Energy-saving alternating-current contactor with fault clearing lock

Abstract

The invention relates to an energy-saving alternating-current contactor with a fault clearing lock. A lock hook is fixedly mounted on a moving iron core; the fault clearing lock is mounted below or above a static iron core; and the head of a lock tongue stem of the fault clearing lock is adjacent to a center line of the lock hook. A connecting rod on which a reset spring is sleeved is arranged in a lock body, the front end of the connecting rod is fixedly connected with a lock tongue stem baffle, and the rear end of the connecting rod is fixedly connected with an iron absorption plate; an unlocking coil and an iron core are mounted in a rear cavity of the lock body; and the unlocking coil is connected with an open-phase and short-circuit fault automatic clearing circuit. The invention has the characteristics that the mechanical self-locking of the three-phase moving contact can be realized, so that the coil of the contactor is uncharged during the normal operation to prolong the service life of the coil of the contactor and save the electric energy and the resources; when the faults of open phase and short circuit exist in an electric line, a switch is automatically closed to power off, so that the economic benefit and the social benefit are huge.

Description

technical field [0001] The invention relates to an electrical switchgear for controlling the switching on and off of a three-phase circuit or a three-phase electrical appliance, in particular to an automatic protection switchgear capable of automatically clearing open-phase and short-circuit faults. Background technique [0002] In various existing three-phase circuits, relay self-locking devices are used. When the start button switch is pressed and then disconnected, the self-locking device continues to keep the contactor coil energized to ensure that the three-phase moving contacts of the AC contactor are in a closed state. That is, the contactor coil must be energized for proper operation. One of its defects is that the contactor coil consumes electric energy. According to estimates, the country loses more than 70 billion kilowatt-hours of electric energy every year for this reason; the second defect is that the contactor coil is charged for a long time, and the coil is...

AI Technical Summary

Problems solved by technology

One of its defects is that the contactor coil consumes electric energy. According to estimates, the country loses more than 70 billion kilowatt-hours of electric energy every year for this reason; the second defect is that the contactor coil is charged for a long time, and the coil is easily burned and damaged. Frequent replacement and maintenance consumes a lot of manpower and resources. In addition, when the circuit has a short circuit, open fault, etc., the existing AC contactor itself will not automatically disconnect and lacks automatic protection functions.

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