CRYDOM D53TP50CH10 Solid State Relay, 4 to 32VDC, 50A. More details: Solid State Relay, Max. Output w/Heat Sink 50A, Input Voltage 4 to 32VDC, Voltage Output 48 to 530VAC, Turns On At Random Cross, 3 Phase, Switch Type SCR, Mounting Surface, Finger Safe Yes, Case Color Gray, Standards UL, CE, Includes Thermal Pad