[Lifetime Warranty] SSR-25AA AC to AC Solid State Relay | Pack of 2
Two SSR-25AA solid state relay modules with screw terminals and 24-380VAC output rating.
SSR-25AA solid state relay wiring diagram showing input and output connections for AC power supply and load.
Single SSR-25AA solid state relay with copper terminal outputs and heat-dissipating metal back plate.
Two SSR-25AA solid state relays showing front and bottom views with technical specifications.
Collage showing industrial electrical control panels, solar panels, and circuit boards for SSR-25AA solid state relay use.
SSR-25AA solid state relay module shown in a close-up product image with installation context.
Couple relaxing on a sofa using a remote control to operate a wall-mounted air conditioner.
Two SSR-25AA solid state relay modules with screw terminals and 24-380VAC output rating.
SSR-25AA solid state relay wiring diagram showing input and output connections for AC power supply and load.
Single SSR-25AA solid state relay with copper terminal outputs and heat-dissipating metal back plate.
Two SSR-25AA solid state relays showing front and bottom views with technical specifications.
Collage showing industrial electrical control panels, solar panels, and circuit boards for SSR-25AA solid state relay use.
SSR-25AA solid state relay module shown in a close-up product image with installation context.
Couple relaxing on a sofa using a remote control to operate a wall-mounted air conditioner.
Lifetime Warranty

[Lifetime Warranty] SSR-25AA AC to AC Solid State Relay | Pack of 2

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SSR-25AA Solid State Relay

Key Features

  • Model: SSR-25AA
  • Type: Single Phase Solid State Relay (AC to AC)
  • Control Input Voltage: 80-250V AC
  • Load Output Voltage: 24-380V AC
  • Maximum Load Current: 25A
  • Switching Method: Electronic, non-mechanical for high-speed operation
  • Construction: Features an integrated aluminum heat-dissipating base plate

Replaces / Cross-Reference Part Numbers

  • SSR-40AA
  • RM1A23A25
  • RA2425D
  • D2425-10
  • RN1A23D25
  • 240A25
  • SSR-25AA-H
  • S2225X
  • 25A-H3-380VAC
  • RJ1A48D25

Compatibility & Fitment

A general-purpose component for switching AC electrical loads. Suitable for applications within its specified voltage and amperage ratings, including:

  • Industrial automation and process control
  • Programmable Logic Controller (PLC) interface
  • Heating element and motor control
  • Lighting systems

When to Replace

  • Relay fails to activate the load circuit when control voltage is applied.
  • Relay remains in the "on" state, continuously powering the load circuit regardless of control voltage.
  • Intermittent or unreliable switching performance.
  • Visible signs of damage or overheating on the relay housing or terminals.

Installation Tips

  • Disconnect all power sources before installation or servicing.
  • A heat sink is required for reliable operation with loads exceeding 10A to prevent thermal failure.
  • Apply a thin layer of thermal compound between the relay's metal base and the heat sink surface.
  • Ensure all wire connections to the screw terminals are secure to prevent poor contact and overheating.
  • Verify that your application's control and load voltages are within the specified ranges for this relay.
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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

Color
White
Material
Plastic / Metal
Relay Type
AC to AC (AA) — Zero-Cross Trigger, Single Phase
Input Voltage
80–250V AC
Output Voltage
24–380V AC
Output Current
25A
Frequency
50/60Hz
Turn-Off Time
≤20ms
Off-State Leakage Current
≤5mA
On-State Voltage Drop
≤1V
Insulation Resistance
1000MΩ @ 500V DC
Working Temperature
-30°C to +70°C
Dimensions (L x W x H)
~60 x 45 x 23mm (~2.36" x 1.77" x 0.91")
Item Weight
~73g (~0.16 lbs)

FAQ

This relay is designed for AC-to-AC control. It features a control voltage (input) of 80-280V AC and a load voltage (output) of 24-480V AC, with a maximum load current of 25A.
A failed relay will typically either stay stuck in the 'on' position, causing the load to run continuously regardless of the control signal, or fail to close the circuit entirely, preventing the load from receiving power. If you notice your heater or motor is not cycling off or failing to start despite receiving a signal, the relay is a likely point of failure.
Yes. Solid-state relays generate heat during operation. To prevent thermal breakdown and ensure a long service life, you must mount these relays to an appropriate aluminum heat sink using thermal paste or a thermal pad, especially if you are operating near the 25A current limit.
The 'AA' designation indicates an AC-controlled AC relay, meaning it requires an AC voltage signal to trigger the output. An 'DA' model, by contrast, is a DC-controlled AC relay, which uses a low-voltage DC signal (typically 3-32V DC) to switch the AC load. Ensure your control circuit matches the 'AA' input requirement before installation.
Ensure that the load is connected in series with the output terminals (1 and 2) and that your control signal is connected to the input terminals (3 and 4). Always verify that your load current does not exceed 25A and that you are using appropriately sized wire gauge for the current draw to prevent overheating at the terminals.