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

    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.
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    Delivery date: 6-20 days

    Solid State Relay Features

    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 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

    120 Amps 3 Phase SSR Specification

    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 Dimension L – W – H (mm) 105х74х33
    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 added to the SSR or the SSR should be mounted on a metal base plate with heat dissipation effect, and apply the thermal grease between them. 
    When the load current is higher than is 40A or more, it also needs to add fan cooling or water cooling.

    Heat Sink for 3 Phase SSR

    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

    Solid State Relay Dimension

    3 phase SSR dimensions

    Three Phase SSR Wiring Diagram

    3-phase SSR wiring diagram 3-32VDC

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

    Taking into account fluctuations in grid voltage and large instantaneous current when load starts, the current of solid state relays (SSRs0 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
      The solid state relay (SSR) 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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