(0) Shopping cart
You have no items in your shopping cart.
Shopping Categories

    Solid state relay SSR-25DA, 25A 3-32V DC to AC

    5 out of 5 based on 3 reviews | Write a review
    Low price SSR-25DA, single phase solid state relay, DC control, 3-32V DC input voltage, 25A load current, 24-480V AC load voltage, quality and reliable, best for commercial and industrial applications.
    30-day Returns
    Free Shipping
    Delivery date: 6-12 days


    25A solid state relay (SSR), 3-32V DC input and 24-480V AC output, features compact size, 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-DH25DA
    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 25A
    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 100g
    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: How to protect solid state relay (SSR)?

    1. Overcurrent protection
      SSR is a semiconductor power device that is extremely sensitive to temperature changes. Overcurrent may cause damages to it. Therefore, a fast acting fuse is usually used. But it is necessary to understand its protection features, to know the relationship between fuse current and time, and to correctly choose the fast acting fuse compatible with nominal current of SSR.
    2. RC absorption circuit
      RC absorption circuit. The use of RC circuit not only prevents over-voltage, but also improves dv/dt. The recommended R is 20-100Ω, the power 2-5W, C 0.1-0.47uf, and the withstand voltage is 250-630V. If SSR has lower nominal current, R adopts its upper limit 100Ω and C adopts its lower limit 0.1uf. Otherwise, R adopts its lower limit and adopts its upper limit.
    3. Overheat protection
      Overheated SSRs' characteristics may compromise, ranging from the loss of control to permanent damage. It is recommended to install a temperature control switch near the SSR baseplate with temperature control point at 75 to 80 ℃.
    4. Series inductance L in inductor load
      In the inductive load, SSR is usually damaged due to high rate of current di/dt. The inductance value of L depends on the size and cost level.

    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-25DA, 25A 3-32V DC to AC
    Control line-level baseboard heater
    I've been using this 25A solid state relay as part of a circuit to control some line-level baseboard heaters. No problems so far. Be sure to install the appropriate heat sink and use thermal paste.
    From: Barrel | Date: 10/11/2022
    Was this review helpful? Yes No (0/0)
    Solid state relay ssr 25da vs. ssr 25aa
    What is the difference between the ssr 25da and the ssr 25aa?
    From: Dixon | Date: 25/07/2019
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The solid state relay SSR-25DA is for direct current and SSR-25AA is for alternating current. For more details about SSR-25AA, please check this link:
    This is a great solid state relay.
    This is a great solid state relay. I used it for electric heater and works as expected. It would be much better if it could come with a heatsink. Good unit.
    From: Jason | Date: 25/01/2019
    Was this review helpful? Yes No (0/0)
    Load more reviews...
    Write your review for Solid state relay SSR-25DA, 25A 3-32V DC to AC
    • Only registered users can write reviews
    • Bad
    • Excellent
    Customers who bought this item also bought

    5 hp VFD, Single Phase to Three Phase VFD

    SKU: GK3000-2S0037
    5hp variable frequency drive, single phase to three phase VFD, 17 amps, RS485 enabled, shipping weight 4kg, manufacturer direct sale.