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Is the Polymer-Resettable-Fuse device self-resetting? How? How fast?

Yes, the device is self-resetting once the fault is cleared and the device has an opportunity to cool down. The cooling causes the device to contract and reconnects the carbon black molecules, thus lowering the resistance. The normal way to cool down the device is to power off the equipment that is being protected by the Polymer-Resettable-Fuse device, cutting the maintain or trickle current and allowing the device to cool. This should not be confused with a bi-metallic device which will also self-reset. A typical bi-metallic device will reset even if the fault is not removed, thus causing a cycling on and off between the fault event and a protected state which may damage the equipment. The Polymer-Resettable-Fuse device will latch at the high resistance state until the fault is removed. By combining the Polymer-Resettable-Fuse device in parallel with another PTC device such as a light bulb it is possible to design a circuit using a Polymer-Resettable-Fuse device that will reset without powering off the device. (See the speaker application note for an example.) The time it takes a device to reset to the low resistance state depends on a variety of factors: Which device it is How it is mounted or fixtured Ambient temperature Nature and duration of the trip event In general most devices under expected conditions will reset within a couple of minutes although many will reset within seconds.

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