MZ21 PTC Thermistor 400~600 OHMS 220VAC 160C 8x2.5mm Stone Element for Over Heating Protection

Description

PTCR (Positive Temperature Coefficient of Resistance) is the 1 kind of thermistor with strong positive temperature characteristics, mainly composed of BaTiO3,BaTiO3 ceramic is the 1 kind of typical ferroelectric material, room temperature resistivity is greater than 10 12 Ω cm, for insulator, after semi-conductive doping shows a strong PTC effect-room temperature resistivity is very low, with the increase of temperature, in the vicinity of the Curie point mutation, resulting in several orders of magnitude of change. This is because there is a barrier layer caused by surface states at the grain boundary of polycrystalline BaTiO3 semiconductor material. At Curie temperature, the grain boundary has ferroelectricity, the dielectric constant is very large, the barrier height is low, electrons can easily pass through the barrier, and the corresponding material resistivity is small. However, above Curie temperature, the crystal boundary layer has lattice transformation, ferroelectricity disappears, the dielectric constant increases sharply, and electrons are difficult to cross the barrier, the resistivity of the corresponding material rises sharply, which is shown as the PTC effect of the material macroscopically.

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Dongguan Ampfort Electronics Co., Ltd. is a high-tech enterprise specializing in R&D, manufacturing and sales, committed to becoming a comprehensive supplier of circuit protection components.

We introduced advanced quality system,management systems and high-precision automation equipment from Germany, set up multiple production bases and continue to increase product lines. Our team consist of experienced engineers, passionate business elites, and regularly trained skilled workers, which provides a solid foundation for quality assurance and productivity performance. Moreover, our products have passed safety certifications of many countries and are favored by many consumers by years’ unremitting efforts.

We cooperated with universities and colleges, and will continue to research and develop new products , committed to high-quality circuit protection solutions, and provide global customers with efficient technology, products, and testing support to meet their requirements for rapid development of new products. We are gradually updating from "Made In China" to "Created In China" and to "Intelligent Manufacturing In China", from circuit design to product testing, we will provide you with one-stop service in the field of circuit protection.After years of intensive cultivation, we have maintained a good relationship with our peers and have become distributor of many famous electronic component brands to meet the diverse needs of customers.

The main products include: Thermistors, Varistors, Temperature Sensors, Fuses and corresponding Hardware and Plastic accessories, Inductors, Thermal Protector, Overload/Composite Protectors, Discharge Tubes, Photoresistors and Wiring Harnesses etc. Through the combination of different process devices,Ampfort Electronics can meet customers' individual circuit protection requirements. Our products are widely used in: power adapters, switching power supplies, chargers, transformers, computers, telephones, household appliances, communication products, lighting products, toy products, various instruments and various electronic cables, electrical products, IT, Consumer electronics, automobiles, batteries and other fields.

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