A contactor is an electrically controlled switch used for switching an electrical power circuit, similar to a relay except with higher current ratings and a few other differences.Relays are used where it is necessary to control a circuit by a separate low-power signal, or where several circuits must be controlled by one signal. A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor. SKU: 3TH30220AP0 Product Features: 10A, 2″NO”+2″NC”, COIL: 230VAC 50HZ., S0 , AC15, SICONT CONTACTOR RELAY)