Thermal Fuse in Fan

Nov 04, 2009 6 Replies
T

Hi, I have a ceiling fan that stopped fanning. Turns out to be a thermal fuse that's blown, probably due to running the fan all day. The fan works fine otherwise. The fuse is a white rectangular radial type marked 115deg M20 07F. I have on stock a number of axial ones marked 156deg 10A. The closest Altronics stocks is 133deg axial 10A.



My question is: Would it cause a fire risk to use the 157deg ones, or even the 133deg? Or has the fan manufacturer just been over cautious by choosing such a low value? Or could it have other reasons, it certainly boosts their turnover. After all it failed in an otherwise healthy fan.



Tony


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P

"TonyS"

** WES Components sell the right one:

Cat no: TF115

Costs less than $2.

** Yes. Very much so.
** No - the wire insulation is probably rated at 125 C max.

** Any fan motor running at 115 C is NOT healthy.

.... Phil

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T

Thanks Phil, will order the right one then. I guess there is another point I should mention: The mounting was in a way that the airflow was a fair bit reduced. I thought that may have contributed to the overheating and opened it up with a roof vent.

Cheers

Tony

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N

What might seem a silly comment - I don't know what construction the fuse is (lugs incorporated?) It should probably be installed using crimp connections. Years ago I heard of someone who installed a couple of thermal fuses by soldering before realiszing what they were doing...............

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T

It was actually soldered. The wires are 50mm long. When soldering them hurry up and use pliers as a heat sink :-)

Tony

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B

[...]

Too true. If your fan motor is running at over 60c, you need to find out why, & fix it.

W . | ,. w , "Some people are alive only because \\|/ \\|/ it is illegal to kill them." Perna condita delenda est ---^----^---------------------------------------------------------------
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B

LOL. Good point.

W . | ,. w , "Some people are alive only because \\|/ \\|/ it is illegal to kill them." Perna condita delenda est ---^----^---------------------------------------------------------------
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