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

    SSR-25DA, single phase Solid State Relay, 25A, 3-32V DC Input to 24-480V AC Output, suitable for frequent switching occasion, and anti-corrosion, moisture-proof, anti-vibration.
    SKU: ATO-DH2548ZD3

    Solid State Relay, load current 25A, DC control, equipped with LED indicator, zero-crossing switch, built-in RC, excellent quality and high reliability.


    Basics Model ATO-DH2548ZD3
    Size 57.4х44.8х28mm
    Weight 100g
    Mounting method Bolted
    Ambient temperature -20℃~75℃
    Humidity ≤95%(non-condensing)
    Technical parameters Control mode DC-AC
    Load voltage 24~480V AC
    Load current 25A
    Control voltage 3~32V DC
    Control current DC 3-25mA
    On-state voltage drop ≤1.5V
    Off-state leakage current ≤2mA
    Off-state time ≤10ms
    Dielectric strength 2500V AC (1min)
    Insulation resistance 500МΩ with 500V DC
    LED indication YES
    Cooling Heat sink or fan is needed for cooling.


    SSR single phase dimensions

    Wiring diagram

    SSR single phase wiring dc ac

    Tips: How to protect 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.
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