BBT or Bus Bar Trunking system is a replacement to traditional cable and panel distribution. MCB, MCCB in BBT is plugin component as bus is extended to consumer area.
Busbar Trunking System is a not that new technology, in 1930 it was first introduced in USA. Comparing with the conventional wire or cable BBT is far better. In some modern construction, people are now preferring BBT other than cable.
What is Busbar Trunking System:
We know about bus bar. Three phase incomer from generator or a source at first comes to a three phase bus bar by cable or wire, then circuit breaker or other device connection is made with cable from bus bar , circuit breaker / protection device and bus bar stays in the panel board.
But with Busbar Trunking System, there is no cable or wire at all. There is no panel. Bus bar is extended through the use area. A circuit breaker / protection device can just plug in the Busbar Trunking and connect load from the circuit breaker.