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Sask | Without looking, I would say Wall is on the right track. My guess is that the style with the bump on one end is a rejection feature so only the fuse with the correct interrupting rating will fit.
The simple way to understand a fuse is its amp rating. Say 10 amp. But the second and third details are it's volt rating and its interrupting rating (IR). The bump will be in regards to interrupting rating. So that say, a 10,000 amp (10 kA) fuse can't be switched for a 18 kA fuse.
I think you will see a kA and IR value somewhere on the fuse label.
Interrupting rating comes into play when you have your meter on amps but then go touch two 600v terminals without reconnecting leads for volt measurement. The short circuit can be sustained if the IR rating of fuse is not high enough, the fuse blows but does not interrupt the short circuit.
All breakers have IR ratings also and is important for understanding what breakers can be substituted. | |
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Fluke Multimeter fuse designation
