Optional accessories for the NZM circuit breaker series offer a comprehensive portfolio of application possibilities for global use. The installation is flexible and straightforward thanks to modular functional units. Notes: The breakers can trip due to voltage impulses or continuous voltage application. If the working current release is live, touching the main contacts of the breaker during switching attempts is safely prevented. The working current release cannot be installed simultaneously with the leading auxiliary switch NZM-XHIV or the undervoltage release NZM-XU. Usable for: NZM1(-4), N(S)1(-4).