Compact Insulated Busbar Trunking (hereinafter referred to as Busbar Trunking) is available for AC three‑phase three‑wire, three‑phase four‑wire and three‑phase five‑wire systems, with a frequency of 50‑60 Hz, voltage up to 400 V and rated operating current ranging from 400 A to 6300 A. It serves mainly as a new‑type power supply and distribution equipment for industrial and mining enterprises, institutions and high‑rise buildings. For busbar trunking with sockets, power branch circuits can be conveniently led out via tap‑off boxes or plug‑in switch boxes. Busbar trunking features small size, compact structure, large current‑carrying capacity and easy maintenance. It can be installed directly from transformers to low‑voltage distribution cabinets, or from low‑voltage cabinets to distribution systems as main distribution lines.