PTC (positive temperature coefficient )thermistor switches at one particular temperature. Making use of the characteristics that the resistance of PTC thermistor increases sharply above curie temperature, when ambient temperature increases abnormally, protective circuit installed PTC thermistor will turn on or cut off loop through resistance changing, achieving thermal protection purpose. PTC thermistor protect such equipment and components as motors, transformers, power transistors and thyristors against over-temperature. A PTC thermistor is less expensive than a thermostat, and its switch temperature can be more accurately specified. It is also smaller and easier to design-in to electronic circuitry. Therefore PTC thermistor can be ideal devices for temperature detection, monitoring, indicating, limiting and over (excessive) temperature protection.

Features of PTC Thermistor for Temperature Protection and temperature limiting sensors

2 Outlook construction: A-radial leaded epoxy resin coated form, B-metal tag lug form,.
PTC Thermistor Protection temperature: 60~130C
Quick response.
Long stability.
Small dimension, convenient for installation.
Do not need to be reset after protection.