Enclosed Pre-Wired Relay Coil Voltage 277V AC Contact Form SPDT Current Rating 20 A Mounting Style Surface Nipple Size 0.50 in NPT Contact Rating (AC) 10 A @ 120/277V 20 A @ 277V Input Voltage 208 to 277V AC NEMA Enclosure Rating 1 Body Depth 1.8 in Body Height 3.2 in Body Width 2.3 in Contact Material Silver Alloy For Use With Exhaust Fans Motors Vacuums Frequency 50/60 Hz Horsepower @ 120V AC 1 hp Lead Length 16 in Maximum Operating Temperature 140 Degrees F