Morris, Manning & Martin LLP
Permanent-magnet ground fault circuit interrupter plug and its permanent-magnet mechanism therein
A permanent-magnet ground fault circuit interrupter plug with self-diagnosing function having an enclosure and a permanent-magnet mechanism encased in the enclosure. In one embodiment, the permanent-magnet mechanism includes a frame assembly having a crossbeam, a frame pressure post and a core connecting post positioned at each side of the crossbeam, a core attached to the core connecting post and positioned inside a coil assembly, a spring sleeved on the core connecting post and positioned therebetween an inner cam of the coil assembly and the crossbeam of the frame assembly; a circuit-breaking coil and a circuit-connecting coil wound on the coil assembly, respectively, a permanently magnet positioned proximately to the core, a pair of movable contact arms with each having one movable contact positioned at each lateral side of the frame pressure post for communicating with the frame assembly, a pair of fixed contacts positioned above the corresponding movable contacts, and a metal oxide varistor with one end electrically connected to a first terminal of a power source directly and the other end electrically connected to a second terminal of the power source from a load side across a circuit breaker.
General Protecht Group Inc.
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Wusheng Xiaoyong Yong
Chen Li Dai