Inside a Multimeter Fuse

Ever wonder what’s inside those expensive multimeter fuses?  This is a Bussmann DMM-B-11A fuse used in many popular late-model DMMs for the 10A current range.  The arc-quenching sand filler and glass fiber-reinforced melamine tube gives it a high rupture capacity (HRC).  It is rated at 1000V (AC or DC) and is capable of interrupting 20,000 amps.

I find it interesting that the zig-zag shaped element has separated into several pieces, no doubt by design.  Fortunately it did its job and the multimeter and forgetful multimeter user it protected suffered no damage.

About modemhead

Fixologist and multimeter junkie.
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3 Responses to Inside a Multimeter Fuse

  1. 73's de Edd says:

    How about silica jell verus “sand” ?

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