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How to use resettable fuses?

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  • How to use resettable fuses?

    Hello everyone
    i wanted to know how to use resettable fuses in a PCB?
    Do I just connect them in series with the supply or are there additional components needed?
    And is a fuse enough for short circuit protection, or is it better to use something like an E-Fuse ic?
    Thank you

  • #2
    All depends. A PTC is slow, has a maximum voltage and a (high) resistance.
    I have used a resettable fuse more for long term overload and not so much short circuit protection (going external).
    E-fuse are components that can fail too.
    Most fail safe are the non-resettable fuses.

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    • #3
      So non resettable fuses are fast enough to protect against shorts?

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      • #4
        So it is the speed?
        That also depends on the load profile. If you have soft-start or not.
        The fastest is electronic. Both resettable and non resettable fuse are driven by temperature. So it needs to heat up first.
        The (glass) fuses are - simply speaking - in fast and time lag variants. The fast can open in 10ms.
        https://www.littelfuse.com/media?res...-448-datasheet

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        • #5
          Thank you very much

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          • #6
            Often, the regulators itself have a protection for shorts - means if there is a short, the voltage will not even come up (or only for a very short period of time). We often use fuses for overload protection (e.g. something drives higher currents than it should - but it is not necessary a short circuit).

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            • #7
              Thank you very much, Mr Robert

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