Features:
1. Prohibit short circuit fault caused by small animals such as mouse, snake, etc.
2. Prevent corrosion of chemical substances to the bus, such as acid alkali and salt, etc.
3. Prevent dew flashover and dirt flashover.
4. Prevent overhaul personnel from entering the power gap so that an accident or inquiry may occur.
5. Adapt to the small-scale development trend of the switch cabinet.
6. Solve the interphase insulation problem of the bus trough.