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ppppenguin · 15th Jan 2008, 1:45 pm

And transistors are there to protect the fuses

I once saw a cascade of blown fuses ranging from a 3A one in the plug to a 30A MCB protecting the subcircuit. I find it difficult to believe that the energy let through by the lowest rated fuse (usually quoted as I*I*t) was enough to trip or blow the bigger ones but that's what happened.

The original fault was a mains filter cap that exploded in a colleague's face. Fortunately he was unhurt. This all happened at BBC Kingswood Warren way back in 1974.

15th Jan 2008, 1:45 pm	#21
ppppenguin Retired Dormant Member Join Date: Dec 2003 Location: North London, UK. Posts: 6,168	Re: Fuses And transistors are there to protect the fuses I once saw a cascade of blown fuses ranging from a 3A one in the plug to a 30A MCB protecting the subcircuit. I find it difficult to believe that the energy let through by the lowest rated fuse (usually quoted as IIt) was enough to trip or blow the bigger ones but that's what happened. The original fault was a mains filter cap that exploded in a colleague's face. Fortunately he was unhurt. This all happened at BBC Kingswood Warren way back in 1974.