4.7 uF capacity , self-healing, with VDE certification. Therefore, this unit has a higher efficiency than even four units of the X21.
The line filter reduces voltage peaks from the public power supply polluting the home power network ("dirty power"), it enhances the EMC-characteristics of demand switches and boosts their switching stability.
It is an additional measure for enhancement of the overall network quality within the circuit shielded by the demand switch. It is independent of the brand or product type an the switching state of the demand switch.