Optional accessories for the NZM circuit breaker series offer an extensive portfolio of application options for worldwide use. Installation is flexible and simple thanks to modular function groups. Notes: The switches are triggered when a voltage pulse is applied or when continuous voltage is applied. If the shunt release is live, touching the main switch contacts is safely prevented when attempting to switch it on. The shunt release cannot be installed at the same time as the leading auxiliary switch NZM..-XHIV.. or the undervoltage release NZM..-XU.. Can be used for: NZM4(-4), N(S)4(-4)