... voltage of 10kV, rated frequency of 50Hz and rated current of 630A. Besides, its also suitable for direct ... clock and so on;4. The high-voltage vacuum circuit breaker with spring mechanism is adopted forbreaking principle components;5. ... It can provide protection in such cases as overload, short circuit, electricityleakage, insulation monitoring, overvoltage, undervoltage, three-phase imbalanceetc ...