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What are Self-Resetting PPTC Fuses?

Model: (Various brands) Various
Part: Fuse box

Video tutorial

PPTC fuses (Polymeric Positive Temperature Coefficient) are electronic protection devices that reset themselves after a fault, unlike traditional fuses, which burn out and need replacing. Under normal conditions, their resistance is low, and current flows freely through the circuit.

In case of overcurrent, the heat generated by the excess current causes the polymer around the PPTC to expand; the resistance increases dramatically, interrupting the current flow. This protects the circuit from damage.

Once the cause of the fault is removed, the PPTC cools down, the polymer contracts, and the resistance returns to low, restoring the circuit without replacements. There are significant advantages over traditional fuses: no maintenance; they are very compact; gradual intervention based on the severity of the fault.

They are used in portable devices, but also in automotive applications, protecting sensitive motors or circuits. They have limitations, as they are not instantaneous: they depend on the excess current, and after intervention, they need time to cool down and reset.


Posted on 2 April 2026 by ScegliAuto


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How to Remove the Rear Seat of a Hyundai Tucson?

To remove the rear seat of a Hyundai Tucson, follow these steps. Start by moving the front seats to their most forward position to gain space. Next, locate the release lever on the underside of the rear seat, near the floor. Press this lever down while pulling the seat upwards to unlock it from the anchor pins. Once unlocked, tilt the seat upwards and forwards to remove it from its position. Repeat this process for both sides of the rear seat. Be careful of any electrical cables or components that may be connected to the seat during removal. Once the rear seat is removed, the disassembly is complete.

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by ScegliAuto

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