120-277VAC SPST operation and requires a momentary 24VAC (21-30VAC) switch circuit pulse to open or close the line-voltage circuit. It may be used to full rated capacity for tungsten filament, ballast or resistive loads. Line-voltage terminals accept copper wire only. This relay can be used to replace earlier discontinued GE models RR2, RR3, RR5, Sierra 7601P and standard Bryant relays of a similar type. When replacing these older relays you will need to remove the yellow plastic plug on connector, strip the leads and connect the old red wire to the new red wire, the old black wire to the new black wire and the old white (or other color) wire to the new blue wire. RR7P is the newer version of the RR7EZ which has individual fast-on connectors for each wire lead. Both can be used to replace the basic RR7. You just need to snip off the fast-on connectors and strip the wires.