Alternating-current contactor with coil short-circuit protection function

Abstract

The invention discloses an alternating-current contactor with a coil short-circuit protection function, and relates to the technical field of motor protection. The alternating-current contactor comprises a three-phase motor, a first circuit breaker, a second circuit breaker, a first button switch, a second button switch and an alternating-current contactor body; the phase C of a three-phase powersupply is connected in series with the first circuit breaker, a coil of the alternating-current contactor, the second button switch, the first button switch and the second circuit breaker in sequenceand is connected into the phase A of the three-phase power supply; and the second button switch is connected with an auxiliary contact of the alternating-current contactor in parallel. The circuit connection is simple; fewer electric wires are connected to each alternating-current contactor, so that the electric wires can be saved and the wiring in an electrical switch cabinet is conciser and clearer; the electric wires or components can be replaced conveniently in later maintenance work; the misoperation is avoided; the production is not affected; the industrial standards are met; the manufacturing cost is low; and the contactor is suitable to be popularized and used by enterprises and is easier to use and accept by electricians.

Description

technical field [0001] The invention relates to the technical field of motor protection, in particular to an AC contactor with self-carrying coil short-circuit protection. Background technique [0002] For a long time, people have used fuses as protectors for the secondary lines of AC contactors. Because there are often many AC contactors in electrical switchgear, the sizes of fuses and AC contactors are very different. , so it is necessary to connect multiple fuses in the circuit, and multiple fuses need to be fixed in the switch cabinet. When multiple fuses are used, the wiring of the secondary line in the switch cabinet will be very complicated, resulting in messy wiring in the switch cabinet. During daily maintenance or replacement of push button switches, indicator lights and other components, it is often due to the intricate wiring. , can’t find the line to be adjusted, and can’t find the two fuses connected to each AC switch. If there is a misoperation during the per...

AI Technical Summary

Problems solved by technology

When multiple fuses are used, the wiring of the secondary line in the switch cabinet will be very complicated, resulting in messy wiring in the switch cabinet. During daily maintenance or replacement of push button switches, indicator lights and other components, it is often due to the intricate wiring. , can’t find the line to be adjusted, and can’t find the two fuses connected to each AC switch. If there is a misoperation during the period, the wrong line or the wrong fuse are connected, the The motor is turned off by mistake, and the wiring needs to be rewired later, which affects the production progress, and the direct replacement of the fuse without turning off the fuse may cause a major safety accident of electric shock to the electrician

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