1, AC contactor coil. The coil is usually identified by A1 and A2, which can be simply divided into AC contactor and DC contactor. We often use AC contactor, of which 220/380V is more commonly used:

2, AC contactor main contact. L1-L2-L3 is connected to the three-phase power supply inlet line, T1 – T2-T3 is connected to the power supply outlet line, which can be used to connect the load line. AC contACTOR main contact is normally open contact, mainly connected to the main circuit, control the motor and other equipment to start and stop!

3, AC contactor auxiliary contact. Auxiliary contacts can be divided into normally open point NO and normally closed point NC.

NO 3-1 normally open point, usually NO normally open point is mainly used to control contactor self-locking and transmit signals to use operation, such as: NO ac contactor normally open point by a red indicator light can be used as a motor running lights, when the ac contactor to electricity, NO closed normally open point, turn on the light, to deliver the motor or the signal of the electric circuit.

3-2, the normally closed point of AC contactor NC. In general, AC contactor normally closed point NC is mainly used for circuit interlocking and signal transmission.

For example: motor positive and negative control circuit is the use of contactor normally closed point NC interlocking function.

For example, the normally closed point NC of the AC contactor is connected with a green indicator light, which can be used as the stop indicator of the circuit or motor. When the AC contactor is powered, the normally closed point NC is disconnected, the stop indicator light goes off, the corresponding operation indicator light is on, and the circuit runs.