Electronics > Projects, Designs, and Technical Stuff

Polyfuse 8MILLI-ohms post-trip? am I missing something?

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SiliconWizard:

--- Quote from: T3sl4co1l on September 30, 2019, 02:48:24 pm ---Yeah, that's the other thing about polyfuses: the self-resetting is a convenience, not a guarantee.  They are good for ~hundreds of cycles and are supposed to fail (permanently) open.

--- End quote ---

Yeah. And remember they are not a silver bullet. Do your risk analysis. They make sense if an overcurrent situation can reasonably be expected to happen during the lifetime of your device, and if it's better to handle it this way (making the device usable again once the condition is gone), or if it makes more sense that the device stop functioning altogether, then requiring action from its users. In some cases, allowing it to be powered again could be unsafe.

pilotplater:
Thanks everyone for your detailed info, this is all very helpful. Good points all around!

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