DZD-10391/D5AR 200~400 Ω Smart Thermistor For overvoltage and overcurrent protection

NTC power thermistor is a device for suppressing inrush current to an electric circuit. while its resistance remains negligible low during continuous operation. Power NTC thermistor limits surge current by functioning as a power resistor which drops from a high cold resistance to a low hot resistance when heated by the current flowing through it. Thanks to their low resistance in the operating state, Power thermistor have a considerably lower power dissipation than the fixed resistors frequently used for this application.

Features

• Strong capability of surge current protection

• Big material constant (B value), small remain resistance

• Resin coated disk thermistor with uninsulated lead-wires
• Wide range of resistance, current and dimension

Applications

• Electronic meter transformer overvoltage and overcurrent protection

The varistor in the intelligent resistor for transformer overvoltage and overcurrent protection plays the role of restraining the voltage, and the thermistor plays the role of limiting the current. The current terminal responds quickly due to the high grid voltage or the wrong input voltage. The varistor keeps the primary voltage of the transformer at about 220V. Due to the thermal coupling effect and the self-heating effect of the thermistor, the resistance value increases significantly. The circuit is disconnected before the varistor burns and bursts to avoid accidents. After the fault, the intelligent resistor reduces the overvoltage to the normal working voltage of the electric meter, and ensures that the electric meter can work and measure normally. After protection, the meter works and measures normally.

COMPANY OVERVIEW

Xian Xiwuer Electronic & Info. Co., Ltd. is located in Beiguan, Xi'an city cover in an area of 4000 ㎡, with employees of 2300, and about 580 technicians, amongthem, there are 135 engineers, 21 senior engineers. The company has total assets of 315 million RMB Yuan, fixed assets of 137 million RMB Yuan, which is a large enterprise mainly engaged in producing electronic components.The company has the largest production scale of Varistor,SPD( Surge Protective Device)and HV Ceramic Capacitor in China, with the following main products :

1. Varistors & SPD

4. Thermistor

The main production line and inspection equipment & instrument are imported from Japan, America, Belgium and Switzerland etc. The annual production capacity of the two leading products has been reached to 5 million pcs and 150 million pcs respectively, with the market holding rate in China of about 10% and 30% respectively by continually technical innovation. Varistors and SPD produced by the company enjoyed great reputation in the international market, being exported to many countries and areas such as Japan,USA, Hong Kong etc., with the customers like India and GE in USA. are already sold to LG company in Korea with large quantity, and also to Spainand India etc.

Not only the products quality and technical capacity, but also the completeness of the models are all in the leading place in China. The main products have got CCEE, UL, VDE & TUV approval. The quality system was set up according to the requirement of ISO9000 since 1992, and has passed ISO9002 approval by DNV International Organization in July 1994, then got ISO9001 certification by British organization in 2000, by then we are both the first one who are approved by ISO9000 certification in the North-west area of China and the same occupation. We passed all the successive periodical audit and smoothly get the new certificate registered in Holland in Aug.1997; the quality system is strengthened and completed constantly. And we also got ISO18000 certificate.We believe we are able to supply satisfied goods and service to customers home and abroad with the most reasonable price and the shortest delivery time, on basis of our excellent quality assurance capacity, technical development capacity and rich manufacturing experiences.

CERTIFICATE