Enclosed Pre-Wired Relay, Coil Voltage 277V AC, Contact Form SPDT, Current Rating 10 A, Mounting Style Surface, Nipple Size 0.50 in NPT, Contact Rating (AC) 10 A @ 277V, Contact Rating (DC) 10 A @ 28V, Input Voltage 10 to 30V AC, 208 to 277V AC/DC, NEMA Enclosure Rating 1, Body Depth 1.5 in, Body Height 2.8 in, Body Width 1.7 in, Contact Material Gold Flashed Silver Cadmium Oxide, For Use With Exhaust Fans, Motors, Vacuums, Frequency 50/60 Hz, Horsepower @ 120V AC 1/6 hp