Selection of a circuit breaker depends essentially on :

•Type of system - determines the type of product and the number of poles connected in series for each polarity

•Rated voltage - determines the number of series poles taking part in current interruption.

•Nominal current - determines the rated current of the circuit breaker.

•Maximum short-circuit current at the point of installation - determines the breaking capacity.(based on L/R time constant)

Released for:Schneider Electric South Africa