The SET1 is suitable for edge protection with one set of OPTO sensors and consists of 2 connection boxes (type: LAD4) for mounting on a door, which are connected to each other via a connecting cable, which is available in different lengths. Connection box 1 (master) is equipped with a connection print (type: MODUL10) and a cover with gland with anti-kink grommet for the spiral cable. Connection box 2 (slave) is equipped with a connection board (type: MODUL11) and a closed lid. A slack cable switch and wicket door contact can also be connected to both connection boards.