MasterPact NT and NW is the proven generation of air circuit breakers up to 6300 A, which incorporate the latest technologies. The MasterPact NT and NW consists of 3 sizes, NT from 630 to 1600A, NW from 800 to 4000A and NWb from 4000 to 6300A. It can be configured as a fixed installation or withdrawable device, or as a circuit breaker or load disconnector. The integrable protection and tripping device MicroLogic can be equipped with a wide range of functions and accessories. Air circuit breaker MasterPact NW 4000A H1 Icu is 66kA at 440V 4-pole basic switch fixed installation without Micrologic The Masterpact can be ordered via the online configurator.