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 in fixed installation or withdrawable design, as a circuit breaker or load breaker. The integrable protection and tripping device MicroLogic can be equipped with a wide range of functions and accessories. Air circuit breaker MasterPact NWb 4000A H1 Icu is 100kA at 440VAC Icu is 50kA 3P basic switch without Micrologic Fixed installation The Masterpact can be ordered via the online configurator.