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For example, it stops a person from putting a 20-amp fuse in a 15-amp circuit, a potentially serious mistake.

Rejection bases are also known as "tamper-proof," and they were developed to prevent homeowners from using the wrong type of fuse for a circuit. Each Type S fuse of a specific amperage rating has a matching base adapter with a specific size of thread that prevents mismatching the fuses. The Type S fuse then screws into the adapter. Rejection base (Type S) fuses will work with Edison-type sockets only when combined with an adapter base that screws and locks into the Edison socket.

The Edison base (Type T) looks like a light bulb base and fits the standard sockets found in old fuse boxes. There are two different types of bases and screw-in fuses: the Edison base (found on Type T fuses) and the rejection base (found on Type S fuses).

The Spruce Home Improvement Review Boardįuses for standard circuits (not high-voltage appliance circuits) are called plug fuses and have screw-in bases.