Circuit breaker including forced contact parting mechanism capable of self-retaining under short circuit condition

摘要

Disclosed is a circuit breaker including a first linking member for switching fixed contacts provided in a main current path. The first linking member is operated by a circuit switching mechanism using a voltage-operated electromagnet, a forced contact parting mechanism upon short circuit condition using a current-operated electromagnet connected in series to the main path, and a spring releasing mechanism responsive to flow of overcurrent for operating. The forced contact parting mechanism upon short circuit condition includes a link mechanism including self-retaining/self-resetting function between the first linking member and the current-operated electromagnet.