1. This switchgear is case metal-enclosed structure. In accordance with the national standard GB3906 and

international standardIEC298, protection degree IP2X. The metal-enclosed structure effectively prevents

short-circuit failure by intruders .

2. When air insulation distance between polar to polar or polar to ground ≤125mm, porcelain support insulators

(≥8000N) is applied. All these ensure higher insulation intensity and stability.

3. Breakers, both upper and lower insulation switches, grounding switches and interlock mechanisms between

doors all takes force mechanical lock mode to meet the requirement of "five- prevention"