What does a ptc relay do?

A PTC (Positive Temperature Coefficient) relay is an electronic component that uses a positive temperature coefficient thermistor to control electrical circuits. As the temperature increases, the resistance of the PTC device rises sharply, which can interrupt the flow of current and protect circuits from overcurrent conditions. When the temperature drops, the resistance decreases, allowing current to flow again. This makes PTC relays useful for applications requiring thermal protection and resettable fuses.