DC Solid State Relay SSR-40DD. Features: Optical isolation between the control circuit and the load circuit. Thyristor output with zero current switching and voltage zero crossing. Requires suitable heatsink during operation; forced air cooling recommended under high load conditions. Control input compatible with TTL logic levels. Flame retardant engineering plastic housing with metal base plate for efficient heat dissipation. Specifications: Origin: Mainland China Contact Form: Normally Open Power Type: Direct Current Input Parameters: Control Voltage: 3-32VDC Input Current: 10mA LED Indication: Off time 10ms Reliable Turn-Off Voltage: Less than 0.8VDC Output Parameters: Output Voltage Range: 12-480VDC Maximum Withstand Voltage: 1200VDC / 1700VDC Rated Operating Current: 10A, 15A, 25A, 40A, 60A, 80A, 100A On-State Voltage Drop: 0.70V Minimum Load Current: 50mA Off-State Leakage Current: 10mA Maximum Inrush Current (10ms): 10 times rated current Performance Parameters: Isolation Withstand Voltage: 2500VAC (1 minute) Insulation Resistance: 100MΩ Operating Temperature Range: -35°C to +75°C Power Frequency: 50/60Hz Cooling Requirements: Heatsink required for 25A operation; forced air cooling recommended for 40A and above. Load Derating Guidelines: Resistive loads: Use at 50% of rated current Inductive loads: Use at 30% of rated current Further derating recommended for frequent switching or high ambient temperatures. Dimensions: 65.5mm (L) x 45.0mm (W) x 23.5mm (H)