Low-voltage vacuum contactor

Vacuum contactor uses vacuum arc extinguishing chamber to frequently connect and cut off the normal working current. It is usually used to connect and disconnect 6kV, 380V(660V, 1140V) AC motors with frequent start and stop of medium and low voltage in a long distance.

Category: Vacuum contactor

key word : Low-voltage vacuum contactor

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Product Details

Series of low voltage vacuum AC contactor is widely used in coal mine, electric power, metallurgy, textile. Various industry sectors such as high-rise buildings.

Low voltage vacuum AC contactor is suitable for AC: 50HZ. Rated voltage: 1140V, rated current 63 to 630A feed network, for long-distance connection and disconnection of circuits, and frequent starting and stopping of AC motors. It is particularly suitable for assembling with various protection devices into a flameproof electromagnetic starter. The vacuum contactor is mainly composed of a vacuum interrupter and an operating mechanism. The vacuum interrupter has two functions of reliable arc extinguishing when the normal working current is passed and the working current is frequently cut off. But can not cut off the load current and short-circuit current. The operating mechanism is composed of a holding coil with an iron core and an armature. The coil is energized to attract the armature and the contactor is closed; the coil is de-energized and the contactor is disconnected. Holding coil generally has two forms of DC and AC.

The outer shell of the vacuum interrupter is made of glass or ceramic insulating material, and the internal vacuum degree is usually above 0.01Pa. Due to the less air in the shell, the contact distance can be made very small, and the arc is easier to be extinguished. Contact materials are generally made of copper, antimony, hungry and other alloys. The function of the shielding cover in the fox extinguishing room is that when the current is broken, the metal vapor diffused in the gap of the condensation contact is helpful to extinguish the arc, and it can also prevent the metal vapor from splashing on the insulating shell to reduce its insulation strength.