Transformer Relay Coil Volts 24 Transformer Primary (V) 120 V Transformer Secondary (V) 24 V Switch Type SPDT 3/4 hp HP - 12 A Full Load Amps @ 120VAC 72 A - 6 A 35 A - 6 A Full Load Amps @ 240VAC - - - Full Load Amps @ 277V - - - - - - - - - - - - 1 in 4 in 4 in 4 x 4 in Junction Box Mounting Low-voltage Control of Line-voltage Fans Pump Motors Forced Air or Hydronic Heating/Cooling Systems UL Includes Transformer and Relay