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    Solid state relay, 3 phase, SSR-120DA, 120A 3-32V DC to AC

    3-phase Solid State Relay SSR-120DA 120A, DC-AC, Input 3-32V DC Output 24-480V AC, excellent quality, high reliability, good performance, long life and widely applied in the field of automatic control.
    SKU: ATO-TH12048ZD3

    Solid State Relay, 3 phase, load current 120A, DC control, zero-cross switch, built-in RC, optical isolation between input and out circuit, with LED indicator, no electric spark, no noise and no contact, high switching speed, high structural strength, impact resistance, anti-vibration.


    Basics Model ATO-TH12048ZD3
    Size 105(L)х74(W)х33(H)mm
    Weight 500g
    Mounting method Bolted
    Ambient temperature -20℃~75℃
    Humidity ≤95%(non-condensing)
    Technical parameters Control mode DC-AC
    Load voltage 24~480V AC
    Load current 120A
    Control voltage 3~32V DC
    Control current 10-68mA
    On-state voltage drop ≤1.5V AC
    Off-state leakage current ≤10mA
    Off-state time ≤10ms
    Dielectric strength 2500V AC (1min)
    Insulation resistance 500МΩ with 500V DC
    LED indication YES
    Cooling Fan needed for cooling


    3 phase SSR dimensions

    Wiring diagram

    3-phase SSR wiring diagram 3-32VDC

    Tips: How to choose the current of SSRs?

    Taking into account fluctuations in grid voltage and large instantaneous current when load starts, the current of SSRs is generally several times larger than its rated current, and thyristor chip’s resistance to current impact is poor, it is recommended in the selection of the current of SSRs, appropriate margin should be left.

    1. Resistive load
      SSRs’ nominal current should be twice as large as the rated load current.
    2. Inductive load
      The nominal current should be 2.5 times as large as the rated current of the load for light load; 3 times for middle-sized load; and 4 ~ 4.5 times for heavy load.
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