This is a BRAND NEW Mars2 17315 Single Pole Contactor rated at 30 amps. Contactor has a 24 volt coil. Thanks for looking and good luck!
A contactor form of a relay. Relays are switches that open and close circuits electrically. In most HVAC equipment a low voltage coil relay (24 vac) is energized in order to open or close a higher voltage (usually 120-240) circuit.