SSR-40DA Solid State Relay - Pack of 2

Key Features

• Package Contents: 2 solid state relays
• Model: SSR-40DA
• Control Method: DC to AC
• Input Voltage: 3-32V DC
• Load Voltage: 24-380V AC
• Load Current: 40A
• Switching Mechanism: Electronic, no mechanical parts
• Trigger Type: Zero-cross
• Connections: 4 screw terminals for input and output

Replaces / Cross-Reference Part Numbers

• SSR-40DA

Compatibility & Fitment

• General-purpose component for controlling high-current AC loads with a low-voltage DC signal.
• Suitable for automatic control systems, including temperature controllers, HVAC systems, and industrial machinery.

When to Replace

• Relay fails to activate when input voltage is applied.
• Relay remains stuck in the "ON" position, even with no input voltage.
• Intermittent or unreliable switching of the AC load.
• Visible signs of damage, overheating, or melting on the relay housing.

Installation Tips

• Disconnect all power to the system before installation.
• A heat sink is recommended for loads approaching the 40A rating to ensure proper heat dissipation.
• Ensure all screw terminals are securely fastened to prevent arcing.
• Verify that the wire gauge used is appropriate for the electrical load.
• Confirm input and output connections are correct before applying power.