Contact Arm Mechanism for Circuit Breaker

摘要

A mechanism (24) for a circuit breaker contact arm that allows current limiting by reducing the opening time is disclosed. A contact arm (32) is coupled to a contact arm mechanism that includes a carrier (52) coupled to a first pair of linkages (54, 56). A second pair of linkages (70, 72) is coupled to the first pair of linkages. A second carrier (78) coupled to the second pair of linkages (70, 72) attaches to the contact arm mechanism (24) to a main circuit breaker mechanism through a lay shaft assembly (22). Upon the occurrence of an undesired electrical condition, the contact arm mechanism (24) moves from a locked to an open position allowing the contact arm (32) to blow open.