Surefire01
Electrical
Was just wondering if anybody knew what the first three letters stand for: NIT20M25, TIA32M40, TIS63M80 or has it been lost in the midst of time?
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HRC fuse name meanings
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These were the GEC type designations for the their 'Red Spot' range of fuselinks. The first letter was a 'family' name for fuses with a similar purpose, the second and third letters I'm not at all sure about, if they ever had anything other than an arbitrary meaning as a code letter.
This catalogue from Lawson has a fairly comprehensive cross-reference for fuses manufactured by GEC, Brush, Dorman and one or two others in the back.
This catalogue from Lawson has a fairly comprehensive cross-reference for fuses manufactured by GEC, Brush, Dorman and one or two others in the back.
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Surefire01
Electrical
Thanks for that Scotty. This came up in a conversation with a colleague. I kind of suspected that the letters might be just a manufacturers reference but wasn't sure.
Well the T series are general-purpose 415V AC / 250V DC fuselinks, the SS series are similar but 660 or 690V rated (?), the J series are fuses with modified blade arrangements for use by the utility companies, and after that I'd be guessing! 
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