Disclosed is a system for installing withdrawable units (11) into switchgears. Said withdrawable units (11) are installed on certain levels (12, 14, 16, 18) of switchgear cabinets (10), communicate via a fieldbus, and are unambiguously identified via a unit address while basic data required for operating the unit is contained in a memory of the withdrawable unit. Each switchgear cabinet (10) is provided with at least one Ethernet switch (20) with which at least the withdrawable units communicate. An application server (30) managing at least the TCP/IP address allocation as well as a database (40) in which at least the unit data of at least the withdrawable units (11) is at least stored and/or managed are also part of the system. Further disclosed is a method for installing withdrawable units (11) into switchgears, said withdrawable units (11) being installed on certain levels (12, 13, 16, 18) of a switchgear cabinet (10), communicating via a fieldbus, being unambiguously identifiable via a unit address, and containing, in a memory, basic data required for operating the unit. Communication via the fieldbus is based on Ethernet TCP/IP technology, the unit addresses of the withdrawable units (11) are automatically assigned thereto and managed by an application server (30) which is integrated into the Ethernet network, and at least the basic data for each withdrawable unit (11) is automatically downloaded from a database (40) into the withdrawable unit (11).