What Could Cause a Fuse to Blow?

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A fuse blow out can be caused by a device that has shorted or malfunctioned, or it can be caused by drawing more currant than the fuse will allow. Make sure all fuses are the appropriate voltage to avoid blow outs with instructions from an experienced carpenter and construction specialist in this free video on home repair.

Part of the Video Series: Home Repair Tips
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Video Transcript

Hello, my name is Mark Blocker, in this segment we're going to cover what could cause a fuse to blow. OK, what could cause a fuse to blow? Here I've got a fuse removed from an electrical item and it's in it's socket holder so we can see what the fuse is. This particular fuse, each fuse has a different rating as to how much current it will allow before it blows. This one is a one amp rating. Generally speaking what could cause a fuse to blow is something in it's device has shorted or malfunctioned and is exceeding the rating of this fuse, it's drawing more current than the fuse will allow and that causes a fuse to blow. Sometimes fuses over time and age just wear out and get old and they'll burn out through natural causes. In that case you can simply replace the fuse and retest it. And if it pops the fuse again, you know that you've got a malfunctioning device and something inside this unit has malfunctioned or shorted or worn out and caused the fuse to blow. So in most cases what causes a fuse to blow is a malfunction in an electronic device or electronic utensil or power tool or whatever the case may be that's exceeded the current rating of that fuse. Usually a malfunction. It could also be caused by lightning or something exceeding a high voltage or voltage spike induced by lightening or something of that nature. Generally a malfunction is what causes a fuse to blow.

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