need help..fuse not tripping

Discussion in 'The Projects Forum' started by appoos, Sep 18, 2006.

  1. appoos

    Thread Starter Member

    Sep 18, 2006
    12
    0
    hey frenz..
    in my project i m using 4A MCB(miniature circuit breaker).
    I am puting that in serial with my 20A DC power supply.
    and i m drawing 15A current also(some times).
    But the fuse is not tripping.
    plz help me to troubleshoot.
    i tried with 3 MCBs.same thing happened
    Wat will b the problem?
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Circuit breakers take a bit of time to respond - the gizmo inside has to get hot enough to generate movement first.

    You might try adding a current limiter or a fast-blow fuse.
     
  3. appoos

    Thread Starter Member

    Sep 18, 2006
    12
    0
    we need to test with MCB only...
    if it takes time to trip,how MCBs at our house s working?
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Let's try again.

    How long is the 15A pulse that fails to trip the 4A breaker? How many milliseconds?
     
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