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

    SSR-25AA, single phase solid state relay, zero cross, load current rating 25 amp, AC control voltage 70-280V AC, load voltage 24-480V AC, panel mount, strong structure and high reliability.
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    Delivery date: 6-12 days


    25A 70-280V AC to AC solid state relay (SSR) features 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-SYDH2548ZA2
    Input Control voltage range 70-280V AC
    Max. input current 15mA
    Must operate voltage 70V AC
    Must release voltage 50V AC
    Output Load voltage range 24-480V AC
    Peak voltage 800V AC
    Load current 25A
    Maximum off-state leakage current 2mA
    Maximum off-state time 10mS
    Maximum on-state voltage drop 1.5V
    General Type AC to AC, single phase
    Dimension L – W – H (mm) 57.4х44.8х28
    Weight 100g
    Dielectric strength (input to output) 4000V
    Dielectric strength (input, output to the base) 2500V
    Operating temperature -20℃~ 80℃
    Mount Panel
    Certification CE

    * When the 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. When the load current is 40A or more, a fan cooling radiator or water cooling radiator must be equipped.
    * Heat sink is Not included.

    Dimension (Unit: mm)

    Single Phase SSR Dimensions

    Wiring Diagram

    Single Phase AC to AC SSR Wiring DiagramTips: Solid state relays' advantages and disadvantages

    Solid state relays work reliably and have a long life, no noise, no spark, no electromagnetic interference, fast switching speed, strong anti-interference ability, and small size, impact resistance, vibration resistance, anti-explosion, moisture proof, corrosion resistance, compatibility with logic circuits such as TTL, DTL, HTL. They can directly drive high-current load with tiny control signals.

    The main disadvantage is the existence of on-state voltage drop (corresponding cooling measures needed), off-state leakage current, common use in AC and DC conditions, fewer contact sets, as well as poor indicators including overcurrent and overvoltage and voltage rise rate, current rise rate, etc.

    Solid state relay (SSR) is simple but widely used in the automation fields. Thus, it is not complex to wire a solid state relay. In this vedio, ATO takes a 40 Amp SSR (DC - AC) for example to show the wiring of a SSR and then switch on/off a motor with this SSR.

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