dropout voltage 408 vac, range 365-456 vac, pickup voltage 456 vac, range 408-480 vac; operating voltage 480 vac, 50/60 hz.; dpst, no contacts, can be modified to dpdt, each contact rated for 3a at 480v AC width 2.625 inch, heigth 4.5 in., depth 5 inches; mounts with four (4) 0.1875 inch holes on 1.625 in by 4.125inch mounting centers; 0 degrees c to 45 degree c operating temperature; 2.5burden; monitor weight 2.125 lbs, shipping weight 4 lbs.