Contactor is maintain to non -pressure

The utility model discloses an ac contactor is maintain to the non -pressure, but has set up main contact, travel switch, combined floodgate direct current magnet, tripping operation direct current magnet, mechanical latching device, system's power failure still tripgear and mechanical transmission tripgear. When the system has a power failure, or press the XTA button, discharge the realization hand trip to the trip coil through the condenser, or relay mistake magnetism, its normally closed contact is closed to be put through, passes through the NO -contact of contactor again, makes electric capacity discharge to the trip coil, realizes the automatic trip, or realize pure machinery tripping operation through the mechanical transmission tripgear, if became invalid in the capacitor discharge return circuit, still the machinery tripping operation is realized to accessible mechanical transmission tripgear. The utility model discloses can not only realize original hand trip, can realize the automatic trip moreover, the fully provided customer's demand, the structure is more reasonable moreover, operates even more ideally, be difficult to to damage moreover, the appearance is pleasing to the eye.