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    Solid state relay, 3 phase, SSR-40DA, 40A 3-32V DC to AC

    SSR-40DA 40A Solid State Relay, 3 phase, voltage input 3-32V DC output 24-480V AC, high reliability, good performance, high switching speed and widely used in automatic control areas.
    SKU: ATO-TH4048ZD3

    Solid State Relay, 3 phase, load current 40A, DC-AC, zero-cross switch, built-in RC, optical isolation between input and out circuit, with LED indicator, especially suitable for frequent switching occasion and some harsh environments of corrosion, moisture, dust, etc.


    Basics Model ATO-TH4048ZD3
    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 DC-AC
    Load voltage 24~480V AC
    Load current 40A
    Control voltage 3~32V DC
    Control current 10-68mA
    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 Fan needed for cooling


    3 phase SSR dimensions

    Wiring diagram

    3-phase SSR wiring diagram 3-32VDC

    Tips: Thermal design and radiator selection of SSRs

    There is certain internal power dissipation in SSRs’ operation. The dissipation value is mainly determined by product of output voltage drop and load current, embodied in the form of heat radiation. The quality of heat dissipation directly affects maximum load current of SSRs and maximum allowable temperature of the working environment and it is one of the important factors that affect the reliable operation of SSRs. Therefore, we should pay attention to thermal design and radiator selection so that SSRs may work reliably and failure of and damages caused by poor heat dissipation to SSRs can be avoided.
    In general, SSRs, whose output current is less than 5A, use natural convection air enough to achieve the purpose of cooling, but when installed, SSRs need a good convection environment and the space between each SSR should not be less than the width of a SSR. It is essential for those SSRs with a load current greater than 10 A to use suitable radiators, even forced air cooling (air speed at 6 m/s) or water-cooling if necessary. The good heat dissipation condition is very important for SSRs’ reliable work.

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