Features of DC contactors

1、 Its core and armature are made of a solid piece of solid material instead of silicon steel sheet;

2 、DC voltage coil has a large DC resistance value;

3 、has DC main contacts and auxiliary contacts of different numbers, the main contacts have arc extinguishing devices, and some do not have arc extinguishing devices. DC contactors are mainly used for long-distance switching and breaking of loads in DC circuits.

The DC contactor is also composed of an electromagnetic mechanism, a contact system, and an arc extinguishing device. For example, the electromagnetic mechanism is composed of an iron core, a suction coil and an armature, and a folding structure in which an angular rotation is used is often used. Since the current passing through the suction coil is direct current, under normal circumstances, the current in the coil does not cause eddy current to the iron core, so that the iron core does not generate heat, so it has no iron loss, so the iron core can be made of integral cast iron or cast steel. . The number of turns of the DC low-voltage contactor coil winding is much larger than that of the AC contactor coil, so the DC contactor coil has a large resistance value.