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I have a breville muffin magic which stopped working. I traced it to the microtemp g4a00 and removed it. is that dangerous?

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That is a temperature sensitive thermo-fuse. It is set to cut off power if the device's temperature goes past the point the design engineers decided it would be dangerous at (typically a temperature followed by a "c" for celsius printed on the fuse). Without it, you usually won't get any power / heat. Short circuiting it with another wire could be dangerous. If the coil/thermo couple/heating element should go haywire (say, grossly overheat), there would be nothing to stop it from an assortment of bad things (fire, burns, melting insulation and plastic, etc). Very bad ju-ju. It typically indicates that some other part of the device has gone bad or shorted (heat element, etc). If you replace the fuse (a dollar at Fry's electronics) and it works, you're in business. If not, then your heating element or some other component is shorting or fried (often just as pricy as a spare part as for a whole new appliance). If it works, then it was just worn out or spiked or something, and you can keep on trucking. Realize that the fuses are sensitive. If you're soldering, use a proper electronics soldering iron with adjustable temp and a fine tip, proper solder, and use heat sinks to either side of the fuse (NTE replacement parts have the instructions inside & should explain this). An electronic store could help you, although if you have to invest $75+ for eqpt to fix it, perhaps you might just want to ask your local adult ed center, jr. college or high school electronics teacher for help soldering. Good project. If it simply uses crimped blade connectors, that's easy to buy & fix.

Posted on Dec 07, 2010

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