电压保护水平 Up在1 kA(8/20) Up在5 kA(8/20) Up在In时 | ≤300 V ≤350 V ≤400 V | ≤500 V ≤650 V ≤700 V | ≤900 V ≤1.1 kV ≤1.4 kV | ≤1.0 kV ≤1.3 kV ≤1.6 kV | ≤1.2 kV ≤1.5kV ≤1.8 kV | ≤1.5 kV ≤1.8kV ≤2.2 kV | ≤1.7 kV ≤2.1 kV ≤2.5 kV |