Circuit breaker and trip unit employing multiple function...

Details Circuit breaker and trip unit employing multiple function... Circuit breaker and trip unit employing multiple function...

H - Electricity

02

H

H02H 3/093 (2006.01) H02H 3/00 (2006.01) H02H 3/02 (2006.01)

Patent

CA 2478735

A trip unit for a circuit breaker for an electrical circuit includes a current transformer adapted to sense a current flowing in the electrical circuit and to provide a signal representative of the current. A microprocessor includes a memory, a rotary selector switch, and a routine evaluating the sensed current with respect to a plurality of predetermined current/time condition, such as long delay protection, override protection, short delay protection and/or ground fault protection, and responsively generating a trip signal. The rotary selector switch has a plurality of positions. Each of the positions selects a first time value, such as a short delay time for a first one of the predetermined current/time conditions, and selects a second time value, such as a ground fault time, for a different second one of the predetermined current/time conditions.

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