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General Information

Introduction

Siemens SB Encased Systems Breakers bridge the perfor-

mance gap between Molded Case Circuit Breakers (MCCB)

and Low Voltage Power Circuit Breakers (LVPCB).

Modern computer-aided design and manufacturing tools were

used to effectively blend the technologies of the MCCB and

LVPCB. This combination has resulted in a family of encased

systems circuit breakers that exhibit the most desirable char-

acteristics of each of the parent technologies. Included in

these characteristics are high interrupting capacities, high

withstand capabilities (magnetic stress), high-shorttime

capabilities (overcurrent heating), and high mechanical and

electrical endurances without maintenance.

Applications for SB breakers include main, tie, feeder, and

emergency source breakers in industrial plants, large commer-

cial complexes, and medical and health care facilities. The circuit

breakers are constructed for either ﬁxed or drawout installation.

They can be physically grouped in central distribution switch-

boards or used separately in stand-alone applications.

The SB breaker is equipped with a two-step stored energy

mechanism for closing and opening the breaker contacts. After

a closing operation, sufﬁcient energy is retained in the two-step

stored energy mechanism to perform the tripping function. The

mechanism may be charged manually with the integrated low-

force charging handle or electrically with the optional electric

motor operator. Pushbuttons, switches, and color-coded indica-

tors allow for easy close and open operations

Siemens Encased Systems Breakers

One piece molded

base and cover for

structural integrity.

Integral key interlock.

Breaker operating

controls grouped

in central escutcheon.

Compact dimensions allow 6-high

mounting of 800 and 1200 ampere

breakers and 4-high mounting of

2000 ampere breakers in a standard

switchboard section.

Meets or exceeds applicable

UL and CSA requirements.

U-shaped charging handle

allows the user to easily

charge the mechanism

from any angle.

Manual close button

and charging handle

are interlocked.

Extended line/load bus for

2000 through 5000 ampere frames.

Sealable trip unit cover.

Completely insulated/encased

construction.

Color keyed label indicates

a choice of three interrupting

ratings.

Mounting holes are outboard

for ease of access and are

identical for 400 through

2000 ampere frames.

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