Abstract: An arrangement includes a switch including a plurality of connectable modules. A first module is a connection module, electrical connections running into an interior, starting from the connection module for connection purposes. A second module is a manual plug module, connectable via its second contacts to the connection module, electrical connections passing external to the switch starting from the manual plug module for connection purposes. A third module is a communication module including a communication electronics system and including second contacts and first contacts, the communication module being connectable via its second contacts to the connection module and the manual plug module being connectable via its second contacts to the communication module. Second contacts of the communication module are electrically connectable to first contacts of the communication module or to the communication electronics system.

Abstract: An arrangement includes a switch including a plurality of connectable modules. A first module is a connection module, electrical connections running into an interior, starting from the connection module for connection purposes. A second module is a manual plug module, connectable via its second contacts to the connection module, electrical connections passing external to the switch starting from the manual plug module for connection purposes. A third module is a communication module including a communication electronics system and including second contacts and first contacts, the communication module being connectable via its second contacts to the connection module and the manual plug module being connectable via its second contacts to the communication module. Second contacts of the communication module are electrically connectable to first contacts of the communication module or to the communication electronics system.

Abstract: An arrangement includes a switch, including main contacts for connection, the switch being insertable into a mounting rack as far as a final position in which the main contacts make contact with power connections arranged on the mounting rack. Auxiliary contacts, arranged on the mounting rack and on the switch, are designed to correspond to one another and make electrical contact with one another when the switch is inserted. In an embodiment, the auxiliary contacts on the rack are contact pins, and the auxiliary contacts on the switch are sockets, or vice versa, the contact pins being moved into the sockets beyond a movement distance from the final position during insertion of the switch and remaining in electrical contact until the final position of the switch, and the main contacts making contact with the power connections once after the final position has been reached.