I'd like to thank Chris for sending this fuse. It was one of three used with a 6 ton resin potted 33kV transformer.
Sorry for the overzealous audio levels at the start. I didn't realise the forehead mic was going to pick my voice up so well.
The fuses have spring loaded pins so that if one fails either by overcurrent or thermally, it fires out a spring loaded pin that then trips an isolator. I'm not 100% sure where the auxiliary wire that allows the spring to release is connected to, since most of it had been obliterated in normal operation. I wonder if part of the triggering is done by pressure build up in the fuse when it blows.
A link to one of Rodalco's videos showing a trip mechanism:-
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