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    Solid state relay, 3 phase, SSR-25AA, 25A 70-280V AC to AC

    5 out of 5 based on 2 reviews | Write a review
    25 Amp 3-phase solid state relay, SSR-25AA, input voltage 70-280V AC, load voltage 24-480V AC, LED indicator, panel mount, excellent quality and brand new, general purpose SSR relay for wide applications.
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    Delivery date: 6-12 days


    25 Amp 3-phase solid state relay (SSR) can control 24-480V AC via 70-280V AC with high structural strength, good impact resistance, and strong shock resistance. The SSR offers a reliable switching the commercial and industrial loads, such as computer peripheral interface device, printing machine, molding machine, food machine, packaging machine, and so on.

    • Built in RC absorption
    • Photoelectric isolation
    • SCR output
    • LED indicator for operation status
    • Removable protective cover for safety
    • Panel mount
    • Zero-crossing switch type


    Model ATO-SSR-TH25AA
    Input Control voltage range 70-280V AC
    Max. input current 20mA
    Must operate voltage 70V AC
    Must release voltage 50V AC
    Output Load voltage range 24-480V AC
    Peak voltage 800V AC
    Maximum load current 25A
    Maximum off-state leakage current 8mA
    Maximum off-state time 10mS
    Maximum on-state voltage drop 1.5V
    General Type AC to AC, 3 phase
    Dimension L – W – H (mm) 105х74.8х33
    Weight 500g
    Dielectric strength (input to output) 4000V
    Dielectric strength (input, output to the base) 2500V
    Operating temperature -20℃~ 80℃
    Mount Panel
    Certification CE


    1. When the load is a resistive load, the maximum load current of the selected SSR should be 2~3 times greater than the actual load current;
    2. When the load is an inductive load, the maximum load current of the selected SSR should be more than 7~8 times the actual load current.
    3. When the maximum load current is higher than 10A, a heat sink must be installed to the solid state relay, or the SSR relay should be mounted on a metal base plate with heat dissipation effect, and the thermal grease is applied between them.

    Dimensions (Unit: mm)

    3-phase SSR Relay Dimensions

    Wiring Diagram

    3-phase 70-280V AC to AC SSR Wiring Diagram

    Tips: Advantages of solid state relay over AC contactors

    1. In the first place, solid state relay have a long life and high reliability. solid state relays do not have mechanical components, and use solid state devices to complete the contact function. Because there is no movement of those components, they can work in an environment full of high impact and vibration. Inherent characteristics of SSRs’ components determine their long life and high reliability. However, poor contact failure and then burned contactors may be caused by coils which are used by AC contactors to control magnetic drawing for the purpose of contacts’ connection or disconnection.

    2. Solid state relays have good sensitivity, low control power and good electromagnetic compatibility. The SSR has a wide input voltage range and low drive power, which makes it compatible with most logic integrated circuits without a buffer or driver.

    3. Solid state relays have fast conversion. Because solid state relays adopt solid state components, their switching speed can be from a few milliseconds to a few microseconds, and the conversion speed is very fast; and AC contactors’ drawing is controlled through coils, so the conversion speed is a few tenths of seconds, slow relative to solid state relays.

    4. Solid state relays have small electromagnetic interference. Because there is no input coil in SSRs, no contact striking and bound, electromagnetic interference is reduced. Most AC-output solid state relays are zero-voltage switches that turn on at zero voltage and turn off at zero current, which reduces sudden interruption of the current waveform and thus reduce switching transient effects. However, the contactor’s electromagnetic interference is larger.

    5. Solid state relays are small while contactors are large in volume. It is not convenient for contactors to be installed in some relatively narrow space while SSRs may come in convenient. Nevertheless, solid state relays do not have that large current generally, but contactors do.

    6. Solid state relays can have various voltage conversions, such as AC to AC, AC to DC, DC to DC, etc. Contactors can not be so flexible.

    Existing reviews of Solid state relay, 3 phase, SSR-25AA, 25A 70-280V AC to AC
    Could you recommend SSR we need?
    Can you please help me with the below?
    Need a part number, pricing, and availability
    50A SSR
    25A SSR
    The load voltage is 208
    The control voltage is 208
    Quantity – 2 each
    From: antony | Date: 20/07/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    We can provide 25A and 60A, please refer to these two SSRs.
    Great solid state relays
    Bought 4 of these solid state relays for switching on/off a heating element. Easy to setup with clear instructions. I have had no problems with these. Would buy again.
    From: Morgan | Date: 17/12/2018
    Was this review helpful? Yes No (0/0)
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