SMT & PCB Equipment Parts

SMT Equipment Parts & Supplies

AMWEI Thermistor PTC Thermistor Current Protect listed by Amwei Thermistor Sensor. Add your item for sale/wanted

AMWEI Thermistor PTC Thermistor Current Protect

AMWEI Thermistor PTC Thermistor Current Protect

AMWEI Thermistor PTC Thermistor Current Protect


AMWEI Thermistor PTC Thermistor Current Protect



Model Year:






Offered by:

Amwei Thermistor Sensor

Company Information:

Amwei Thermistor Sensor

Professional manufacturer of PTC & NTC thermistor, temperature sensor pressure Sensors. Thermistors for overload over-current protect, inrush current limit, temperature sense measurement compensation control, protect.

Shenzhen, China

Manufacturer of Components

  • Phone 86-755-26570111
  • Fax 86-755-26571122

Amwei Thermistor Sensor website

Company Postings:

(9) SMT parts, accessories & PCB supplies items

(43) products in the catalog

AMWEI Thermistor PTC Thermistor Current Protect Specs:

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.

This AMWEI Thermistor PTC Thermistor Current Protect has been viewed 309 times.

The contact for this AMWEI Thermistor PTC Thermistor Current Protect has been emailed 0 times.

Reflow Oven

SMT spare parts, feeders, nozzles