Fuse markings us vs Brit

[Wiggles (Paul Wigton)]

This post should answer your question.

Fuse rating - exceeding manufacturer's specification

British vs American Fuses British did things just a little bit different than the Americans, including what the ratings marked on fuses mean. The British Standard rated fuses by the current that was guaranteed to make them blow instantly while the American (and now international) standard rates fuses by the current that they will carry forever. Fuses work on heat, so a small overload may take a long time to build up enough heat to melt the fusible element and blow the fuse. How warm the fuse wa…