PTC Thermistor Over-current Protector
Current Protection PTC Thermistor Description
Ceramic PTC (positive temperature coefficient) thermistors are used instead of conventional fuses to protect load, such as motors, transformers, or electronic circuit, against overcurrent for circuit protection. PTC thermistor protector not only respond to inadmissibly high currents but also if a preset temperature limit is exceeded. PTC thermistor over-current protector limits the power dissipation of the whole circuit by increasing their resistance and thus reducing the current to a harmless residual value. In contrast to conventional fuses, PTC thermistor resettable fuses do not have to be replaced after elimination of the fault but resume their protective function immediately after a short cooling-down time.
PTC Thermistor Over-current Protector Application
It applies in the over-current overload and short circuit protection of transformers, battery charger, switches, switch power supply, adaptor, meter, instrumentation, apparatus, electronic coils, control panels, air conditioner, automotive electron, etc.
Operating Principle of PTC Thermistor for Overload Over-current Protection
The operating principle is as indicated in the following. When a circuit is in the normal status, the current through PTC is lower than the rated current and PTC thermistor protector is in the normal state with small resistance value, which will not affect the normal operation of the protected circuit. In case of some fault in the circuit and the current is greater than the rated current, the PTC thermistor protector will become hot quickly and present a high resistance state, which sets the circuit relatively "off" to protect the circuit from damage. After the fault is removed, PTC thermistor protector will automatically restore its low resistance state and the circuit will resume normal operation.
Normally, when PTC thermistor is used as an overcurrent protection component, it is preferred to select maximum operating current, maximum operating voltage and proper specifications. Furthermore such factors should be taken into consideration as the dimensions of the components, rated zero-power resistance, operating temperature range, etc.
Send product request
Other supplier products
 |
Flared stainless steel tube thermistor temperature sensor | Flared stainless steel tube thermistor temperature sensor probe, "bullet" style temperature probe for air, gas or liquid. Typical application coffe... |
 |
Pointed tip stainless steel NTC thermistor temperature sensor | Stainless Steel Housing Immersion Penetration Probe. Pointed tip stainless steel NTC thermistor temperature sensor features Long stainless ste... |
 |
PTC Thermistor for Telecom Over-current Protection | Telecom PTC Thermistor Description This series of ceramic PTC (positive temperature coefficient ) thermistors help provide protection against pow... |
 |
Axial Leaded Glass Encapsulated NTC Thermistor | Axial Leaded Glass Encapsulated diode package NTC Thermistor applied in temperature sensing, measurement, monitoring, control, temperature range -4... |
 |
Metal Housing Threaded Fitting NTC thermistor temperature probes | Metal Housing Threaded Fitting NTC thermistor temperature probes consists of a thermistor mounted inside a threaded pipe plug. The temperature pro... |
Same products
 |
Maxi Blade Fuse | Seller: Dongguan Tianrui Electronics Co., Ltd | Maxi Blade Fuse,Blade Fuse |
 |
ASTA UK PLUG BSI Fuse 3 pins XR-318A | Seller: Guangdong XiongRun Electrical Co., Ltd | Product: 3 Píns U.K. plug Standard: BS1363 Rated Current: 3A/5A/10A/13A Rated Voltage:250V... |
 |
DC Fuse Link | Seller: YUEQING FEEO ELECTRIC CO.,LTD awy | Yueqing Feeo Electric Co.,Ltd is one of the professional China dc fuse link manufacturers a... |
 |
DC Fuse Holder | Seller: YUEQING FEEO ELECTRIC CO.,LTD | Yueqing Feeo Electric Co.,Ltd is one of the professional China dc fuse holder manufacturers... |
 |
DC Fuse Link | Seller: YUEQING FEEO ELECTRIC CO.,LTD | Yueqing Feeo Electric Co.,Ltd is one of the professional China dc fuse link manufacturers a... |
