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    Solid state relay, 3 phase, SSR-40AA, 40A 70-280V AC to AC

    SSR-40AA 40A Solid State Relay, 3 phase, voltage input 70-280V AC output 24-480V AC, excellent quality and brand new, especially suitable for the occasion of frequent switching and the harsh environment like corrosion, moisture, dust, etc.
    SKU: ATO-TH4048ZA2
    Delivery date: 6-12 days

    Solid State Relay, 3 phase, load current 40A, AC-AC, with LED indicator, zero-crossing switch, built-in RC, optical isolation, no electric spark, no noise, no contact, high switching speed, high reliability, long lifespan, wide applications.


    Basics Model ATO-TH4048ZA2
    Size 105(L)х74(W)х33(H)mm
    Weight 500g
    Mounting method Bolted
    Ambient temperature -20℃~75℃
    Humidity ≤95%(non-condensing)
    Technical parameters Control mode AC-AC
    Load voltage 24~480V AC
    Load current 40A
    Control voltage 70~280V AC
    Control current ≤12mA
    On-state voltage drop ≤1.5V AC
    Off-state leakage current ≤10mA
    Off-state time ≤10ms
    Dielectric strength 2500V AC (1min)
    Insulation resistance 500МΩ with 500V DC
    LED indication YES
    Cooling Need fan for cooling or water cooling


    3 phase SSR dimensions

    Wiring diagram

    3 phase SSR wiring diagram 70-280VAC

    Tips: SSRs’ over-current protection

    SSRs take semiconductor switching devices as power output components, and are sensitive to temperature changes. Over-current may overheat semiconductor chips, which results in there decreased quality, life expectancy reduction or even permanent damage. Although SSRs in an instant can withstand surge current 10 times larger than the rated current, but permanent damages are likely to be caused if the current is more than such a value. Therefore, over-current protection is very important. There are many ways for over-current protection. The key is to fast response. For AC SSR with SCR as output devices, general protection circuits are invalid due to current zero required by SCR’s turn-off if the surge current and short-circuit current are larger than SSR’s surge current within 10 Ms (50Hz). At this moment, fast acting fuses exclusive for semiconductor devices. Fuses’ nominal fusing current should not exceed the nominal current value of the SSR. There are a variety of commercial fuses, but their quality is different. Therefore, pay attention when choosing fuses.

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