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Kbz 250 1140 Coal Explosion Proof Vacuum Switch - China

price: contact company for price

Product Introduction

It is used in coal mines for three-phase isolated neutral power supply system with AC 50Hz, rated voltage 1140V(660V) and rated current to 250A, 350A, It can be used as master switch or sub-switch of power distribution system or used to control infrequency high-capacity starter.

The protection system, adopting advanced DSP microprocessors and high-capacity new chip for two-chip working, equipped with high-precision data processing and advanced protesting algorithms has high precision of protection and fast response. It can complete a number of protection functions such as overload, short circuit (including phase-sensitive protection and current amplitude protection), leakage atresia, leakage protection, selective leakage protection, under voltage, three-phase imbalance, phase breaking, temperature protection, gas protection, wind power atresia, power measurement etc. Besides, it is possible to customize to the manufactures the live side-load instructions, communication network, power-off atresia etc.

1. Liquid crystal display

2. Communications network functions

3. three-tier selective leakage protection

4. Electrical degrees measurement

5. Fault memory and query

6. Wind power and gas power atresia protection

7. functions opening and closing

8. Parameters fine- turning and correction

9. Testing functions for site analog

10. Clock display

11. Current, voltage, fault parameters, real-time display

12. Leakage atresia

13. Long-range short-circuit protection

14. Overload and short-circuit protection

Main Parameter



Rated voltage 1140(660)V

Rated current 200A, 400A

Rated frequency 50HZ

Working system long-term

Max. Breaking capacity 1140V, 7.5A

Operation mode electric closing or opening, manual opening


Company Contact:


  • Phone: 008618653763332

  • Address: No.69 Huoju Road, New & High Zone, Jining, China

  • Email: Email


Published date: October 8, 2013 -

  • Business Description: Shandong China Coal Industrial&Mining Supplies Group Co.,Ltd

    (hereinafter referred to as china coal) is a group company, which is a

    collection of e commerce, machinery manufacturing, software, research

    and development, modern logistics of large diversified industrial group.

    The group has 100 million yuan registered capital , with more than 1100

    employees.

    China coal is a professional manufacturing base of mines support equipment, transport equipment, lifting equipment, spray equipment, drilling equipment, ventilation equipment, lifting equipment and other products, as well as research and development new product and mine construction products with advanced high technology.

    In order to development of international trade , expansion overseas market, china coal established international trade branch company and import and export branch company. China coal actively expand foreign trade channels based on a good market image, brand, modern information platforms and capital protection. Based on the trading diversification strategy, the group established a chain loop trading system which is with import and export trade of the mining equipment as a core, the resources and market as the elements. China coal also formed a overseas sales team, that covers English, French, German, Portugal, Italy, Russian, Korean, Japanese, Arabic, and more than 10 language professionals to explore broader international markets on the Internet. At present, the group signed up for "china coal" trademark in the European Union, United States, Russia, United Kingdom, Taiwan, Macao, Singapore, Indonesia, Israel, and other countries, also get the right to use the trademark of the United Kingdom and Taiwan. Hundreds kinds of products such as tunnel boring machine, coal cutter machine etc. is exported more than 60 countries and regions which are the United States, Australia, Germany, Russia, Spain, France, Canada, United Kingdom, Italy, Portugal, Georgia, Austria, and Colombia. China coal is to establish long term, broader economic and trade cooperation and strategic partnership with a number of large state owned enterprises and customers, and won the unanimous approval of them.

    China coal has succeeded in passing a number of certification systems which are ISO9001, 2008 quality management system certification, United States ANAB management system certification, United Kingdom international authoritative certification bodies UKAS quality management system certification, SGS certification (made in China), Alibaba GIS certification. She has also obtained a variety of honor which are China excellent enterprise of mechanical industry, China equipment manufacturing operation top 10 enterprises, national reputation for quality assured supplier, China credit certification system demonstration unit, national quality trustworthy product for conformity assessment, national consumer satisfaction units, China AAA level quality trustworthy enterprise and Chinese e commerce company credit rating AAA level credit Enterprise.

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