The selective main circuit breakers of the S750DR series are certified as voltage-independent selective main circuit breakers (SHU) according to DIN0641-21, 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 locking 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 also be secured with a padlock, wire seal or cable tie. The switching state can be monitored via an attachable auxiliary switch.
| Property | Value |
| Number of poles: | 3 |
| Rated current: | 20 A |
| Rated voltage: | 400 V |
| Tripping characteristic: | E |
| Protection class (IP): | IP40 |
| Size (according to DIN 43880): | 6 |
| Mounting type: | DIN rail |
| Rated insulation voltage Ui: | 690 V |
| Frequency: | 50 Hz |
| Pollution degree: | 3 |
| Rated breaking capacity: | 25 kA |
| Rated impulse withstand voltage: | 6 kV |
| Overvoltage category: | 4 |
| Switching neutral conductor: | no |
