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Series connection reduces the voltage across the terminals of each pole (the total voltage is divided by two, three or four depending on the circuit breaker) and the operation of all poles provides the breaking capacity of the overall device.
This makes it possible to break short-circuit currents at high voltages while optimizing solutions (e.g. a Compact NSX 100 kA 250 V per pole can be used on a 750 V system with three poles connected in series, thus reducing the cost compared to a 750 V solution.
b- The Compact NSX range enables parallel connection of the poles, thereby optimizing the use of the rated currents
you will find attached the wiring schemes for both connections (series and parallel)