Siemens 20 A SPNO Solid State Relay, Zero Crossing, DIN Rail Thyristor, 460 V Maximum Load. Minimum Load Current: 0.5 A. Range: Sirius Classic. Minimum Load Voltage: 48 V. Minimum Control Voltage: 15 V dc. Maximum Control Voltage: 24 V dc. Terminal Type: Screw. Maximum Turn On Time: 1 (+1/2 cycle) ms. Dimensions: 22.5 x 140.5 x 100mm. Length: 22.5mm. MPN: 3RF2320-1AA04