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    Solid state relay, 3 phase, SSR-120AA, 120A 70-280V AC to AC

    5 out of 5 based on 1 reviews | Write a review
    Favorable price SSR-120AA solid state relay, 3 phase, 120 amp load current, 70-280V AC control voltage, 24-480V AC load voltage, zero-crossing switch, LED indicator, panel mount, high quality and long life time.
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    Delivery date: 6-12 days


    120A Three-phase solid state relay (SSR) with 70-280V AC control 24-480V AC features 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-TH120AA
    Input Control voltage range 70-280V AC
    Max. input current 20mA
    Must operate voltage 70V AC
    Must release voltage 50V AC
    Output Load voltage range 24-480V AC
    Peak voltage 800V AC
    Maximum load current 120A
    Maximum off-state leakage current 8mA
    Maximum off-state time 10mS
    Maximum on-state voltage drop 1.5V
    General Type AC 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


    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.

    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 SSR wiring diagram 70-280VAC

    Tips: Solid state relay for heating industry

    At present, in the plastic machinery industry, solid state relays (SSRs) are usually used to control electric coils. Because the temperature control accuracy of the electric coil in the plastic machine is about ±1℃ and the control frequency of the electric coil is very high, the use of contactors can not usually achieve control effects. The use of SSR relay not only solves the problem of contactor’s contact bonding, but also improves accuracy of temperature control and overall performance of the plastic machine. Therefore, solid state relays (SSRs) are almost used to control heating coils by the entire plastic machinery industry by virtue of their own advantages.

    Existing reviews of Solid state relay, 3 phase, SSR-120AA, 120A 70-280V AC to AC
    Do we need a heat sink for solid state relay?
    We want to use your solid state relay to perform a compact reversing three phase circuit @ 480VAC. Do we need a heat sink, since we will only cycle once or twice per day. The on time will be for multiple hours.
    From: Joyce | Date: 23/06/2020
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Hi, Joyce. As long as the output current of the solid-state relay is larger than 10A, then it is recommended to use a heat sink for several hours of operation.
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