A contactor is a device for creating and breaking an electrical power circuit. For example, we normally use a contactor for turning on & off an electrical motor. Unlike relays, contactor are prepared with qualities to control and suppress the arc made when interrupting heavy motor currents. Contactors come in many states with various capacities and characteristics. Unlike a circuit breaker, a contactor is not planned to interrupt a short circuit current. The contactor is mainly used in higher current carrying capacity applications, while the relays are used for lower current applications.