What is Bus Coupler

Bus coupler is a device used to couple the bus one with another without any power interruption and without creating dangerous arc.

Bus coupler may used in HT panel and MV panel and LT panel etc.

The bus coupler may be a ACB or VCB or MCCB or else MCB.The selection of breaker will completely based on the customer usage. 

Let us imagine, we have one 1000KVA transformer and one 500KVA transformer. 

The first one is providing the power supply to the Healthcare industry and the second one is providing the power supply to the data center.

And consider there are no redundancy of those the transformer. 

In this case, if any one transformer failed ,the load depends on that transformer does not have  any backup power supply which impact the operation of healthcare industry and data center.

But if we use the buscoupler between both our transformers ,we can shift the power supply one over to another and vice versa and there would not be a chance to the interruption of power supply at any situation.