The MS1xxx power infeed modules have a wide range of properties and options. Primarily, they offer the possibility to connect the 3-phase system voltage to the system. For this purpose, a lockable terminal compartment with a corresponding cable gland is available in accordance with the specifications in the standard for the mains connection. The module also contains fuses and a 4-pin main switch. This can be locked in position 0. Additional functions of the modules can be 24 V DC power supply units and energy measurement. In a simple variant, the mains voltage or also the 24 V DC can be made available to the MX-System via ECP/ENP connectors on the front side.