The Display Interface is an ‘Ex ia’ panel mounted WVGA 480×272 pixel 24-bit full colour LCD with a membrane keypad which integrates system functionality. This display, together with the keypad has the advantage of reducing the wiring overhead for each outlet by integrating test and runtime functionality. The interface is robust, easy to use and enables the user to view system status, modify protection functions and debug trip issues using the comprehensive event log database.The PD1 is powered by the EP081 IS power supply and communicates with the ECM through the EP051 intrinsically safe communications barrier.