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

    5 out of 5 based on 3 reviews | Write a review
    Low price 3-phase solid state relay SSR-120DA, load current 120 Amp, zero cross, DC to AC, 3-32V DC control voltage, 24-480V AC load voltage, with LED indicator, panel mount, strong structure and excellent quality.
    Free Shipping Worldwide
    Delivery date: 6-12 days


    120A 3-32V DC to 24-480V AC 3-phase solid state relay (SSR) features compact size, high structural strength, good impact resistance, and strong shock resistance. The SSR relay offers a reliable switching 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-SYTH12048ZD3
    Input Control voltage range 3-32V DC
    Max. input current 20mA
    Must operate voltage 4V DC
    Must release voltage 2.7V DC
    Output Load voltage range 24-480V AC
    Peak voltage 800V AC
    Load current 120A
    Maximum off-state leakage current 8mA
    Maximum off-state time 10mS
    Maximum on-state voltage drop 1.5V
    General Type DC 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

    When the 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.
    When the load current is 40A or more, a fan cooling radiator or water cooling radiator must be equipped.

    Heat Sink

    Product Name Heat sink for 3 phase SSR SSR 150Amp heat sink dimension
    Material Aluminum alloy
    Dimension (L*W*H) 150*125*135mm
    Mounting Size Mounting Hole Diameter: 3mm
    Groove Distance: 84mm
    Weight 2.1kg
    Application ≤150A 3 phase solid state relay

    Dimensions (Unit: mm)

    3-phase SSR Relay Dimensions

    Wiring Diagram

    3-phase 3-32V DC to AC SSR Wiring Diagram

    Tips: How to choose the current of solid state relay?

    Taking into account the fluctuations in grid voltage and large instantaneous current when the load starts, the current of solid state relays (SSR) 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 SSR, appropriate margin should be left.

    1. Resistive load
      The SSR relay 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.
    Existing reviews of Solid state relay, 3 phase, SSR-120DA, 120A 3-32V DC to AC
    To run AC 120A heater via your solid state relay
    Hello! What is recommended solid state relay capacity to run AC 120A heater?
    From: Jane | Date: 03/12/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Jane. The recommended solid state relay has to be 350A. Please check this link:
    A heater running 3 phase each phase 110A
    heater running 3 phase each phase 110A, can use 3 phase 120A SSR 120DA ? or any recommended ?
    From: jaycee | Date: 28/09/2021
    Was this review helpful? Yes No (0/0)
    heater max load each phase 110A
    3 phase heater max load for each phase is 110A, so can we use SSR 120DA ?
    From: jaycee | Date: 28/09/2021
    Was this review helpful? Yes No (0/0)
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