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Resettable fuses - PolySwitch devices. A resettable fuse or polymeric positive temperature coefficient device (PPTC) is a passive electronic component used to protect against overcurrent faults in electronic circuits. The device is also known as a multifuse or polyfuse or polyswitch.
Polymeric positive temperature coefficient (PPTC) device or resettable fuse; PTC heating element, a type of self-regulating heater; PTC thermistor, a type of resistor; Positive train control, a type of train protection system
The voltage drop should be taken into account, particularly when using a fuse in low-voltage applications. Voltage drop often is not significant in more traditional wire type fuses, but can be significant in other technologies such as resettable (PPTC) type fuses.
Portfolio includes NTC (negative temperature coefficient) and PTC (positive temperature coefficient) thermistors, temperature sensor probes, varistors, ESD (electrostatic discharge) suppressors, and polymer resettable fuses (also known as PPTC).
When first connected to a voltage source, a large current corresponding to the low, cold, resistance flows, but as the thermistor self-heats, the current is reduced until a limiting current (and corresponding peak device temperature) is reached. The current-limiting effect can replace fuses.
An assortment of thermal fuses. A thermal cutoff is an electrical safety device (either a thermal fuse or thermal switch) that interrupts electric current when heated to a specific temperature. These devices may be for one-time use (a thermal fuse), or may be reset manually or automatically (a thermal switch).
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