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A PTC (Positive Temperature Coefficient) sensor is an electronic component that uses temperature variation to regulate the electrical current flowing through a circuit. These probes are often used to protect electronic circuits against overvoltage and overcurrent.
The PTC probe is made of a conductive material, such as carbon polymer or ceramic, which has an electrical resistance that increases with increasing temperature. Thus, as the temperature increases, the resistance of the PTC probe also increases, automatically reducing the current flowing through the probe. This protects the electronic components from damage caused by overcurrents.