In electrical engineering. A contactor is used to connect or disconnect a DC circuit breakers main circuit or a large capacity with a load control circuit automatic switch, the main control object is a motor, in addition to other electrical loads such as electric heaters, electric welding, lighting equipment, contactors not only turn on and off the circuit, but also has a protective effect of low-voltage release /. Contactor control capacity. Suitable for frequent operation and remote control. Is one of the important components of the automatic control system. Universal contactor can be broadly divided into the following categories.
An AC contactor. Mainly by the electromagnetic mechanism, mcb circuit breaker contact system, interrupter devices and other components. Commonly used CJ10, CJ12, CJ12B series.
2 DC contactor, generally used to control the DC electrical equipment, winding through the DC, the operation principle and structure of the DC contactor AC contactor is basically the same [1].
But now contactor models are re-divided. All of the AC series.
1; AC-1 class contactor is used to control non-inductive or slightly sense circuit.
2; AC - class 2 contact is used to control the start and wound rotor induction motor breaking in.
3; AC-3 and AC - 4 contactor controlled induction Switchgear & Substation motor can be used for frequent starting and breaking.
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