[Lifetime Warranty] SSR-40DA DC to AC Solid State Relay | Pack of 2
Two SSR-40DA solid state relays with 3-32VDC input and 24-380VAC output terminals.
SSR-40DA solid state relay wiring diagram showing AC load and DC input connections.
Single SSR-40DA solid state relay with copper terminal outputs and heat-dissipating metal back plate.
Two SSR-40DA solid state relays showing front and back views with terminal screws and technical specifications.
Collage showing industrial electrical control panels, solar panels, and circuit boards for SSR-40DA solid state relay.
SSR-40DA solid state relay shown in a close-up product installation graphic.
Couple relaxing on a sofa using a remote to control a wall-mounted air conditioner unit.
Two SSR-40DA solid state relays with 3-32VDC input and 24-380VAC output terminals.
SSR-40DA solid state relay wiring diagram showing AC load and DC input connections.
Single SSR-40DA solid state relay with copper terminal outputs and heat-dissipating metal back plate.
Two SSR-40DA solid state relays showing front and back views with terminal screws and technical specifications.
Collage showing industrial electrical control panels, solar panels, and circuit boards for SSR-40DA solid state relay.
SSR-40DA solid state relay shown in a close-up product installation graphic.
Couple relaxing on a sofa using a remote to control a wall-mounted air conditioner unit.
Lifetime Warranty

[Lifetime Warranty] SSR-40DA DC to AC Solid State Relay | Pack of 2

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SSR-40DA Solid State Relay

Key Features

  • 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.
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  • Perfect fit

    Perfect fit

    Diverse applications in controlling computer peripherals, AC motors, lighting systems, spanning automation setups to enhance security and performance
  • Premium quality

    Premium quality

    This product adopts a heat-dissipating metal back plate and a copper terminal lug for superior conductivity.
  • Saving solution

    Saving solution

    Enjoy the great feeling when your engine is repaired and works properly like before - BlueStars brings DIY solutions to help you deal with any trouble
  • Simple installation

    Simple installation

    Solid State Relay is a simple part & just takes few minutes to install and will save you at least a hundred bucks in labor.
BRINGING RELIABILITY TO THE SWITCH

BRINGING RELIABILITY TO THE SWITCH

Model
‎SSR-25AA
Control method
‎AC to AC
Control (Input) Voltage
‎80-250VAC
Load (Output) Voltage
‎24-380VAC
Min Control Current
‎3MA
Max Control Current
‎35MA
Current & Frequency
‎25A
Insulation Resistance
‎1000M Ohm/500VDC
Off Leakage Current
‎≤5mA
On Voltage
‎≤1.6V
On-off-Time
‎≤10ms
Ambient Temperature
‎~30~+70℃
Relative Humidity
‎40-50% (Non-condensing)

FAQ

This relay is designed for a 3-32V DC input control voltage and handles an output load of 24-380V AC, with a maximum current capacity of 40A.
A failed SSR typically fails in one of two ways: it either stays 'stuck' in the ON position, causing the load to run continuously regardless of the input signal, or it fails to trigger at all, leaving the load without power even when the control signal is active.
Yes. Solid state relays generate heat during operation. To prevent thermal failure and ensure the longevity of the component, you should mount the relay to an appropriately sized aluminum heat sink, preferably using thermal paste between the relay base and the heat sink surface.
No. The SSR-40DA is specifically engineered for AC load switching. Attempting to use this model for DC loads will result in the relay failing to turn off once activated.
Installation requires basic wiring skills. You will need to connect your DC control signal to the input terminals (3 and 4) and wire your AC load in series with the output terminals (1 and 2). Ensure all connections are tight to prevent arcing and heat buildup at the terminals.