Now every major type vacuum circuit breaker manufacturers have their own models, and giving it the same name as just a code to take it. ZN beginning of the model is the national standard naming rule breaker Hengshui high-voltage vacuum circuit breakers, now generally no one uses, are made in accordance with their own product-specific. Z represents high voltage vacuum circuit breaker vacuum, N denotes indoors, the other numbers and characters no specific meaning. ZN is the beginning of a vacuum households ... beginning ZW is vacuum outdoors ..... V is generally English Vacuum acronym other characters generally have no special significance. -12 Shows such models rated at 12kV. Little relationship between product performance and product models, mainly to see the manufacturer's technical water products. Modern home lighting circuits shall electricity, power outlet circuits, air-conditioning circuit, separate wiring, when one of the circuit (such as outlet circuit) fails, the other circuit can still supply is normal. Outlet circuit leakage protection device should be installed to prevent leakage caused by household appliances, personal electric shock. 1, total household distribution box switch generally choose bipolar 32-63A miniature circuit breakers or disconnectors. 2, the lighting circuit breakers generally small 10-16A. 3, the outlet circuit generally choose 16-20A leakage protection circuit breaker. 4, air conditioning, mini circuit breaker generally choose 16-25A. 5, using a bipolar or 1P + N (phase + neutral) Cangzhou voltage vacuum circuit breaker breaker, when the line short-circuit failure or leakage, immediately cut off the power supply line and the neutral line, to ensure personal safety and use Langfang voltage vacuum circuit breaker safety equipment _ Huayi Electric Power (certified) _ high-voltage vacuum circuit breaker provided by the Xi'an Huayi power plant. Xian Huayi power plant (www.xahy.com) is a leader in Xi'an, high voltage circuit breakers, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Huayi power in leadership with the staff warmly welcome all inquiries negotiations to create electricity Huayi a better future.