Slow blow fuse markings

[StephenP]

I need to replace a fuse in a light fitting toroid transformer (we know why it blew!) however I'm unsure of one part of the reference number on it.

It's a glass fuse marked '5KT1AL250V', which I understand to be a slow acting (T), 1 amp (1A) low breaking capacity (L) 250V based on a bit of research. The bit I can't find info on is the '5K' at the start.

Does anyone know what the '5K' means or can I just ignore and go for something just marked 'T1AL250V'?

The current one is glass - does the replacement need to be too?

Having fun trying to find an exact match .... how about this one?

https://uk.farnell.com/littelfuse/0239001-mxp/cart...

Edited by StephenP on Friday 29th August 18:03

[Inbox]

StephenP said:

I need to replace a fuse in a light fitting toroid transformer (we know why it blew!) however I'm unsure of one part of the reference number on it.

It's a glass fuse marked '5KT1AL250V', which I understand to be a slow acting (T), 1 amp (1A) low breaking capacity (L) 250V based on a bit of research. The bit I can't find info on is the '5K' at the start.

Does anyone know what the '5K' means or can I just ignore and go for something just marked 'T1AL250V'?

The current one is glass - does the replacement need to be too?

Having fun trying to find an exact match .... how about this one?

https://uk.farnell.com/littelfuse/0239001-mxp/cart...

Edited by StephenP on Friday 29th August 18:03

I would hazard a guess the 5K is a manufacturer specific identifier, if the manufacturer of the fuse is known some further googling might help (could be just a marking on the end cap).

As for a replacement you should use one of the same size, rating and construction i.e. the replacement meets everything after the 5K code inc. being glass.

[JoshSm]

Anything the right size marked T1AL250V should do the trick, it always seems to boil down to a glass fuse available from many sources.

[StephenP]

Great, thanks for the replies. I have no excuse now to procrastinate and not fix the light in my wife's dressing room!