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Desk fan broken due to melted component

I have a desk fan, it broke, when i opened it i saw a component put in between the live wire and a switch mechanism, i have connected the two wires that was connected to the device and it works fine, i am just concerned about the effects that this change will have later on.
A description of the component follows: It is round steel cylinder with a coper strip on the outside, on the copper strip lays two copper connectors that is pressed to the cylinder which is connected to the wires that goes to live and the switching mechanism in turn.

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I believe what youre describing is a thermal fuse.

Normal fuses (like the one in the plug) protect against too much current being drawn by a faulty device, which is the most common type of fault.
Thermal fuses protect against the temperature within an enclosure going above a certain level, which can occour even though the current being drawn by the device is within the rating of the normal fuse.

Thermal fuses are an additional level of protection for the user of a device that has a tendancy to overheat without drawing enough current to blow the normal fuse. They also provide protection to the device itself where overheating may be caused by a condition outside it's normal operating envelope such as something has jammed the fan blades. Most fans use shaded pole motors, a type of motor that when stalled (jammed) doesnt draw excessive curent but does overheat.

It's your call as to whether you continue to use it without repalcing the thermal fuse, but so long as you dont leave it unattended, I doubt it will be a problem.

Posted on Nov 15, 2009

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