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    Solid state relay, 3 phase, SSR-40AA, 40A 70-280V AC to AC

    Favorable price SSR-40AA solid state relay with 40 amp load current, 3 phase SSR, 70-280V AC control voltage, 24-480V AC load voltage, zero cross, LED indicator, compact size and excellent quality.
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    Delivery date: 6-12 days


    40A 3-phase solid state relay (SSR) with 70-280V AC to 24-480V AC 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-SSR-TH40AA
    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 40A
    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: Over-current protection of solid state relay

    Solid state relays (SSR) take semiconductor switching devices as power output components, and are sensitive to temperature changes. Over-current may overheat semiconductor chips, which results in there decreased quality, life expectancy reduction or even permanent damage. Although solid state relays (SSRs) in an instant can withstand surge current 10 times larger than the rated current, but permanent damages are likely to be caused if the current is more than such a value. Therefore, over-current protection is very important. There are many ways for over-current protection. The key is to fast response. For AC solid state relay with SCR as output devices, general protection circuits are invalid due to current zero required by SCR’s turn-off if the surge current and short-circuit current are larger than SSR’s surge current within 10 Ms (50Hz). At this moment, fast acting fuses exclusive for semiconductor devices. Fuses’ nominal fusing current should not exceed the nominal current value of the SSR. There are a variety of commercial fuses, but their quality is different. Therefore, pay attention when choosing fuses.

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