PTC thermistors (Positive Temperature Coefficient) are temperature-dependent resistors whose resistance increases as the temperature rises, due to their positive temperature coefficient. This characteristic distinguishes them from NTC thermistors, whose resistance decreases with increasing temperature. PTC thermistors are typically manufactured from ceramic semiconductor materials that produce a sharp increase in resistance at a specific temperature threshold. They are used to protect electrical circuits against overcurrent, as a high current causes the device to heat up, rapidly increasing the resistance and thereby limiting the current. They are also used in temperature monitoring, self-regulating heating elements, and applications such as motor and transformer protection.
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