Ammeter Selector Switch

The Ammeter Selector Switch - as the name suggests - is connected to an Ammeter, the purpose being monitoring of current in all the three phases (and, if needed, also in the neutral) using only one ammeter. The Selector switch provided for ammeter is to check the amount of current taken from each phase supply ; ie,R,Y,B. Each phase supply should be covered with a Current Transformer (CT) with the rated Amps capacities. The two lead of each phase CT are connected to the respective leads in the selector switch of the ammeter.