A system for the communication between an electronic trip unit and a communication device, the system comprising: an electronic trip unit, the electronic trip unit comprising: a housing, the housing being structurally configured for the releasable connection to a modular plug-in device; a microcontroller situated within the housing; a communication module plug-in device arranged, in use, to be in electrical communication with the electronic trip unit, the communication module plug-in device comprising a housing, the housing being structurally configured for the releasable connection to an electronic trip unit, wherein the housing facilitates electronic communication between the communication plug-in device and the electronic trip unit; a communication controller situated within the housing; a transceiver situated within the housing, wherein the transceiver is in communication with the communication controller; and a memory storage device situated within the housing, the memory storage device being in communication with the communication controller and the transceiver; wherein the device is associated with a unique electronic identification code, the unique identification code being stored at the device; characterized in that the unique electronic identification code of the device is associated with at least one set of software instructions that are stored at a memory comprised within the electronic trip unit, wherein the communication controller being configured to deliver the unique identification code from the communication plug-in device to the electronic trip unit such that when a communication plug-in module is connected to an electronic trip unit, a set of instructions that is stored upon the device can thereafter be accessed and executed to serve the purposes of the connected communication plug-in module. an electronic trip unit, the electronic trip unit comprising: a housing, the housing being structurally configured for the releasable connection to a modular plug-in device; a microcontroller situated within the housing; a communication module plug-in device arranged, in use, to be in electrical communication with the electronic trip unit, the communication module plug-in device comprising a housing, the housing being structurally configured for the releasable connection to an electronic trip unit, wherein the housing facilitates electronic communication between the communication plug-in device and the electronic trip unit; a communication controller situated within the housing; a transceiver situated within the housing, wherein the transceiver is in communication with the communication controller; and a memory storage device situated within the housing, the memory storage device being in communication with the communication controller and the transceiver; a housing, the housing being structurally configured for the releasable connection to a modular plug-in device; a microcontroller situated within the housing; a communication module plug-in device arranged, in use, to be in electrical communication with the electronic trip unit, the communication module plug-in device comprising a housing, the housing being structurally configured for the releasable connection to an electronic trip unit, wherein the housing facilitates electronic communication between the communication plug-in device and the electronic trip unit; a communication controller situated within the housing; a transceiver situated within the housing, wherein the transceiver is in communication with the communication controller; and a memory storage device situated within the housing, the memory storage device being in communication with the communication controller and the transceiver;