Switching Over Capacitor Contactor structure and working principle

Switching Over Capacitor Contactor structure and working principle

Structure :

Switching over capacitor contactor is composed of charge suppression inrush device and AC contactor. The action mechanism is direct-acting type. The contact is of double break point. E-shaped core offers magnetic system which is the suction reaction of the tower spring.

Working Principle:

When it is momentarily energized, Bulk capacitances charge current of the capacitor will aries large current surges to make the circuit momentarily overloaded which will blow the fuses. The capacitor switching contactor charges the capacitor through the current limiting resistor, and turns on the power through the internal delay device which will reduce high-current impact of the circuit to prevent damage to the line fuse, etc.


1.      Current-limiting main contacts and contactor main contacts are separated during normal operation and they act accordingly.
2.      There are many auxiliary contacts. There are three pairs below 32A and four pairs above 40A, which can be combined in any combination of normally open and normally closed.
3.      There is a full range of eight sizes of 16, 25, 32, 40, 50, 63, 80 and 95A. The respective capacities are equipped with contactors of corresponding capacities.
4.      The capacity is controlled by the switching capacitor which is designed to have a large safety factor and a certain margin; safe and reliable.
5.      Current limiting resistors are symmetrical, linear, insulated, and heat resistant.
6.      The tower-shaped reaction springs of the contactor make the sucking reaction force match well. The magnet sucks smoothly, and the electromechanical life is high.
7.      The product has high technical and economic standard, and has high breaking capacity and current limiting capability.