Best Seller SSR-25AA AC to AC Solid State Relay
SSR-25AA solid state relay module with AC input and output terminals isolated on a white background.
SSR-25AA solid state relay wiring diagram showing input and output terminals with AC power supply and load connections.
SSR-25AA solid state relay with copper terminal outputs and heat-dissipating metal back plate.
Two SSR-25AA solid state relays shown from front and bottom angles with technical specifications.
Collage showing various industrial and electronic applications for the SSR-25AA solid state relay.
SSR-25AA solid state relay module shown in a close-up product view with installation context.
Couple relaxing on a sofa using a remote control for a wall-mounted air conditioner unit.
SSR-25AA solid state relay module with AC input and output terminals isolated on a white background.
SSR-25AA solid state relay wiring diagram showing input and output terminals with AC power supply and load connections.
SSR-25AA solid state relay with copper terminal outputs and heat-dissipating metal back plate.
Two SSR-25AA solid state relays shown from front and bottom angles with technical specifications.
Collage showing various industrial and electronic applications for the SSR-25AA solid state relay.
SSR-25AA solid state relay module shown in a close-up product view with installation context.
Couple relaxing on a sofa using a remote control for a wall-mounted air conditioner unit.

SSR-25AA AC to AC Solid State Relay

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$10.79
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$10.79
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SSR-25AA Solid State Relay

Key Features

  • Model: SSR-25AA
  • Type: Single-Phase AC-to-AC Solid State Relay
  • Control Input Voltage: 80-250V AC
  • Load Output Voltage: 24-380V AC
  • Maximum Load Current: 25A
  • Switching Method: Zero-crossing trigger
  • Operation: Silent, no-spark, high-speed switching
  • Construction: Features an integrated metal baseplate for heat dissipation
  • Dimensions: 5.8 x 4.5 x 2.2 cm

Replaces / Cross-Reference Part Numbers

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

Compatibility & Fitment

  • Designed for general purpose AC load switching in industrial automation, process control systems, and machinery.
  • Compatible with control circuits providing an 80-250V AC signal.
  • Suitable for resistive and inductive AC loads up to 25A within a 24-380V AC voltage range.
  • Requires a heat sink (not included) for operation near maximum rated current to prevent thermal damage.

When to Replace

  • The connected load circuit remains permanently on or off.
  • Relay fails to activate when control voltage is applied.
  • Intermittent or unreliable switching performance.
  • Visible signs of overheating, melting, or physical damage to the housing.

Installation Tips

  • Disconnect all power to the circuit before installation or removal.
  • Ensure correct wiring for input (control) and output (load) terminals.
  • Apply a thin layer of thermal compound between the relay's metal base and the mounting heat sink.
  • Securely fasten the relay to a heat sink appropriately sized for your specific load current.
  • Verify that the control signal and load voltage/current are within the specified ratings of the relay.
SSR-25AA AC to AC Solid State Relay 1
SSR-25AA AC to AC Solid State Relay 2
SSR-25AA AC to AC Solid State Relay 3
SSR-25AA AC to AC Solid State Relay 4
  • SSR-25AA AC to AC Solid State Relay 1

    Perfect fit

    Diverse applications in controlling computer peripherals, AC motors, lighting systems, spanning automation setups to enhance security and performance
  • SSR-25AA AC to AC Solid State Relay 2

    Premium quality

    This product adopts a heat-dissipating metal back plate and a copper terminal lug for superior conductivity.
  • SSR-25AA AC to AC Solid State Relay 3

    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
  • SSR-25AA AC to AC Solid State Relay 4

    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

Compatible Models

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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)

FAQs

The SSR-25AA is designed for AC-to-AC switching. It accepts a control input voltage range of 70-280VAC and handles a load voltage range of 24-480VAC.
This relay is rated for a maximum load current of 25 Amps. Ensure your application load does not exceed this rating to prevent thermal failure.
Yes. While the SSR-25AA features an aluminum backplate for heat dissipation, a dedicated heat sink is highly recommended for applications operating near the 25A limit. Proper thermal management is essential to prevent the internal triac from overheating and failing.
A failed solid state relay typically presents in one of two ways: it will either fail 'open,' meaning it will no longer energize the load even when the control signal is present, or it will fail 'closed,' meaning the load remains powered on continuously regardless of the control signal status.
No. The SSR-25AA is specifically an AC-to-AC relay. If you are using a DC control signal (such as 3-32VDC), you must use a DC-to-AC relay (often designated as SSR-25DA) instead.
The SSR-25AA is designed for panel mounting. It features two mounting holes that allow it to be securely fastened to a chassis or heat sink using standard screws.