Patent ID: 6313975
Filing Date: 2001-11-06
Classification: H02H

Abstract:
A zone selective interlocking system for electronic trip circuit breakers comprising:a plurality of downstream terminals, each downstream terminal connecting with at least one of a plurality of downstream electronic trip circuit breakers having input terminals;a restraint input circuit module connected to the input terminals of each of the downstream electronic trip circuit breakers wherein the input terminals are shorted together for providing a self-restraint signal for each downstream electronic trip circuit breaker at the occurrence of a downstream fault condition;a plurality of upstream terminals, each upstream terminal connecting with at least one of a plurality of upstream electronic trip circuit breakers having input terminals; anda restraint input circuit module connected to the input terminals of each of the upstream electronic trip circuit breakers for receiving a signal indicative of the downstream fault condition and wherein the restraint input circuit module is self-sourcing thereby providing sufficient energy to place each of the upstream electronic trip circuit breakers in a restrained mode.