Siemens 20 A SPNO Solid State Relay, Zero Crossing, DIN Rail, 230 V ac Maximum Load. Minimum Load Current: 2 mA. Range: Sirius Classic. Minimum Load Voltage: 24 V ac. Minimum Control Voltage: 110 V ac. Terminal Type: Screw. Dimensions: 100 x 22.5 x 140.5mm. Height: 140.5mm. Depth: 22.5mm. Maximum Operating Temperature: +60°C. MPN: 3RF2320-1AA22