DC Solid State Relay SSR-40DD. Optical Isolation Between the Control Loop and the Load Loop. Thyristor Output Zero Current Shutdown Voltage Zero Crossing. Use a Suitable Radiator when Using and Add Forced Air Cooling if Necessary. Control Signals Are Compatible with TTL Logic. Flame Retardant Engineering Plastic Shell Metal Bottom Plate Specifications: Place of Origin: Mainland DC Solid State Relay Contact Form: Normally Open Power Mode: Direct Current Input Parameters: Control Mode: 3-32VDC (DC) Input Current: 10mA Work Instructions: LED Off Time: 10mS (milliseconds) Reliable Shutdown Voltage: Less Than 0.8VDC Output Parameters: Output Withstand Voltage: DC 12-480VDC Has a Higher 1200VDC 1700VDC Rated Operating Current: 10A,15A,25A,40A,60A,80A,100A On-state Voltage Drop: 0.70V Minimum on Current: 50mA Off-state Leakage Current: 10mA Maximum Inrush Current (10ms): 10 Times Rated Operating Current Performance Parameters: Medium Withstand Voltage: 2500VAC (1 Minute) Insulation Voltage: 2500V Insulation Resistance: 100M Working Temperature: -35 ~ 75 C Power Frequency: 50/60HZ Heat Dissipation Conditions: 25A with Radiator 40A Plus Fan Strong Cooling Load Current Safety Factor: Resistive Load 50% Inductive Load 30% Frequent Work or Poor Environment Should Be Derated Dimensions: 65.5L 45.0W 23.5H