Thermal Circuit Breaker Problem - can we fix it?

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  • dicky96
    Sun Seeker
    • Mar 2017
    • 1825
    • Spain

    #1

    Thermal Circuit Breaker Problem - can we fix it?

    Hi guys
    I have this ETA 3120-F321-P7T1-R14XB3 Circuit breaker from a Hill DX3000 Power Amplifier.

    The first problem I found with the amp was a faulty 25A Bridge rectifier FB2506 that was short circuit on one leg AC to negative

    I've replaced that but the amp has no power. That is because the ETA circuit breaker is open circuit on one pole. The other pole switches OK. The primary of the transformer seems OK (not short or open and doesn't look distressed) so I think that ETA circuit breaker is the only other problem I need to fix.


    Problem is finding a replacement. I can find some similar that have 3120-F321-P7T1-xxxxxx but the last digits are different.

    The similar ones I can find are silly expensive like 40 quid or more and mostly in the USA.

    What is inside these circuit breakers? I have had success in the past dismantling multipole switches and fixing them (usually heavily coroded contacts)

    If the circuit breaker is actually a double pole breaker and one pole is working, could i just short out the o/c side?

    Add an inline fuse for safety instead?

    Looking for a replacement, an equivalent part that isnt silly money, or how to dismantle and fix this one



    best regards
    Rich
    Attached Files
    Last edited by dicky96; 03-08-2019, 06:47 AM.
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  • R_J
    Badcaps Legend
    • Jun 2012
    • 9535
    • Canada

    #2
    Re: Thermal Circuit Breaker Problem - can we fix it?

    Here is the pdf for the E-T-A 3120 series
    They do have a "switch only" without the breaker that would fit, and you could add a seperate circuit breaker in ine
    Attached Files
    Last edited by R_J; 03-08-2019, 09:53 AM.

    Comment

    • sam_sam_sam
      Badcaps Legend
      • Jul 2011
      • 6039
      • USA

      #3
      Re: Thermal Circuit Breaker Problem - can we fix it?

      That part number might made for just that company that made that amp
      So you might not be able to get the exact part

      Comment

      • dicky96
        Sun Seeker
        • Mar 2017
        • 1825
        • Spain

        #4
        Re: Thermal Circuit Breaker Problem - can we fix it?

        Thanks for the advice

        One pole of the circuit breaker switches fine, so I think i will refit it and just another circuit breaker where the leads go to the faulty (open circuit) pole and it should work fine

        Something like this one https://www.ebay.co.uk/itm/Techna-T1...EAAOSwszZa5-hL I can get for less than £5



        Rich
        Last edited by dicky96; 03-08-2019, 12:37 PM.
        Follow me on YouTube
        ------------------
        Learn Electronics Repair
        https://www.youtube.com/channel/UCFX...R8UZ2vg/videos

        Comment

        • sam_sam_sam
          Badcaps Legend
          • Jul 2011
          • 6039
          • USA

          #5
          Re: Thermal Circuit Breaker Problem - can we fix it?

          Originally posted by dicky96
          Thanks for the advice

          One pole of the circuit breaker switches fine, so I think i will refit it and just another circuit breaker where the leads go to the faulty (open circuit) pole and it should work fine

          Something like this one https://www.ebay.co.uk/itm/Techna-T1...EAAOSwszZa5-hL I can get for less than £5

          Rich
          I would recommend replacing it with two separate breaker because I would not be surprised if the other half might be damaged in some way

          Comment

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