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    Solid state relay SSR-100AA, 100A 70-280V AC to AC

    5 out of 5 based on 3 reviews | Write a review
    SSR-100AA single phase solid state relay 100 amp, AC to AC, control voltage 70-280V AC, load voltage 24-480V AC, zero cross switching type, panel mount, high reliability and favorable price.
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    Delivery date: 6-12 days


    100A solid state relay (SSR) with 70-280V AC input 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-DH100AA
    Input Control voltage range 70-280V AC
    Max. input current 15mA
    Must operate voltage 70V AC
    Must release voltage 50V AC
    Output Load voltage range 24-480V AC
    Peak voltage 800V AC
    Maximum load current 100A
    Maximum off-state leakage current 2mA
    Maximum off-state time 10mS
    Maximum on-state voltage drop 1.5V
    General Type AC to AC, single phase
    Dimension L – W – H (mm) 57.4х44.8х28
    Weight 135g
    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.

    Dimension (Unit: mm)

    Single Phase SSR Dimensions

    Wiring Diagram

    Single Phase AC to AC SSR Wiring Diagram

    Tips: What is a solid state relay?

    A solid state relay is a non-contact switch composed of microelectronic circuits, discrete electronic devices, and electronic power devices. It is a non-contact switching device with the characteristics of relays, in which semiconductor devices are used to replace traditional electrical contacts as switching devices. Single-phase SSR is a four-terminal active device, two of which are input terminals and the others are output terminals. Optical isolation lies between them. Once the input terminal is given DC or pulse signals to a certain current value, the output terminal can be changed from off-state to on-state. It has the function of not only amplifying driving effect, but also isolation and is suitable for driving high-power switch-type actuators. Compared with the electromagnetic relay, it has higher reliability, no contact, long life, fast speed and small disturbance to the outside world and has been widely used.

    Solid state relay (SSR) is simple but widely used in the automation fields. Thus, it is not complex to wire a solid state relay. In this vedio, ATO takes a 40 Amp SSR (DC - AC) for example to show the wiring of a SSR and then switch on/off a motor with this SSR.

    Existing reviews of Solid state relay SSR-100AA, 100A 70-280V AC to AC
    State relay 100A very fast to be hot
    On 10/1/23 order94548 I purchased SSR 60A relay. I use it with 10A load. It works great. It barely gets warm.
    On 14/2/23 order 945923 I purchased SSR 100A relay. I use it with the same 10A load. It gets very fast very hot. This is unacceptable. I believe the relay is faulty. Please let me know how we can solve this problem. Thanks.
    From: heard | Date: 06/04/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    You need a heat sink, and the load must be equipped with a heat sink if it exceeds 5A.
    Please refer to the link:
    State relay is very fast to be hot
    Thank you for the replay. I have heat sink. The two test were in the same environment with the same load 10A. The 60A becomes light warm. This is how it suppose to be.
    The 100A becomes over 80℃ in a minute.
    I have a lot of other cheap SSR and they behave like yours 100A.
    Very fast to get hot. Measured with thermometer. Please I want to return the faulty one.
    From: ajax | Date: 06/04/2023
    Was this review helpful? Yes No (0/0)
    ATO Responded
    Is your SSR coated with thermal grease? SSR must be coated with thermal grease.
    Because solid state relays will have an on-state voltage drop, the SSR will become hot when it is running. How much the SSR heats up depends on the size of the load and the working time.
    In addition to the heat sink, we recommend that you also add a fan for cooling.
    For other precautions, please refer to the figure below.
    For booster fan
    I'm using this solid state relay for an HVAC booster fan. I used an AC circuit off my carrier furnace meant for an air purifier to trigger the relay. I will order more.
    From: Enon | Date: 09/12/2022
    Was this review helpful? Yes No (0/0)
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