced breaking capacityof the downstreamcircuit breaker (kA) 50 50 50 50 50 50 50 50 50 50Reinforced protection of thedownstream busbar trunking(kA) 25 50 50 50 50 25 50 50 50 50

Upstream circuit breaker C1251N C1251NAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KTA-12 / KTC-13 KTA-12 / KTC-13

1200 and 1350 A 1200 and 1350 ALevel of protection of the 50 50upstream busbar trunking (kA)Downstream circuit breaker NS100N TMD / STR22SE NS100N TMD / STR22SEAssociated trip unit 40 A 63 A 100 A 40 A 63 A 100 ADownstream busbar trunking KN KN KN KN KN KN

40 A 63 A 100 A 40 A 63 A 100 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 50 50 50 50 50 50Reinforced breaking capacityof the downstreamcircuit breaker (kA) 50 50 50 50 50 50Reinforced protection of thedownstream busbar trunking(kA) 50 50 50 50 50 50

Coordination tables between Merlin Gerin circuit breakersand Telemecanique Canalis busbar trunking systemsCascading and reinforced discrimination

40

rated current of the upstream busbar trunking: 1200 and 1350 A (cont.)Upstream circuit breaker C1251H C1251HAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KTA-12 / KTC-13 KTA-12 / KTC-13

1200 and 1350 A 1200 and 1350 ALevel of protection of the 70 70upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS250N NS400N NS630N NS100N NS160N NS250N NS400N NS630NAssociated trip unit TMD / STR22SE STR23SE / STR53UE TMD / STR22SE STR23SE / STR53UEDownstream busbar trunking KSA KSA KSA KSA / KVA / KVC KSA KSA KSA KSA / KVA / KVC


Upstream circuit breaker C1251H C1251HAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KTA-12 / KTC-13 KTA-12 / KTC-13

1200 and 1350 A 1200 and 1350 ALevel of protection of the 70 70upstream busbar trunking (kA)Downstream circuit breaker NS100N TMD / STR22SE NS100N TMD / STR22SEAssociated trip unit 40 A 63 A 100 A 40 A 63 A 100 ADownstream busbar trunking KN KN KN KN KN KN



41

rated current of the upstream busbar trunking: 1000 AUpstream circuit breaker C1001N C1001NAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KTA-10 / KTC-10 KTA-10 / KTC-10

1000 A 1000 ALevel of protection of the 50 50upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS250N NS400N NS630N NS100N NS160N NS250N NS400N NS630NAssociated trip unit TMD / STR22SE STR23SE / STR53UE TMD / STR22SE STR23SE / STR53UEDownstream busbar trunking KSA KSA KSA KSA / KVA / KVC KSA KSA KSA KSA / KVA / KVC


Upstream circuit breaker C1001N C1001NAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KTA-10 / KTC-10 KTA-10 / KTC-10

1000 A 1000 ALevel of protection of the 50 50upstream busbar trunking (kA)Downstream circuit breaker NS100N TMD / STR22SE NS100N TMD / STR22SEAssociated trip unit 40 A 63 A 100 A 40 A 63 A 100 ADownstream busbar trunking KN KN KN KN KN KN


Upstream circuit breaker C1001H C1001HAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KTA-10 / KTC-10 KTA-10 / KTC-10

1000 A 1000 ALevel of protection of the 55 55upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS250N NS400N NS630N NS100N NS160N NS250N NS400N NS630NAssociated trip unit TMD / STR22SE STR23SE / STR53UE TMD / STR22SE STR23SE / STR53UEDownstream busbar trunking KSA KSA KSA KSA / KVA / KVC KSA KSA KSA KSA / KVA / KVC


Upstream circuit breaker C1001H C1001HAssociated trip unit STR35SE / STR55UE STR45UEUpstream busbar trunking KTA-10 / KTC-10 KTA-10 / KTC-10



42

rated current of the upstream busbar trunking: 800 AUpstream circuit breaker C801N C801NAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KVA-80 / KVC-80 KVA-80 / KVC-80

800 A 800 ALevel of protection of the 50 50upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS250N NS400N NS100N NS160N NS250N NS400NAssociated trip unit TMD / STR22SE STR23SE / STR53UE TMD / STR22SE STR23SE / STR53UEDownstream busbar trunking KSA KSA KSA KSA / KVA / KVC KSA KSA KSA KSA / KVA / KVC

100 A 160 A 250 A 315 - 400 A 100 A 160 A 250 A 315 - 400 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 50 50 50 35 50 50 50 35Reinforced breaking capacityof the downstreamcircuit breaker (kA) 50 50 50 50 50 50 50 50Reinforced protection of thedownstream busbar trunking(kA) 50 50 50 50 50 50 50 50

Upstream circuit breaker C801N C801NAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KVA-80 / KVC-80 KVA-80 / KVC-80



Upstream circuit breaker C801H C801HAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KVA-80 / KVC-80 KVA-80 / KVC-80

800 A 800 ALevel of protection of the 60 60upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS250N NS400N NS100N NS160N NS250N NS400NAssociated trip unit TMD / STR22SE STR23SE / STR53UE TMD / STR22SE STR23SE / STR53UEDownstream busbar trunking KSA KSA KSA KSA / KVA / KVC KSA KSA KSA KSA / KVA / KVC

100 A 160 A 250 A 315 - 400 A 100 A 160 A 250 A 315 - 400 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 70 70 70 35 70 70 70 35Reinforced breaking capacityof the downstreamcircuit breaker (kA) 70 70 70 70 70 70 70 70Reinforced protection of thedownstream busbar trunking(kA) 60 60 60 60 60 60 60 60

Upstream circuit breaker C801H C801HAssociated trip unit STR35SE / STR55UE STR45AEUpstream busbar trunking KVA-80 / KVC-80 KVA-80 / KVC-80




43

rated current of the upstream busbar trunking: 500 and 630 AUpstream circuit breaker NS630N NS630H NS630LAssociated trip unit STR23SE/STR53UE STR23SE/STR53UE STR23SE/STR53UEUpstream busbar trunking KSA / KVA / KVC KSA / KVA / KVC KSA / KVA / KVC

500 and 630 A 500 and 630 A 500 and 630 ALevel of protection of the 45 70 150upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS250N NS100N NS160N NS250N NS100H NS160H NS250HAssociated trip unit TMD / STR22SE TMD / STR22SE TMD / STR22SEDownstream busbar trunking KSA KSA KSA KSA KSA KSA KSA KSA KSA

100 A 160 A 250 A 100 A 160 A 250 A 100 A 160 A 250 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 45 45 45 70 70 70 150 150 150Reinforced breaking capacity ofthe downstream circuit breaker (kA) 45 45 45 70 70 70 150 150 150Reinforced protection of thedownstream busbar trunking(kA) 45 45 45 70 70 70 70 70 70

Upstream circuit breaker NS630N NS630H NS630LAssociated trip unit STR23SE/STR53UE STR23SE/STR53UE STR23SE/STR53UEUpstream busbar trunking KSA / KVA / KVC KSA / KVA / KVC KSA / KVA / KVC

500 and 630 A 500 and 630 A 500 and 630 ALevel of protection of the 45 70 150upstream busbar trunking (kA)Downstream circuit breaker NS100N TMD / STR22SE NS100N TMD / STR22SE NS100N TMD / STR22SEAssociated trip unit 40 A 63 A 100 A 40 A 63 A 100 A 40 A 63 A 100 ADownstream busbar trunking KN KN KN KN KN KN KN KN KN



315 and 400 A 315 and 400 A 315 and 400 ALevel of protection of the 45 70 150upstream busbar trunking (kA)Downstream circuit breaker NS100N NS160N NS100N NS160N NS100H NS160HAssociated trip unit TMD / STR22SE TMD / STR22SE TMD / STR22SEDownstream busbar trunking KSA KSA KSA KSA KSA KSA

100 A 160 A 100 A 160 A 100 A 160 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 45 45 70 70 150 150Reinforced breaking capacity ofthe downstream circuit breaker (kA) 45 45 70 70 150 150Reinforced protection of thedownstream busbar trunking(kA) 45 45 70 70 70 70




rated current of the upstream busbar trunking: 315 and 400 A

44

rated current of the upstream busbar trunking: 200 and 250 AUpstream circuit breaker NS250N NS250H NS250LAssociated trip unit TMD / STR22SE TMD / STR22SE TMD / STR22SEUpstream busbar trunking KSA / KVA / KVC KSA / KVA / KVC KSA / KVA / KVC

200 and 250 A 200 and 250 A 200 and 250 ALevel of protection of the 36 70 150upstream busbar trunking (kA)Downstream circuit breaker NS100N NS100N NS100HAssociated trip unit TMD / STR22SE TMD / STR22SE TMD / STR22SEDownstream busbar trunking KSA-10 KSA-10 KSA-10

100 A 100 A 100 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 36 36 36Reinforced breaking capacityof the downstreamcircuit breaker (kA) 36 70 150Reinforced protection of thedownstream busbar trunking(kA) 36 70 70

Upstream circuit breaker NS250N NS250H NS250LAssociated trip unit TMD / STR22SE TMD / STR22SE TMD / STR22SEUpstream busbar trunking KSA / KVA / KVC KSA / KVA / KVC KSA / KVA / KVC


40 A 63 A 100 A 40 A 63 A 100 A 40 A 63 A 100 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 36 36 36 36 36 36 36 36 36Reinforced breaking capacityof the downstreamcircuit breaker (kA) 36 36 36 70 70 70 150 150 150Reinforced protection of thedownstream busbar trunking(kA) 36 36 36 50 50 50 50 50 50

Upstream circuit breaker NS250N NS250HAssociated trip unit TMD / STR22SE TMD / STR22SEUpstream busbar trunking KSA / KVA / KVC KSA / KVA / KVC

200 and 250 A 200 and 250 ALevel of protection of the 36 70upstream busbar trunking (kA)Downstream circuit breaker C60N C60N NC100L C60H C60H NC100L NC100LHAssociated trip unit (rating A) 16 25/40 25/40 16 25/40 25/40 25/40Downstream busbar trunking KLE KBA / KBB KBA / KBB KLE KBA / KBB KBA / KBB KBA / KBB

16 A 25 - 40 A 25 - 40 A 16 A 25 - 40 A 25 - 40 A 25 - 40 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 25 25 36 40 40 50 70Reinforced breaking capacityof the downstreamcircuit breaker (kA) 25 25 36 40 40 50 70Reinforced protection of thedownstream busbar trunking(kA) 25 25 36 40 40 50 50

Upstream circuit breaker NS250N NS250HAssociated trip unit TMD / STR22SE TMD / STR22SEUpstream busbar trunking KSA / KVA / KVC KSA / KVA / KVC

200 and 250 A 200 and 250 ALevel of protection of the 36 70upstream busbar trunking (kA)Downstream circuit breaker C60N C60N NC100L NC100L C60H C60H NC100L NC100L NC100LH NC100LHAssociated trip unit 40 A 63 A 40 A 63 A 40 A 63 A 40 A 63 A 40 A 63 ADownstream busbar trunking KN KN KN KN KN KN KN KN KN KN

40 A 63 A 40 A 63 A 40 A 63 A 40 A 63 A 40 A 63 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 25 25 36 36 40 30 50 50 70 70Reinforced breaking capacityof the downstreamcircuit breaker (kA) 25 25 36 36 40 30 50 50 70 70Reinforced protection of thedownstream busbar trunking(kA) 25 25 36 36 40 30 50 50 50 50

Coordination tables between Merlin Gerin circuit breakersand Telemecanique Canalis busbar trunking systemsCascading and reinforced discrimination (cont.)

45

rated current of the upstream busbar trunking: 160 AUpstream circuit breaker NS160N NS160HAssociated trip unit TMD / STR22SE TMD / STR22SEUpstream busbar trunking KSA KSA

160 A 160 ALevel of protection of the 36 70upstream busbar trunking (kA)Downstream circuit breaker C60N C60N NC100L C60H C60H NC100L NC100LHAssociated trip unit (rating A) 16 25/40 25/40 16 25/40 25/40 25/40Downstream busbar trunking KLE KBA / KBB KBA / KBB KLE KBA / KBB KBA / KBB KBA / KBB

16 A 25 - 40 A 25 - 40A 16 A 25 - 40 A 25 - 40 A 25 - 40 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 25 25 36 40 40 50 70Reinforced breaking capacityof the downstreamcircuit breaker (kA) 25 25 36 40 40 50 70Reinforced protection of thedownstream busbar trunking(kA) 25 25 36 40 40 50 50

Upstream circuit breaker NS160N NS160HAssociated trip unit TMD / STR22SE TMD / STR22SEUpstream busbar trunking KSA KSA

160 A 160 ALevel of protection of the 36 70upstream busbar trunking (kA)Downstream circuit breaker C60N C60N NC100L NC100L C60H C60H NC100L NC100L NC100LH NC100LHAssociated trip unit 40 A 63 A 40 A 63 A 40 A 63 A 40 A 63 A 40 A 63 ADownstream busbar trunking KN KN KN KN KN KN KN KN KN KN

40 A 63 A 40 A 63 A 40 A 63 A 40 A 63 A 40 A 63 ADiscrimination limit betweenupstream and downstreamcircuit breakers (kA) 25 25 36 36 40 40 50 50 70 70Reinforced breaking capacityof the downstreamcircuit breaker (kA) 25 25 36 36 40 40 50 50 70 70Reinforced protection of thedownstream busbar trunking(kA) 25 25 36 36 40 40 50 50 50 50

As standards, specifications and designs change from time to time, please ask for confirmation of the information given in this publication.

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final distribution

lv busbar distribution

schneider system

enhanced bbt protection

overload protection

exclusive features

level b

level c