Current gain control of circuit breaker trip unit

Details Current gain control of circuit breaker trip unit Current gain control of circuit breaker trip unit

H - Electricity

01

H

H01H 71/74 (2006.01) H01H 83/10 (2006.01)

Patent

CA 2662244

An electronic trip unit (100) for a circuit breaker, the electronic trip unit (100) includes a rating plug (110) having a plurality of switches (SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8) each configured to indicate a specified current rating for the rating plug (110) and for selectively supplying a current rating for the electronic trip unit (100), a processing unit (140) which receives and reads a value of the selected current rating from the rating plug (110) upon power-up, and a gain control unit (120) including a plurality of gain circuits (122). Each of the gain circuits (122) including a plurality of gain switches (124) set by the processing unit (140) based upon the selected current rating, to control a gain of input current of the electronic trip unit (100).

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