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

    Single phase Solid State Relay SSR-120AA, 120A, AC-AC, 70-280V AC input 24-480V AC output, brand new in perfect working condition, suitable for frequent switching occasion, high quality and high reliability.
    SKU: ATO-DH12048ZA2

    Solid State Relay, load current 120A, voltage input 70-280V AC output 24-480V AC, with LED indicator, zero-crossing switch, built-in RC, anti-corrosion, moisture-proof, anti-vibration and widely used in the area of automatic control.


    Basics Model ATO-DH12048ZA2
    Size 57.4х44.8х28mm
    Weight 135g
    Mounting method Bolted
    Ambient temperature -20℃~75℃
    Humidity ≤95%(non-condensing)
    Technical parameters Control mode AC-AC
    Load voltage 24~480V AC
    Load current 120A
    Control voltage 70~280V AC
    Control current AC ≤12mA
    On-state voltage drop ≤1.5V
    Off-state leakage current ≤2mA
    Off-state time ≤10ms
    Dielectric strength 2500V AC (1min)
    Insulation resistance 500МΩ with 500V DC
    LED indication YES
    Cooling Install fan for cooling.


    SSR single phase dimensions

    Wiring diagram

    SSR single phase wiring ac-ac

    Tips: Overvoltage protection for solid state relays

    Transient voltage disturbance is one of the main causes of damage to electronic circuits and equipment. In the process of using solid state relays, instantaneous voltage damage to the solid state relays often occurs.
    Common overvoltage protection methods include: RC snubber circuits, metal oxide varistors (MOVs), and built-in transient voltage suppressors (TVS).

    1. The RC snubber circuit absorbs and suppresses the momentary voltage applied to the solid state relay and reduces the rise rate of voltage index (dv/dt).
    2. MOVs are bipolar protection elements that absorb excessive transient voltages. However, with the energy absorption at each time, the performance of MOVs changes, the voltage level decreases and eventually the risk of overheating occurs due to unbearable supply voltage.
    3. TVS (Transient Voltage Suppressors) is efficient silicon PN junction protection device, a new product developed based on the voltage-regulator tube technology. Subjected to a transient high-energy impact at both ends of the TVS tube, it can turn the high impedance at both ends into a low impedance at very high speeds (response time is typically less than a few nS) while absorbing a large current, clamping the voltage between the two poles to a safe value, thus ensuring that the circuit components behind are protected from the impact of transient high energy.
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