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You said fuse, so I am assuming it is an old main panel and that there are perhaps 2 or 3 fuses in the panel. First off you have to be very careful not to get electrocuted working with a main fuse. Here are some assumptions to check not knowing your configuration.

If you have some power, but not all and multiple circuits have no power, you may have blown a fuse on one leg of the power from the Power Company.

If you have no power and there isn't a power outage in your area you may have blown fuse.

Best way to check is with a volt meter. You can pick one up cheaply from local hardware store. Suggest one with a meter rather than a go/no go meter with a light or buzzer.

The black lead of the meter to ground and the red lead to each side of the fuse if you don't know which is in and which is out. There should be 120 V or there abouts on both sides of the fuse to ground.

When replacing the fuse there should be a disconnect switch so neither end of the fuse holder is live during a fuse change.

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Q: How can you tell if main 125 amp fuse is bad?
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