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Ptc Thermistor Current Protector

Posted at: Offers to Sell and Export | Posted on: Wed 24 Feb, 2010 9:38 am | Product Category: Thermistor [63]
 
ptc thermistor current protector
Products Photos CatalogPtc Thermistor Current Photos Catalog



PTC thermistors current protector, also called PTC thermistor resettable fuses, protect load against



over-current, overload, short circuit. No need for replacement, resume protective function after a short cooling-down time.

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.



Company Contact:

AMWEI photo
Contact Name: Rosa
Company Name: Amwei Thermistor
Email: Email
Tel: 86-755-26570111
Fax: 86-755-26571122
Street Address: 11-502, Songpingshan,
Langshan Road, North Area, Shenzhen
High-tech Industrial Park, Nanshan,
Shenzhen, Guangdong 518057 China
Website: http://www.amwei.com
Member name: AMWEI
Country: China-CN China
Member Since: 24 February 2010
Total Leads: 36 AMWEI Import Export Business Leads
Business focus: Thermistors, Ptc Thermistor, Ntc Thermistor, Thermistor Temperature Sensor Probe, Linear Silicon Ptc Thermsitor, Inrush Current Limiter Power Ntc
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Product Category: Thermistor [63]
 
 
 

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