CRYDOM D2450B Solid State Relay, 3 to 32VDC, Zero Cross. More details: Solid State Relay, Max. Output w/Heat Sink 50A, Input Voltage 3 to 32VDC, Voltage Output 24 to 280VAC, Turns On At Zero Cross, 3 Phase, Switch Type SCR, Case Color Black, Standards UL, CSA, VDE, CE