A contactor is an electrically controlled switch used for switching an electrical power circuit, similar to a relay except with higher current ratings.
A contactor is controlled by a circuit which has a much lower power level than the switched circuit. Contactors come in many forms with varying capacities and features. Unlike a circuit breaker, a contactor is not intended to interrupt a short circuit current.
Contactors range from those having a breaking current of several amperes to thousands of amperes and 24 V DC to many kilovolts.
The physical size of contactors ranges from a device small enough to pick up with one hand, to large devices approximately a meter (yard) on a side Contactors are used to control electric motors, lighting, heating, capacitor banks, thermal evaporators, and other electrical loads