ABS material casings with rounded corners. Standard available colours are RAL 9004 and RAL 7035. The basis of the casing has integral fastening pins for the PCB plate. It has a matte surface finishing. Mounted with two or four screws. All casings have fastening eyes. KM-54, KM-31NB casings have a wiring opening on the bigger side. KM-31NO and KM-53B casings are available with ventilation openings. KM-53 and KM-53B casings also have a front panel and an opening on the cover suitable for a membrane keypad, a label or displays.