2-wire power supply unit for distribution board installation (profile rail 35 mm) or surface mounting, built-in PTC fuse, input 230 V AC 50 Hz, output for BUS line 27 V DC 1.2 A, output for supplying additional devices such as activator or numeric keypad module 27 V DC, with electronic fuse 8 TE DIN, additional power supply unit, output 1-2