PERMANENT-MAGNET GROUND FAULT CIRCUIT INTERRUPTER PLUG AND ITS PERMANENT-MAGNET MECHANISM THEREIN

摘要

A permanent-magnet ground fault circuit interrupter plug with self-diagnosi ng function having an enclosure and a permanent-magnet mechanism encased in the enclosure. In one embodiment, the permanent-magnet mechanism includes a fram e assembly having a crossbeam, a frame pressure post and a core connecting pos t 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 connecti ng 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 position ed at each lateral side of the frame pressure post for communicating with the fram e assembly, a pair of fixed contacts positioned above the corresponding movabl e 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 breake r.