Polymer PTC thermistors can be used in computers and their external devices, mobile phones, battery packs, remote communication and network equipment, transformers, industrial control equipment, automobiles and other electronic products, to play the role of over-current or over-temperature protection.

What are the main differences between polymer PTC thermistors and fuses, bimetal circuit breakers and ceramic PTC thermistors?

The polymer PTC thermistor is a conductive polymer material with positive temperature coefficient. The most significant difference between it and the fuse is that the former can be used repeatedly. Both products can provide overcurrent protection, but the same polymer PTC thermistor can provide this protection multiple times, and the fuse must be replaced with another one after providing overcurrent protection.

The main difference between the polymer PTC thermistor and the bimetallic circuit breaker is that the former will not be reset in the off state until the accident is not ruled out, but the bimetallic circuit breaker can reset itself when the accident still exists. This may cause electromagnetic waves and sparks during reset. At the same time, reconnecting the circuit while the circuit is in a fault condition may damage the device and thus be unsafe. The polymer PTC thermistor can maintain the high resistance state until the fault is eliminated.

The difference between the polymer PTC thermistor and the ceramic PTC thermistor lies in the difference between the initial resistance of the element, the action time (reaction time to the accident event) and the size. Compared with ceramic PTC thermistors, polymer PTC thermistors with the same maintenance current have a smaller size, lower resistance, and faster response.