1. Eliminate short-circuit faults caused by small animals such as mice and snakes;
2. Prevent the corrosion of acid, alkali, salt and other chemical substances on the busbar;
3. Prevent maintenance personnel from accidentally entering the charging gap and causing accidental injury;
4. Adapt to the development trend of miniaturization of switchgear cabinets;
5. Solve the problem of phase insulation between the busbar slots.