Single-stage vacuum contactor

Abstract

The invention relates to a single-stage vacuum contactor. The single-stage vacuum contactor comprises an insulating frame and a cover lid arranged on the insulating frame. A vacuum arc extinguishing system, an electromagnetic system, a self-coupling voltage transformation rectification energy saving control module connected with the electromagnetic system, a transmission pressure system and an anti-damage dustproof auxiliary switch. The transmission pressure system comprises a return spring, an overtravel spring, a movable ejector rod and an anti-closing bounce spring which are arranged from left to right in order. The vacuum arc extinguishing system comprises an insulating shell body. The anti-closing bounce spring is arranged in the insulating shell body. A transformer is arranged in the self-coupling voltage transformation rectification energy saving control module. The electromagnetic system comprises a coil. The coil is arranged at the periphery of the return spring. An overtravel ejector rod is arranged between the overtravel spring and the return spring. The above structure is employed, the beneficial effects are that the structure is firm and reliable and the product service life is long.

Description

technical field [0001] The invention relates to a contactor, in particular to a single-stage vacuum contactor. Background technique [0002] Vacuum contactor is an automatic control electrical appliance. It uses an insulating shell to extinguish the arc. It is mainly used for frequently connecting or breaking AC and DC circuits. It has a large control capacity and can be operated from a long distance. It can be used with relays to achieve timing operations and interlocking. Control, various quantitative control and loss of voltage and undervoltage protection are widely used in automatic control circuits. The main control object is the motor, and it can also be used to control other electrical loads, such as electric heaters, lighting, electric welding machines, capacitor banks, etc. The vacuum contactor has the characteristics of strong arc extinguishing ability, good pressure resistance, high operating frequency, long life, no arc spraying, small size and light weight. [...

AI Technical Summary

Problems solved by technology

However, if the resistance is connected in series with the coil, the voltage of the coil is often unstable, and the heating of the coil is very serious, which not only wastes electric energy, but also shortens the life of the contactor due to the aging of the insulating layer of the coil at high temperature.

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