AC Contactor Selection Principles

The rated voltage of the main contacts must not be less than the rated voltage of the control circuit. The rated current of the main contacts should meet the load requirements; for resistive loads, it should be equal to the rated current; for motor loads, it should be slightly greater than the rated current. The voltage of the attraction coil is selected according to the complexity of the control circuit. Simple circuits can use 380 V or 220 V, while complex circuits can use 36 V or 110 V. The number and type of contacts must meet the basic standards of the control circuit.