mjrstar Posted March 15, 2022 Author Share Posted March 15, 2022 Do you really want me to answer that? It does have 2 fuses, one 5a in the supply as it enters the machine and one on the circuit board supply (3a maybe) to the transformer. But the one that was under the insulation for that transformer is now a blob of solder. Ran (pun intended) it for a week with the cover off and it didn't catch fire. I could pretty easily get hold of a fuse and solder it in I guess, but I wasn't really sure what spec to get and I lost interest because it goes again. 2 Quote Link to comment Share on other sites More sharing options...
cubastreet Posted April 21, 2022 Share Posted April 21, 2022 I'd put one of these in the transformer: https://www.jaycar.co.nz/132oc-thermal-fuse/p/ST3804 It's already overheated once and the fuse saved it. Next time the lacquer might melt then all the wires will join together. The line fuse will probably blow before it catches fire but the transformer will be rooted. 1 Quote Link to comment Share on other sites More sharing options...
datlow Posted April 21, 2022 Share Posted April 21, 2022 ^ that's rated to 133, for heating appliances I'd say the tranny etc would be pretty fubar by the time it gets that hot This is 77 https://www.jaycar.co.nz/77-c-thermal-fuse/p/ST3800 2 Quote Link to comment Share on other sites More sharing options...
datlow Posted April 21, 2022 Share Posted April 21, 2022 (b) The temperature rating of the cord. Cords are usually rated at 75°C or greater. Higher temperature cords of 85°C or greater rating are used for irons, heaters and toasters. Before replacing any cord, check the temperature rating that is marked on the sheath of the cord. 1 Quote Link to comment Share on other sites More sharing options...
cubastreet Posted April 22, 2022 Share Posted April 22, 2022 They don't use appliance cord in transformers, they use lacquer coated copper. Some industrial transformers are rated for 150C rise, so if ambient temp is 30, the windings run at 180 under full load. BTW when you solder in a new fuse you need a heatsink between the fuse and the end of the wire else the heat will kill it. 1 1 Quote Link to comment Share on other sites More sharing options...
mjrstar Posted April 22, 2022 Author Share Posted April 22, 2022 46 minutes ago, cubastreet said: BTW when you solder in a new fuse you need a heatsink between the fuse and the end of the wire else the heat will kill it. Ha that's a really good point! I totally would have ruined it with that prompt. Quote Link to comment Share on other sites More sharing options...
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