5-32VDC/5-60VDC SSR-40dd Single Phase Solid State Relay

Specification

• Product Name: Solid State Relay (SSR)

• Model Number: SSR-40DD

• Relay Type: DC to DC Solid State Relay

• Control Type: DC Input, DC Output

• Phase: Single Phase

• Switching Mode: Zero-Crossing / Random Turn-On (variant dependent)

Input (Control) Specifications

• DC Practical Voltage : up to 5– 32V

• Trigger Voltage (Turn ON): ≥5V DC

• Turn OFF Voltage: ≤1V DC

• Input Type: Optically isolated (photovoltaic coupler)

• Input Terminals: Screw terminals (marked “+” and “−”)

Output (Load) Specifications

• Load Voltage Range: 5 – 60V DC

• Maximum Load Current: 40A continuous

• Output Type: Normally Open

• Output Device: MOSFET / IGBT (internal)

• Voltage Drop (On-state): ≤1.5V @ full load

• Leakage Current (Off-state): ≤2mA @ rated voltage

• Switching Time:

  • Turn ON: ≤1ms

  • Turn OFF: ≤1ms

• Surge Current Capacity: Up to 2× rated load for short duration

• Output Terminals: Screw terminals for +/− DC output

Mechanical Specifications

• Dimensions (L×W×H): 57mm × 45mm × 23mm (Approx.)

• Mounting Type: Panel Mount with M4 Screws (4 slots)

• Housing Material: Flame-retardant ABS or Polycarbonate resin

• Weight: ~110g

• Heat Sink: Required for full load operation (Not included unless specified)

• Terminal Type: Screw clamp terminals for wire sizes up to 10 AWG

Performance & Protection

• EMC Compliance: Optional filter circuitry for noise immunity

• Protection Features (may vary by version):

  • Overvoltage protection (external circuit advised)

  • Overcurrent protection (external fuse or breaker recommended)

  • Reverse polarity protection (on some variants)

Application & Use Cases

• Typical Applications:

  • DC motor switching

  • Industrial automation systems

  • PLC-controlled equipment

  • Battery-operated loads

  • Solar charging/discharging control

  • DC power distribution systems

  • Smart Home Automation (DC lighting, fans, pumps)

• Compatible Loads:

  • Resistive and inductive DC loads

  • LED strips, DC fans, solenoids, etc.

• Control Sources:

  • Microcontrollers (Arduino, ESP32, STM32)

  • PLCs

  • Digital logic circuits