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: For early connection of the undervoltage release in main switch applications as well as for interlocking and load shedding circuits. Can be used for E-STOP devices in conjunction with E-STOP push-buttons. If the shunt release is energized, contact with the main switch contacts is reliably prevented when attempting to switch on. Advance of the auxiliary contacts when switching on and off (manual operation): approximately 20 ms. Undervoltage release cannot be installed simultaneously with leading auxiliary switch NZM..-XHIV.. or shunt release NZM..-XA.... Cannot be used in conjunction with NZM..-XR.. remote actuator. Can be used for: NZM2(-4), N(S)2(-4), NZM3(-4), N(S)3(-4).