What is a contactor

A contactor is an electrical device which is used for switching an electrical circuit on or off. It is considered to be a type of relay. However the basic difference between the relay and contactor is that the contactor is used in applications with higher current load, whereas the relay is used for lower current applications. These contacts are in most cases normally open (NC) and provide operating power to the load when the contactor coil is energized. Contactors are most commonly used for controlling electric motors.
There are various types of contactors, and each type has its own set of features, capabilities, and applications. Contactors can break current over a wide range of currents, from a few amps to thousands of amps, and voltages from 24 VDC to thousands of volts. These electrical devices come in varying sizes, from hand held dimensions to sizes measuring a meter.
The most common application area of the contactor is high current load. Contactors are known for their capability to handle currents of over 5000 amps and high power over 100 kW. Heavy motor currents produce arcs when being interrupted. These arcs can be reduced & controlled using a contactor.
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