Arrangement comprising a switch for switching powers in the low-voltage range, comprising modules (3, 4, 5) which are able to be plugged one onto the other, wherein first contacts of one module (3 or 4) each make contact with second contacts of the module (4 or 5) which is plugged on first said module, wherein a first module is a connection module, electrical connections running into the switch interior starting from said connection module for connection purposes, and said connection module having first contacts to the outside, and wherein a second module is a manual plug module which is able to be plugged by way of its second contacts onto the connection module, electrical connections passing to the outside starting from said manual plug module for connection purposes, wherein a third module is a communication module which comprises communication electronics and which has second contacts on one contact side and first contacts on the opposite averted contact side, wherein the communication module is able to be plugged by way of its second contacts onto the connection module and the manual plug module is able to be plugged by way of its second contacts onto the communication module and wherein second contacts of the communication module are electrically connected to first contacts of the communication module or to the communication electronics, characterized in that the communication module is in the form of a communication adapter and the communication electronics are able to be plugged onto the communication adapter, in that the communication adapter respectively has the first contacts and the second contacts on opposite contact sides which are averted from one another, wherein the communication electronics are able to be plugged onto the communication adapter on one of the two sides which run transverse to the contact sides. comprising modules (3, 4, 5) which are able to be plugged one onto the other, wherein first contacts of one module (3 or 4) each make contact with second contacts of the module (4 or 5) which is plugged on first said module, wherein a first module is a connection module, electrical connections running into the switch interior starting from said connection module for connection purposes, and said connection module having first contacts to the outside, and wherein a second module is a manual plug module which is able to be plugged by way of its second contacts onto the connection module, electrical connections passing to the outside starting from said manual plug module for connection purposes, wherein a third module is a communication module which comprises communication electronics and which has second contacts on one contact side and first contacts on the opposite averted contact side, wherein the communication module is able to be plugged by way of its second contacts onto the connection module and the manual plug module is able to be plugged by way of its second contacts onto the communication module and wherein second contacts of the communication module are electrically connected to first contacts of the communication module or to the communication electronics, characterized in that the communication module is in the form of a communication adapter and the communication electronics are able to be plugged onto the communication adapter, in that the communication adapter respectively has the first contacts and the second contacts on opposite contact sides which are averted from one another, wherein the communication electronics are able to be plugged onto the communication adapter on one of the two sides which run transverse to the contact sides.