checking fuses

Discussion in 'General Electronics Chat' started by lotusmoon, Aug 12, 2014.

  1. lotusmoon

    Thread Starter Member

    Jun 14, 2013
    203
    4
    I just wanted to check if my thinking was correct on this.
    I have a victron inverter in which I have recently manage to blow something. it does AC to DC and DC to AC. I bought a new DC fuse but this made no difference.
    With the AC fuse I just decided to test it - and put it in a 12 volt DC circuit with an LED, the LED turn on. Am I right in thinking that this fuse is not blown or is there something else I should be taking into consideration - as I have not put it in a AC circuit.?
     
  2. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    All you need is a simply continuity check to determine if a fuse is blown or not..
    ac or dc won't matter..
    If it turned on its fine.
     
  3. shteii01

    AAC Fanatic!

    Feb 19, 2010
    3,388
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    LED is On, the fuse is not blown.
     
  4. bwilliams60

    Active Member

    Nov 18, 2012
    722
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    Not always true. I have seen fuses which passed continuity test and opened up after turn on and then passed continuity test again. Only way to check is run some current through it. Maybe 80% of rated amperage
     
  5. lotusmoon

    Thread Starter Member

    Jun 14, 2013
    203
    4
    Thank you for this info. I had used DC as it was safe and I had only done DC electrical type things before. but I found a way doctoring an AC plug and put it in there it happily turned on a light but I did not try it on anything stronger. The fuse is twenty AMPS should I try it on an electrical heater 3kw?
     
  6. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,770
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    The fuse is fine..
     
    lotusmoon likes this.
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