PTC Thermistor for Overload & Over-Current Protection (AMZ1)
Product Specifications
| Prod Model: |
AMZ1 |
| Markets: |
North America,South America,Eastern Europe,Southeast Asia,Africa,Oceania,Mid East,Eastern Asia,Western Europe |
| Resistance: |
Sensitive Resistor |
| Type: |
Thermal Resistor |
| Installation: |
DIP Resistor |
| Function For Resistance: |
Protective Resistor |
| Material: |
Ceramic and Metal |
| Package Type: |
Throught Hole |
Product Description
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.
R25 resistance: 0.5-5000 ohm
Maximum operating voltage(vmax): 12-650 V
Non-trip current(int): 5-700mA
Diameter: 3-22mm
AMWEI Thermistor Co., Ltd., professional manufacturer of PTC & NTC thermistors (THERMally sensitive resistors) and thermistor temperature sensors probe. PTC (Positive Temperature Coefficient) thermistor for over-current & overload protection, telecom, lighting switching, temperature sensing & protection, self-regulation heating, motor starting. NTC (Negative Temperature Coefficient) thermistor application covers power thermistor for inrush current suppressing limiting, NTC thermistor for temperature measurement, indicator, temperature compensation, temperature control, in either radial leaded, axial leaded or surface mount configuration. Can also make custom thermistors assemblies and temperature probes, housed in either stainless steel, copper, plastic, teflon, aluminum, epoxy and heat shrinkable tubing, such as air/gas temperature sensors, surface temperature sensors and immersion temperature sensors, etc.
The 2 founders of AMWEI came from Nonmetal Material Research Institute of Huazhong University of Science and Technology, once as a visiting scholar in Japan in late 1980, and took charge of Chinese first imported PTC production line. Thorough successive hard work of a group of specialists in ceramic sensitive material, welding technology, packaging technology, we own core know-how in powder formula and key production technics. Our NTC thermistor features with high accuracy, fast response and long time stability. PTC thermistor switch life and voltage withstanding capacity is leading in China.
AMWEI PTC R&D now aims at low resistivity and miniaturization.
We maintain the highest quality standards through continuous employee training, rigorous internal auditing. We take continuous improvement as a primary business objective. SPC, MSA, 6-Sigma techniques are being applied throughout the manufacturing process in an endless loop of quality improvement. ISO9001: 2000 certified in 2003.
AMWEI PTC and NTC thermistor has been widely applied in the field of telecom & network, HVAC & R, home electric appliance, white goods, food service, consumer electronics, lighting, office automation equipment, medical, automotive, consumer electronics, meter & instrumentation, data logger, power supply and transformer, industrial process control etc.
HVAC applications include indoor/outdoor air temperature, duct air temperature & water temperature. Thermistor sensors play a vital part in the efficiency of white goods by measuring and controlling the temperature of water, steam, air, food, as well as the electronic circuitry. Thermistors can be found all around the home in washing machines, dishwashers, cookers, microwave ovens, irons, toasters, refrigerators and deep freezers. Electronic sensors offer improved accuracy over electro-mechanical solutions and can be designed to perform over a wide range of temperatures and specifications.
Food service applications include food safety, and commercial cooking equipment. Automotive applications include climate control, fuel level/temperature, coolant & engine temperature, and combustion controls. AMWEI has a professional engineer team for customer product design and application assistance. Customer satisfaction is our honor and effort target, fast response is our pledge.
Annual production capacity: 90 million pieces, Production area: 3700 square meters.
Applying AMWEI thermistor products, you can get high quality product, fast delivery. Contact us to get the thermistor sensor appropriate to your product.
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