SSR-40DA SSR Solid State Relay Module

SSR-40DA Solid State Relay Module (40A, DC to AC Control)

The SSR-40DA Solid State Relay Module is a high-performance, non-contact switching device designed for safely controlling high-voltage AC loads using a low-voltage DC signal. Built for reliability and long service life, this solid state relay is ideal for industrial automation, temperature control systems, CNC machines, 3D printers, and other electronic control applications.

Unlike traditional mechanical relays, the SSR-40DA uses solid state electronics with no moving parts, ensuring silent operation, faster switching speeds, and improved durability. The built-in zero cross trigger control minimizes electrical noise and reduces inrush current, making it perfect for sensitive equipment and stable load switching.

This terminal-type relay allows you to safely control 24V to 380V AC circuits using a 4V to 32V DC input, protecting both the user and connected equipment from electrical hazards while enabling remote and automated operation.

Key Features

• High current capacity: Supports loads up to 40 Amps
• Wide input range: 4V—32V DC control signal
• AC load switching: 24V—380V AC output
• Zero cross triggering for reduced electrical interference
• Fast switching response for precision control
• Fully isolated design for enhanced safety
• Durable solid state construction (no mechanical wear)
• Compact terminal-type housing for easy installation

Technical Specifications

• Model: SSR-40DA (Terminal Type)
• Input Voltage: 4V — 32V DC
• Output Voltage: 24V — 380V AC
• Rated Load Current: 40A
• Minimum Switching Voltage:
  • ON: > 2.4V
  • OFF: < 1.0V
• Trigger Current: 12mA
• Control Method: Zero Cross Trigger
• Response Time: 8.3ms (at 60Hz)
• Operating Temperature: -40C to +80C
• Dielectric Strength: > 2KV AC (1 minute)
• Isolation Resistance: > 100M (500V DC)

Applications

The SSR-40DA Solid State Relay is widely used in:

• Industrial automation systems
• Temperature control (heaters, ovens, incubators)
• 3D printers and CNC machinery
• Lighting control systems
• Motor and pump switching
• PLC and microcontroller-based projects (Arduino, ESP32, etc.)

Why Choose the SSR-40DA?

The SSR-40DA offers a safe, efficient, and long-lasting alternative to mechanical relays. Its ability to switch high-power AC loads using a low-voltage DC signal makes it ideal for both professional and DIY electronics projects. With built-in protection features and reliable performance, it ensures stable operation in demanding environments.