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    Solid state relay SSR-40DA, 40A 3-32V DC to AC

    5 out of 5 based on 2 reviews | Write a review
    Brand new solid state relay 40A, zero cross, control voltage 3-32V DC, load voltage 24-480V AC, LED indicator, panel mount, low cost and high quality, ideal SSR for automatic process control applications.
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    Delivery date: 6-12 days


    40 amps 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-SSR-DH40DA
    Input Control voltage range 3-32V DC
    Max. input current 12mA
    Must operate voltage 2.8V DC
    Must release voltage 1.5V DC
    Output Load voltage range 24-480V AC
    Peak voltage 800V AC
    Maximum load current 40A
    Maximum off-state leakage current 2mA
    Maximum off-state time 10mS
    Maximum on-state voltage drop 1.5V
    General Type DC to AC, single phase
    Dimension L – W – H (mm) 57.4х44.8х28
    Weight 135g
    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.

    Dimension (Unit: mm)

    Single Phase SSR Dimensions

    Wiring Diagram

    Single Phase DC to AC SSR Wiring Diagram

    Tips: Solid state relay has advantages over EMR relay

    Solid state relay (SSR) is a new type of non-contact switch composed of solid state electronic components, and achieve the purpose of connecting and disconnecting circuits without contact and sparking by virtue of those electronic components (such as switching transistors, triacs and other semiconductor components). Therefore, it is also known as non-contact switch.

    Compared with the previous Electromechanical Relay (EMR), the SSR has no moving mechanical parts and no mechanical actions during its operation. It has advantages over EMR, such as fast response, high reliability, long life (SSR’s on-off times are a hundred time more than those of average EMR by 106 times), no noises, shock-proof, mechanical shock resistance, good moisture-proof and mildew-proof, anti-corrosion characteristics. These features make SSR widely used in military science, chemical industry as well as various industrial and civil electric control devices.

    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.

    Existing reviews of Solid state relay SSR-40DA, 40A 3-32V DC to AC
    Solid state relay - 40 amps, worked perfectly
    I bought a SSR for my Arduino with other 5V microcontroller output to control lights. The indicator LED is useful to check that the working state of the SSR. It is easy to wire up and the screw terminals work nicely with either bare wire or spade connecters. Worked perfectly without any troubles.
    From: Milan | Date: 15/04/2019
    Was this review helpful? Yes No (0/0)
    This solid state relay works well.
    Bought a 40A solid state relay, DC to AC. After I received it, I connected this SSR to a motor for a test. The SSR and the motor worked. Cool!
    From: Kevin | Date: 26/09/2018
    Was this review helpful? Yes No (0/0)
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