Thread: Power Supply Fuse

Some power supplies come with their own integrated fuse. The fuse is designed to protect the circuits in the power supply from damage should an over-current situation arise. You can read more about fuses on this PC Fundamentals page about basic electrical components. If there is a problem with the electrical system (surge, lightning strike) or internal fault within the power supply, the fuse will blow. It can then be replaced and if it did its job properly, the supply should operate normally. Unfortunately, many PC power supplies don't have fuses at all. This may be a cost-savings measure but it seems pretty short-sighted. Even many power supplies that do have fllses hide them from the user within the power supply case. It's not a good idea to open up the power supply unless you are sure you know what you are doing. It's a good idea though to search the back of your system to see if there is a user-replaceable power supply fuse.