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General Information
Introduction
Siemens SB Encased Systems Breakers bridge the per
formance 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 characteristics of each of the parent
technologies. I ncluded in these characteristics are high
i nterrupting capacities, high withstand capabilities (mag
netic stress), h igh short-time capabilities (overcu rrent
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
commercial complexes, and medical and health care
SB Encased Systems Breakers
2
800 Ampere Frame
facilities. The circuit breakers are constructed for either
fixed or drawout installation. They can be physically
grouped i n central distribution switchboards, 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 man
ually with the i ntegrated low-force charging handle or
electrically with the optional electric motor operator. Push
buttons, switches and color-coded indicators allow for
easy close and open operations .
NOTE: Photographs and illustrations o f 2000A
breaker used for illustration purposes only.
4000 Ampere Frame
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