OMRON G3NA-220B-AC200-240 Puck Style Solid State Relay, Zero Cross. More details: Solid State Relay, Max. Output w/Heat Sink 20A, Input Voltage 200 to 240VAC, Voltage Output 24 to 240VAC, Turns On At Zero Cross, 3 Phase, Switch Type Photocoupler, Case Color Beige, Standards UL, CSA