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PTC electric heaterIt has the property that its resistance increases significantly when a certain temperature is exceeded. This property makes it suitable for use as a temperature protection device to detect defined high temperatures to protect circuits from overheating.

Advantages of PTC electric heater:

PTC thermistors are temperature-dependent resistors based on special semiconductor ceramics with a high positive temperature coefficient (PTC). They exhibit relatively low resistance values ​​at room temperature, but when they are heated by an external heat source above a certain temperature (Curie temperature), their resistance rises significantly.

With this unique property, PTC electric heaters can be used to protect components and equipment from overheating. The PTC limit temperature sensor portfolio includes SMD, lead disk and threaded types, so that the right component can be used for almost every overheat detection requirement. Motor protection sensors are PTC limit temperature sensors with a specially designed shape that can be assembled directly into the motor winding (stator side).

The following are applications of PTC limit temperature sensors and motor protection sensors.

Application of PTC extreme temperature sensor

Application: Overtemperature protection of transistor circuits

Application: Overtemperature protection of power semiconductor devices

Application: Overtemperature protection of single-phase/three-phase induction motors

Application: Overtemperature protection of transistor circuits

PTC electric heaters can be used as a simple and convenient way to protect transistor circuits from increased ambient temperature or heat generated by the transistor itself.

The PTC thermistor used in the circuit detects the increase in ambient temperature and enters a high-ohmic state. As a result, the base-emitter voltage of the transistor drops and the transistor cuts off the load current. When the ambient temperature returns to normal levels, the PTC thermistor returns to its original low-resistance state.

Application: Overtemperature protection of power semiconductor devices

The PTC thermistor is thermally bonded to a heat sink (heat sink). When a certain temperature is exceeded, the resistance of the PTC electric heater increases significantly and the base voltage of the power transistor decreases. As a result, the collector current decreases and heat generation is suppressed, thereby preventing the power transistor from overheating.

Application: Overtemperature protection of single-phase/three-phase induction motors

Single-phase and three-phase induction motors used in many electronic devices, including industrial equipment, contain overcurrent and overtemperature protection devices. In particular,PTC electric heaterUsed as a motor protection sensor to prevent the motor from overheating. Highly reliable protection can be achieved. When the PTC thermistor heats to a certain temperature, the trip unit (automatic circuit breaker) is activated to shut down the power supply.