What should always be checked when using plug fuses of the Edison-base type?

When using plug fuses of the Edison-base type, it is crucial to check the amperage rating. The amperage rating indicates the maximum current that the fuse can safely carry before it blows, protecting the circuit from excessive current that could cause overheating or damage to the electrical system. Using a fuse with the appropriate amperage rating ensures that the protective mechanism will function correctly, interrupting the flow of electricity in case of a short circuit or overload.

If the amperage rating is too high, the fuse may not blow when it should, leading to potential hazards, while a rating that is too low may result in unnecessary blown fuses during normal operation. Therefore, verifying the amperage rating is essential for safe and effective use of Edison-base plug fuses. This focus on compatibility with the circuit's requirements is why the amperage rating takes precedence in this context.