... achieve three reclosing, overload protection, three-stage over-current protection, automatic fault isolation section, improve system ... frequencyHz50/602Rated voltagekV12kV24kV3Rated insulation level1min power frequency withstand voltage dry wetDrykV4265Wet3450Rated lightning impulse withstand voltage75125Current data1Rated ... CO-180s-CO Permanent magnet outdoor high voltage vacuum circuit breaker