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The air-insulated bus duct has a large air gap between the conductors, allowing for natural convection and rapid heat dissipation.

The larger phase-to-phase distance effectively reduces the probability of phase-to-phase short circuits due to insulation aging or localized damage. Even in humid environments, its electrical safety remains reliable as long as the creepage distance is sufficient.

The air-insulated bus duct has a relatively simple connector structure, is less sensitive to installation precision than compact types, and has stronger error correction capabilities during on-site construction.

The manufacturing process is simple. In factory projects with lower current ratings (e.g., 400A-1000A) and less stringent space requirements, using air-type bus ducts can significantly reduce initial investment costs.

The conductors have a certain amount of internal movement allowance. When faced with thermal expansion and contraction during long-distance transmission, or slight ground settlement and aftershocks, the internal structure can absorb some of the mechanical stress, making it less prone to shell deformation.

In high-voltage or special electrical environments, air insulation effectively suppresses corona discharge. This is why many busbars in the medium-voltage field still retain air isolation designs.