Can I interchange a 30 amp fuse with a 20 amp fuse?

Md Ariful Islam

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Dr. Md Rushad Rahman

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You should always use the correct fuse size, however if you're in a bind you can use a 20 amp fuse to replace a 30 amp fuse. NEVER use a 30 amp fuse to replace a 20 amp fuse, as this may overheat the wiring and cause a fire. A 20 amp fuse used to replace a 30 amp fuse may blow due to loading, so a reduction in load is required by not running everything on that circuit at the same time. Replace the 20 amp fuse with the proper 30 amp fuse for that circuit as soon as possible, as this will allow you to return to normal loading on that circuit.

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