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General Information

NOTE: For more information on other standard and

optional trip unit features, see Siemens Electronic Trip

Units for SB Encased Systems Breakers Information and

Instruction Guide Bulletin IPIM-2203 and the Sentron Sys-

tems Breaker Energy Communicating Trip Unit

Information and Instruction Guide Bulletin IPIM-2208.

The SB breakers incorporate several installation, operation,

and safety features.

Insulated – Encased Construction

The SB breaker’s housing, internal barrier, and front cover are

molded from a thermoset material with a high-dielectric

strength (electrical insulation). The one piece molded case

(base and housing) provides enhanced structural integrity. A

midbarrier provides outer wall reinforcement, integral arc baf-

ﬂing, and insulation/isolation between the two compartments

of the circuit breaker.

This patented construction provides a higher interrupting

capacity within a smaller housing than can be achieved by

more conventional construction. The electrical insulation prop-

erty of the thermoset material enhances operational safety.

The insulated case physically isolates and electrically insulates

users from the internal high voltage contacts.

The arc chambers and main contact structure are encased in

the back compartment. The trip unit, controls, springs of the

stored energy mechanism, and optional internal accessories

are located in the front compartment. Access to the front

compartment is by the removable front cover. Since the barrier

between the two compartments is made from the same insu-

lating thermoset material as the housing, the user is physically

isolated and electrically insulated from the main breaker mech-

anism and contacts when the front cover is removed.

Photo of 2000A Frame Shown for Illustration Purposes Only

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Siemens TL.. Bedienerhandbuch Seite 6