Optional accessories for the NZM circuit breaker series offer an extensive portfolio of application options for worldwide use. Installation is flexible and easy thanks to modular function groups. Labeling: NA-main switch-open in 0 position-German/English. Can be used for: NZM1(-4), PN1(-4), N(S)1(-4), NZM2(-4), PN2(-4), N(S)2(-4)§NZM3(-4), PN3(-4), N(S)3(-4)§NZM4(-4), N(S)4(-4)