Molded Case Circuit Breaker Frame Sizes

The size contact rating and current interrupting ratings are the same for all circuit breakers of a given frame size.

Molded case circuit breaker frame sizes. The 3va range of molded case circuit breakers provides ul frame sizes covering 125a to 1000a with the 3va5 thermal magnetic trip unit and 3va6 electronic trip unit models as well as iec frame sizes covering 100a to 630a with the 3va1 and 3va2 models. 100 225 400 600 800 and 2 000 amps. Designed for electrical and machinery oems serving a range of industries and applications these proven designs incorporate the latest in innovation with the high reliability that has been our hallmark since the advent of the circuit breaker in the 1920s. They re used in construction commercial buildings control and monitoring and other industrial and commercial applications.

The maximum setting is established by protection of the minimum conductor size in the circuit. P frame square d molded case circuit breakers are rated up to 1200a and 600vac and interrupt excessive current flows to protect devices from electrical damage. Eaton s globally accepted series g 15 2500 amperes for ul csa and iec applications. Series g molded case circuit breaker.

Trip elements trip the operating mechanism of a circuit breaker during either a prolonged overload or a short circuit current. There are six frame sizes available. Some molded case circuit breakers have a screwdriver slot located on the front of the trip unit used for adjusting sensitivity.