KBZ-250/1140 Coal explosion-proof vacuum switch

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KBZ-250/1140 Coal explosion-proof vacuum switch 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

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Shandong China Coal Industry & Mining Group

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