The selective main circuit breakers of the S750DR 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. They are designed for installation on a 35 mm top-hat rail in accordance with DIN EN 60715. Devices in the S 750DR family include an integrated blocking option that enables the 3 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. The switching state can be monitored via an attachable auxiliary switch.