GEH-2038AGEH- 2038

INSTRUCTIONSSUPERSEDES

CONTROL AND TRANSFER SWITCH

Type SBM

L O W V O L T A G E S W I T C H G E A R D E P A R T M E N T

GENERAL 01ELECTRICP H I L A D E L P H I A , P A .

N.

otoHa

itooCO00

oopzoFrontsupportSI. gft aI HFront

bearingSpringoctuofor

*-<§w

PositioningwheelTorsion

springUsed for switches with spring-rstam action

Bearing *-+*Sleeve 0)

Barrierassembly

Rear

SfbeoringPositioning HPopiTarget

escutcheonRocker

Barrier 3a>A

Upperstotionory

contactWTerminalNomepbte w\ sTerminal

screw"Handle

/eMounting

LowerstationaryBorrier cover

contoctCams forcontocts

Cam follower andmoving contoct

assembly

Fig. I Exploded View of Type SBM Switch

Cover (8027024)Fig. I (8913283 )A -1_ .~+—C-+ a

CONTROL AND TRANSFER SWITCHTYPE SBMDESCRIPTION

Some applications, particularly of momentarycontact switches, which have a torsion spring toreturn the switch to a central-neutral position,require a contact action which lags behind theswitch motion (lost motion or slip contacts). Suchcontacts use cams with a special loose fit on theshaft. When the shaft has turned far enough tc closeor open these contacts, it can be rotated 45 degreesin the reverse direction without moving the cams,but beyond this point, the cam moves with the shaftand the contacts either open or close as the casemay be.

INTRODUCTIONThe Type SBM switches are cam operateddevices having two mechanically and electricallyseparate contacts per stage. The switch is totallyenclosed, having no cover. The contact terminalsare brought out to the corners, allowing screwconnections to be made over a large angle. Theswitch is so constructed so as to allow the additionof 1 or 2 extra stages to the switch with a minimumof effort.

APPLICATIONMomentary contact switches have a torsionspring that returns the switch to acentralor neutralposition when the handle is released after operationto a side position or positions. This torsion springis designed for maximum of 90 degrees operationto each side of the central position. The torsionspring may have one end cut off or tied back in sucha manner as to be effective on one side of thecentral position only. That is, the switch may havemomentary contact to one side of the centralpositionand maintaining contacts to the other side.In some momentary contact (spring return)switches, a locking device is provided by whichthe shaft may be held against the action of thetorsion spring by pulling out the handle when theswitch is turned to one of the side positions.

The Type SBM switches are intended primarilyfor the control of electrically operated devices suchas circuit breakers, small motors and magneticswitches, and for the transfer of meters, instrumentsand relays.OPERATION

The Type SBM switches are rotary cam operatedswitches. Rotation of the shaft causes contacts toopen or close, depending upon the shape and settingof the cams. Each stage consists of two mechanicallyand electrically separate contacts. This is ac-complished by means of two cams and two camfollowers, assembled with moving contacts.Each cam is constructed so as to have twooperating surfaces. These surfaces operate on thecam follower. The cam follower has two tips whichare located in offset horizontal planes lining upwith the two cam operating surfaces. Thus, as thecam is rotated, one surface operates against theclosing cam follower tip, while the opening camfollower tip is relieved. Both cam follower tipsare always in contact with the cam surfaces. Thisallows for a positive closing and opening action notdependent upon springs.Each cam follower has a spring loaded movingcontact assembled to it. The compression springacts to give adequate contact pressure when a con-tact is closed. The moving contact is held to thecam follower by a pin passing through a hole in thecam follower and angled slot in the moving contact.As the contacts close, the moving contact slidesalong this slot while compressing the spring thuscausing relative motion or ’’wipe” between movingand stationary contacts.

POSITIONING

A detent wheel, mounted on the square shaft andacted upon by a spring loaded roller arm, givespositive positioning action to the switch.REMOVABLE HANDLES

The removable handle option may be obtainedwith up to 3 keyways in the escutcheon. The keywaylocations are at the discretion of the customer. Thehandle is removable in one position. Any stylehandle can be used for this operation.ADD-A-STAGE

A shaft extension is provided to enable anadditional stage to be coupled to the existing switchin the event that more contacts are required whenthe switch is in the hands of the customer.These instructions do not purport to cover all details or variations in equipment nor to provide for every possiblecontingency to be met in connection with installation, operation or maintenance. Should further information be desiredor should particular problems arise which are not covered sufficiently for the purchaser’s purposes, the matter shouldbe referred to the General Electric Company.

3

GEH-2038 Control and Transfer Switch Type SBM

The complete stack is tied together with twotie bolts threaded into the front support. These tiebolts also act as a bearing for the cam followersin each stage. Each stage consists of four stationarycontacts and two moving contacts, (double breakconstruction) two cams and two cam followers.The cams are mounted on the operating shaft. Incase only one contact is required in a stage, acam follower assembly is omitted.

RATINGSThe switch is rated for a mechanical life of

500,000 operations. The electrical rating is 600volts, 20 amperes continuous. The interruptingrating depends on several factors; namely, voltage,current and inductance of the circuit. It may benecessary to use two or more contacts in seriesto insure adequate interrupting ability on highlyinductive circuits. The interrupting ratings areshown in Table I.

4

CONTACT IDENTIFICATION

The contacts are marked for identificationusing a standard system. On each side of the switchmidway on the barriers, is a confined marking strip.These strips are located between the two screwswhich define a contact. The marking strip on theright side, front view, looking toward the rear isnumbered 1, 3, 5, etc. starting at the panel end.Those on the left side are marked 2, 4, 6, etc.If a contact is omitted the terminal screws are alsoomitted for that contact.

TABLE IInductive CircuitNon-Inductive Cir.

CircuitVoltage

Number of Contacts2(in ser)2(in ser) 11

25.030.0 8.024 DC48 DC

125 DC250 DC600 DC115 AC230 AC460 AC600 AC

10.06.0 18.025.08.0

10.015.0 4.05.02.53.0 1.01.00.70.30.80.4

50.024.075.040.025.012.050.025.0 ENCLOSURES AND MOUNTING15.025.0 5.012.0

20.0 12.08.010.0 The basic switch is totally enclosed except foran opening in the bottom to allow for a visual in-spection of the contacts.

All switches are furnished for mounting inpanels 3/32 to 1/4 inch thick. Variation in panelthickness is taken up by the use of two saddlewashers mounted between the handle and escutcheon.

CONSTRUCTIONThe Type SBM switch is built up with a series

of stages which are nested into each other, anoperating shaft, a front support and a rear support.

INSTALLATIONRECEIVING provided in the panel as shown in Fig. 2.

To mount a switch on a panel, first removethe handle and escutcheion, including where pro-vided, the position-indicating pointer and the curvedspring washers (saddle spring). Next, hold theswitch in place on the back of the panel and insertthe mounting screws through the escutcheon, panel,and spacers (if used) into the switch front support,but do not tighten the mounting screws. Attach thepointer, saddle springs and handle. Align theescutcheon on the panel.

When mounting removable-handle switches becertain that the shaft of the switch is properlypositioned, so the handle is easily removed beforethe mounting screws are tightened.

Immediately upon receipt of a switch, examineit for any damage sustained in transit. If injury orrough handling is evident, file a damage claim atonce with the transportation company and promptlynotify the nearest General Electric Apparatus SalesOffice.and packed in individual cartons before shipment.

If the switches are for stock purposes or notfor immediate installation, they should be left in theshipping carton and stored in a clean dry location.

The switches are completely assembled

0MOUNTINGFor panel mounted switches, holes should be

MAINTENANCEcoated with sulphide, they should be cleaned witha flexible burnishing tool similar to that includedin the XRT relay tool kit.REPAIR AND REPLACEMENT

In some cases, it is desirable to either replacea contact stage or to add an additional amount ofcontacts.

SERVICINGCONTACT CLEANING

At regular intervals, the switch contacts shouldbe inspected for wear and burning. An opening atthe bottom of the switch has been provided for this.(See Fig. 3) If the contacts are slightly pitted or

4

Control and Transfer Switch Type SBM GEH-2038

SHAFT EXTENSION FOR1 TO 8 STAGE SWITCHES

ONLY.HANDLES PANEL * Ii 15

16f 2k HIGHV24 WIDEPISTOL 16

ill GRIPr imB WEN PANEL IS

* 1" THICK - ADD1/ 2" TC A A B

-2_216— " A"* DIM.STANDARD

SWITCHREMOVABLEHANDLE SW.PULL TO LOCK

SWITCHNO. OFSTAGES

PT.PT. " A" B " A " B PT B" A"£ 21 4-9/ 161 1 3-7/8 41 4-3/ 4

1 / OVAL 22 5-3/162 4-1/22 42 5-3/823 5-13/163 3 5-1/8 43 6

2£ 4 5-3/4 24 6-7/104 6-5/84416 1 25 7-1/165 6-3/85 7-1/4 5045

26 7-11/16 ®co6 76 46 7-7/8I r-1 CT\27 8-5/16ICN7-5 /87 7 47 8-1/ 2CM

il 28 3-15/1688 8-1/4 48 9-1/88(O

1o> 29 9-3/16 9-1/49 9 498-1/2

fcKNURLEDto

106—1/810 13/1610 3C 5004

5 1/ 2 HOLE-STD. & PULL TO LOCK1-3/8 HOLE-REMOVABLE HANDLE

PANEL DRILLING

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OlU- Pi "*s« M1 11LEVER

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11 eg* 1

i 115 15 15 1516 * 16 ~ "*”16 16

44228 X 1/8 THICK

LAMINATED PHOTO LITHOESCUTCHEON

THICKSTANDARD

ESCUTCHEON

Outline and Panel Dri 11 ing of Type SBM SwitchFig. 2

5

GEH-2038 Control and Transfer Switch Type SBM

COCMOr̂ -CMO00

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Li-

Fig. 3 Bottom View of Type SBM Switch

CMCMO

CMO0O

=*cnu.

Fig. 4 View of Type SBM Switch with Additional Stage in Position

In such cases, it might be advantageous not todisturb the existing switch but to add directly tothe present switch. In order to do this, the propercontact sequence should be ordered (no more thantwo stages) noting that this is for addingtoan existingswitch. These parts will be received assembledwith a U-shaped bracked and a coupling with asquare hole will also be received. Fig. 4 shows aType SBM switch with an additional stage already inposition.

cause the side holes in the two U-shaped bracketsto line up. Fasten the brackets together with thehardware supplied.

If it is desired to disassemble the switch forany reason, the following procedure should befollowed: Place an identifying mark on the handleend of shaft corresponding to a position on theescutcheon such as 12 O’clock. Remove theescutcheon. Remove the three screws fastening thefront plate to the front support. If there are stopsin the front support, the position relative to theshaft identification mark should be noted. Removethe stops, spacer and star wheel if they are present.

To install these additional contacts, loosenthe two tie bolts at the rear of the switch about3/32 inch. Slide the loose bracket over the shaftand tie bolts so that the inner part of the bracketslot rests on the tie bolts between the tie boltsand nameplate. Tighten the tie bolts. Slide thecoupling over the shaft extension on the presentswitch, then slide the shaft extension on the newbarrier assembly into the coupling, keeping theshaft of the new contact barriers in the properposition to give the correct contact sequence cor-responding to the handle position. This should

/Unscrew the tie bolts and remove the front

support. If any torsion springs are present, pullone tie bolt back far enough so that one arm of thetorsion spring can be sprung away from the springactuator. Remove the spring actuator, spring, andany spacers present. Remove the molded coverplate exposing the contacts of the first stage.

6

Control and Transfer Switch Type SBM GEH-2038

Each cam has one number and seven lettersaround the shaft opening on one side of the cam andeight letters on the other side of the cam. Whenremoving cams, mark the letter of the cam whichcorresponds to the shaft identification mark; thuscam and cam followers are removed in succession.This is done to each succeeding barrier.

The parts which fit into the front support maynow be assembled, placing the stops, if present, intheir proper position with respect to the shaftidentification mark.

RENEWAL PARTSIt is recommended that sufficient quantities of

renewal parts be carried in stock to enable theprompt replacement of any that are worn, brokenor damaged.

When ordering renewal parts, address thenearest Sales Office of the General Electric Com-pany, specify quantity required, name of partwanted,and give complete nameplate data.

When reassembling, it is only necessary tostack the cams back into the shaft in the same orderas taken off , keeping the proper cam letter linedup with the shaft identification mark.

Before tightening the tie bolts into the frontsupport, make sure that all the barriersareproperlynested.

7

GENERAL ELECTRIC SALES OFFICES GEZ- 2500KREADY TO ASSIST YOU ... When You Have Electrical Problems ... Need Further Information . . . Require Ordering Instructions

LOUISIANA OHIOSALES OFFICE CODE KEY 665 W. Market St.

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VERMONT

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P.O. Box 308

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GENERAL ELECTRIC SERVICE SHOPSperformance of your equipment. For full information about these services,contact your nearest service shop or sales office.

WHEN YOU NEED SERVICE .. . These G-E service shops will repair, recondi-tion, and rebuild your electric apparatus. The facilities are available day andnight, seven days a week, for work in the shops or on your premises. Latestfactory methods and genuine G-E renewal parts are used to maintain peakALABAMA

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G.E. Co., P.O. Box 797r !C COMPANY, PHILADELPHIA , PA.GENERAL ELr4 - 6 4