How to troubleshoot and replace a thermal fuse

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Has your electric heater or other appliance gone cold? Check out this helpful video and see how to get it heating up again. The thermal fuse, or cut-off, is a protective device that may be the problem.


trickybilly says:

I am very new to electronics (only as a hobby, not my profession). Questions:
1) why is one end of the fuse shorter then another?
2) is it important how you connect it – "which way" should the "sharper" end face?
3) I would like to blow it that I connect some 9V battery to an LED via a resistor with having this fuse in the circuit. Using a lighter I would heat it up above 94*C. Any precautions maybe? I would probably use alligator clips for connecting the fuse to the linear circuit or maybe just some copper wire because I fear the clips will also overheat and maybe melt their rubber part.
Fuse type: SEFUSE, sf90r0, 94*C, 15A

Winston Clarke says:

Good video, ? does this type of thermal fuse have to solder in any particular direction,

watcher818 says:

Hello David, great video. However with all due respect, the soldering job is not quite 100% proper. Solder is not the main component in adhering 2 wires together, so it is not just the ac of putting some solder on both, then 'sticking together. Sore it may hold up but the connection could be better. The best connections is to mechanically put the wires together, first. Either a twist, or a bent hook and crimp on both wires first. That joint alone is pretty strong in itself, but not fully reliable. Applying the solder fills the minute spaces between your joint's wires for a solid connection. Any of the old timers will say that the mechanical connection first, then filling in gaps left, is the way to have a joint stronger than the wire itself. Please don't take this in the wrong way, I just wanted to pass this on to you, or others that see the video.
There is a crimped fastener that sometimes comes with the thermal fuse. This is ideal to get a strong hold on the wires, Some will still leave this crimped connection bare, others will then solder it. Thank your the nice video sir.

David Potts says:

Where did you get a replacement ?

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