The IEC 309 HP system comprises plugs and socket-outlets from 16 to 125A in two different versions – straight mobile and 10° flush-mounting – available in protected versions with IP44/IP54 degree of protection and watertight versions with IP degree of protection of up to IP66/IP67/IP68/IP69 (the first and only on the electro-technical scene to have this). The introduction of all the clock references for the earthing contact completes the range for specific applications and installations. The 16-32A versions require screw or quick spring wiring, while the 63-125 A versions employ branching terminal connection technology.