S&C MetaI-Enclosed SwitchgearSimple, reliable, flexible, and economical . . . the intelligent solution toyour in-plant medium-voltage switching and protection needs.S&C Metal-Enclosed Switchgear, rated 4.16 kv through34.5 kv, features reliable, time-tested fuses and manualor power-operated interrupter switches in rugged11-gauge steel enclosures. Switchgear bays areconfigured into integrated packages for applicationflexibility, operating simplicity, and superior dependa-bility in switching and protecting medium-voltagepower circuits in commercial, institutional, industrial,and high-rise installations. S&Cs expertise in this fieldhas been established during nearly 50 years of metal-enclosed-switchgear design and manufacture, and iscomplemented by UL listing of all S&C Metal-EnclosedSwitchgear rated 4.16 kv through 13.8 kv with600-ampere or 1200-ampere main bus.

S&C Metal-Enclosed Switchgear is available in twotypes-modular and custom. S&C System II ModularMetal-Enclosed Switchgear consists of pre-engineeredsingle-bay modules assembled into configurations that

circuit breakers . . . simplifies upstream coordination,minimizes short-circuit stresses on the system.A choice of unique response curves with maintenance-free S&C Electronic Power Fuses providing protec-tion not available with any other protective devices,even circuit breakers with their relays and batteries.Three-phase protection for three-phase loads. S&Celectronic overcurrent relays provide isolation forthree-phase loads from single phasing and other open-phase conditions.Single-phase protection for single-phase loads.Fuses . . . unlike circuit breakers . . . selectively isolateonly faulted phases of feeders serving single-phaseloads.

Threefold Economyfit most application requirements. Drawing preparationand approval time is minimized, and you gain all theeconomies of repetitive manufacture. For thoserequirements that cannot be fully satisfied withmodules, S&Cs experienced team of specialists willcustom design switchgear for your application.

Power-System-Matched Switchingand ProtectionFull-load switching, plus S&Cs unique one-time andtwo-time duty-cycle fault closing ratings. S&CInterrupter Switches carry and interrupt rated loadcurrents even after being closed into available faultcurrents corresponding to their fault-closing ratings-you can restore power quickly without first having torepair switches inadvertently closed into a fault.One-cycle total clearing with S&C SM and SML PowerFuses compared to the 5 cycles or more required byLow purchase cost economies inherent in theinterrupter switch and fuse protection concepttranslate into significant first-cost savings.

Low installation cost metal-enclosed switchgear,light by comparison with breaker gear, is easy to handleand needs no foundation, no support channels . . . onlya level floor or pad. Multibay lineups assemble witha minimum of interbay bolting, and inter-unit busconnections need no taping. Simple field assembly. . .with no relays to set and test. . . means less time,equipment, and manpower for installation. And futureadditions to a lineup are readily accomplished as yoursystem expands.

Low maintenance cost S&C fuses are nondamageableand do not require any maintenance or calibration toperpetuate the accuracy of their time-current charac-teristics. S&C Interrupter Switches are maintenancefree . . . requiring only an occasional exercising. Andall thats required with S&C gear is a check of theinsulators and, if necessary, a simple cleaning.

S&C Metal-Enclosed Switchgear With Interrupter SwitchesIndoor and Outdoor Distribution (4.16 kv through 34.5 kv)And Power Fuses

Matchless Construction Features Assure Long Service Life.The top-quality features of S&Cs switchgear bring thesuperior reliability and security needed to assureservice continuity on your medium-voltage distributionsystem. Described below are some of the many built-in reasons for specifying S&C Metal-Enclosed Switch-

gear . . . in both the outdoor style illustrated below andthe indoor style that differs only in a finish suited toindoor requirements and omission of certain weather-proofing features.620-35 DESCRIPTIVE BULLETINPage 2 of 4October 26, 1992

A wide choice of S&C components-exhaustively tested, field proven, ofunequaled performance and operational dependability--all expresslydesigned to solve your power distribution problems.Page 3 of 4October 26, 1992

DESCRIPTIVE BULLETIN 620-35

S&C Metal-Enclosed Switchgear With Interrupter SwitchesIndoor and Outdoor Distribution (4.16 kv through 34.5 kv)And Power Fuses

Simplified Power-System PlanningSimple, reliable, economical-S&C Metal-EnclosedSwitchgear is readily configured into basic circuitarrangements that make power-system planning anddesign easy . . . implementation is logical and straight-forward. The basic arrangements shown below are often

combined to handle even the most complex distributionsystem need . . . assuring maximum service continuityfor extremely critical loads. Illustrated here are someof the most common arrangements.620-35 DESCRIPTIVE BULLETINPage 4 of 4October 26, 1992