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1. Adopt the high-quality vacuum arc-extinguishing chamber and the optimized magnetic field control technology to efficiently interrupt the fault current without arcing at the instant of zero current (Within 20 ms). 2. The vacuum medium features an extremely high insulating strength, enables the opening daylight of vacuum circuit breaker to withstand an extremely high recovery voltage and thereby prevents re-striking. 3. The fully sealed vacuum arc-extinguishing chamber maintains a high vacuum level inside, and thus eradicates oxidation and aging issues. Its mechanical life span can reach up to 20,000 times.