A 3-phase busbar system consists of three (or four) parallel conductors carrying the three phases (L1, L2, L3) of a three-phase AC system, plus a neutral conductor (N) in 4-wire systems. The conductors are typically flat copper or aluminum bars, insulated from each. Three-phase busbars are the backbone of industrial and commercial power distribution. They carry three-phase AC power from transformers and switchgear to distribution panels, motor control centers, and large loads. Understanding 3-phase busbar design is essential for electrical engineers and. The HOLDONE Compact ProBus Series is a cutting-edge Compact Type Busbar Trunking System, meticulously engineered to align with GB7251 and IEC60439 standards. Designed to operate efficiently at a working voltage of 1000V, it caters to a broad range of rated currents from 400A to 6300A. 4 conductors 63A Ambient temperature. LBplus DATA is an evolution of the LBplus busbar trunking system.