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Solid State Relay Leak

Discussion in 'Electronic Basics' started by JV_Pili, Mar 2, 2005.

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  1. JV_Pili

    JV_Pili Guest


    I purchased a surplus Solid State Relay 10A 220 VAC
    to develop an AC Outlet controlled by the PC.

    I Design my hardware | circuit like an extension cord,
    I Plug my hardware and plug a Fluorecent Lamp.

    I was suprised that the flourecent light continuously blink
    I found out the the SSR(Solid State Relay) has a leakage

    My Question is... Is the Solid State Relay has a leak even
    if it is brand new?

    Please I need your advice so i buy a new solid state relay.
  2. Not surprising. The semiconductor switching
    device within the SSR is protected by a snubber
    circuit from switching transients. The snubber
    inherently allows a small AC current to flow
    when the SSR is in the nominally off state.
    Even if brand new and without any defect.
    The next one will do the same thing. Save your
    time and the vendor some grief.
  3. PeteS

    PeteS Guest

    Really depends on the SSR one uses. Vishay makes a range of devices
    (although I am not sure if they do 10A) that don't use a snubber but an
    internal current limiter, and therefore have superior off state
    performance (leakage typically < 1uA).

    Go to

    I have designed these in for low currents in sensitive applications
    (automatic bus terminators) so in the off state they can't interfere,
    and these devices perform quite well.


  4. Chris

    Chris Guest

    Try something like this (view in fixed font or M$ Notepad):

    ` Fluorescent
    ` Lamp
    ` .-------------. ____
    ` o-o o-o--|_--_|--o L1
    ` | '-------------' | Fuse
    ` | Nite Lite (6W) |
    ` | .-. |
    ` o------( X )------'
    ` | '-'
    ` .--------------. |
    ` | | |
    ` o + AC o--'
    ` | SSR |
    ` o - AC o-------------------------------o L2
    ` | |
    ` '--------------'
    created by Andy´s ASCII-Circuit v1.24.140803 Beta

    Leakage current through the SSR snubber is less than 1mA. The night
    light in parallel with the fluorescent lamp will keep the voltage
    across the lamp at less than a volt, which will certainly prevent it
    from turning on.

    Good luck
  5. Jamie

    Jamie Guest

    yes , most likely has a snubber on the AC terminals.
    just put some other load on the circuit, it will knock it
    down enough to kill that.
  6. JV_Pili

    JV_Pili Guest


    You Help me Alot
  7. peterken

    peterken Guest

    There MIGHT be one other reason for blinking fluorescent
    When the SSR is mounted in the N-line there's always phase connected
    IF any earthed plate runs next to the fluorescent (usually does) it still
    "glows" in the dark
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