CRYDOM EL240A10R24 Solid State Relay, 21 to 27VDC, 10A. More details: Solid State Relay, Max. Output w/Heat Sink 10A, Input Voltage 21 to 27VDC, Voltage Output 3 to 100VAC, Turns On At Zero Cross, 1 Phase, Switch Type SCR, Mounting Flange, Finger Safe No, Case Color Black, Standards UL, CE