... (transformers, switches, capacitors, filter resistance, transformer, generators, motors, power cables, etc. ) from over-voltage damage to electrical appliances, insulation ... MOA1: Low use;2: 3 KV ~ 220KV power distribution and power plant use;3: Transformer with neutral point; 4 ... voltage communication systems;2: 3 KV ~ 220KV AC power distribution and power plant system with;3: 3 KV ~ 35KV systems ...