Contactor

Abstract

The invention discloses a contactor, and belongs to the field of electrical control. The contactor includes: a first static iron core wound with a first coil, a first movable iron core, the contact rod connected with the first movable iron core, a contact, a second static iron core wound with a second coil, a second movable iron core, a time relay and a lock rod. The first static iron core can attract the first movable iron core to a working position, and the second static iron core can attract the second movable iron core to the working position. The end part of the contact rod is provided with a first locking structure, the end part of the lock rod is provided with a second locking structure, and the first locking structure and the second locking structure are matched for locking; the first coil and the time relay are connected in series and are integrally connected with the second coil in parallel; the time relay is of an electrifying delay type and is disconnected after being electrified for preset time; the power of the second coil is less than the power of the first coil. The continuous electrifying of the first coil with high power is replaced with the continuously electrified second coil with low power matched with the locking structure, so that the heating is reduced, and the energy is saved.

Description

technical field [0001] The invention relates to the field of electrical control, in particular to a contactor. Background technique [0002] In the automatic control circuit system, the contactor is a necessary intermediate control element, which can frequently turn on and off the circuit, and cooperate with the thermal relay load device to play a certain role in overload protection. Compared with manually opening and closing circuits, the use of contactors to control circuits is more efficient, safer and more flexible, and can simultaneously open and close multiple load lines. Therefore, it is necessary to provide a contactor. [0003] The prior art provides such a contactor: it includes a static iron core wound with a coil, a moving iron core connected with a return spring, a contact rod and a contact. The moving iron core is arranged opposite to the static iron core, and the contact rod is connected on the moving iron core. Wherein, the terminal of the coil is connecte...

AI Technical Summary

Problems solved by technology

[0005] When the contact is connected to the electrical circuit with a large current, the contact or disconnection between the contact rod and the contact needs a faster response speed to avoid arcing. Therefore, a high-power coil is required, and the electrical load When the state of the circuit is changed, the high-power coil is always in the energized state, which consumes a lot of energy, and the continuous energization generates serious heat, which affects the service life of the contactor

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