DC Solid State Relay SSR-40DD Features: - Optical isolation between control loop and load loop - Thyristor output with zero-current shutdown and voltage zero-crossing - Requires suitable heatsink; forced air cooling recommended for high-load operation - Control signal compatible with TTL logic - Flame-retardant engineering plastic housing with metal baseplate Specifications: - Contact form: Normally open - Power mode: Direct current - Input control mode: 3–32 VDC - Input current: 10 mA - LED indicator: Off time 10 ms - Reliable shutdown voltage: < 0.8 VDC - Output withstand voltage: 12–480 VDC (with peak ratings up to 1200 VDC / 1700 VDC) - Rated operating current: 10 A, 15 A, 25 A, 40 A, 60 A, 80 A, 100 A - On-state voltage drop: 0.70 V - Minimum on-current: 50 mA - Off-state leakage current: 10 mA - Maximum inrush current (10 ms): 10 × rated operating current - Dielectric withstand voltage: 2500 VAC (1 minute) - Insulation resistance: 100 MΩ - Operating temperature range: –35 °C to +75 °C - Power frequency: 50/60 Hz - Thermal management: 25 A rating requires heatsink; 40 A rating requires heatsink plus forced air cooling - Load current safety factor: 50% for resistive loads, 30% for inductive loads; derating recommended for frequent switching or harsh environments - Dimensions: 65.5 mm (L) × 45.0 mm (W) × 23.5 mm (H)