The selective main circuit breakers of the S750 series are certified as voltage-independent selective main circuit breakers (SHU) according to DIN VDE 0641-21, can be operated by laymen and are designed for the highest overvoltage category. They can be used in a wide range of applications: as a disconnecting device at the meter panel in accordance with the network operator's TAB or VDE-AR-N 4101, as well as in all low-voltage main distributions to protect distribution circuits and as a disconnecting device with a disconnecting function. The special selectivity properties to ensure high system availability are particularly noteworthy. The S750 series is designed for direct installation on a 4- or 5-pole busbar system 40mm (12mm x 5/10mm). Regardless of the rated current of the S750, the busbar system can be fed directly with up to 50mm² and max. 100A via the lower terminal. Devices in the S 750 family include an integrated locking option that enables the three poles of a three-phase supply to be blocked simultaneously. The integrated locking slide locks in the ON or OFF position and can be additionally secured with a padlock, wire seal or cable tie.