Lever latches with key in certified self-extinguishing UL-94 V0 glass fibre reinforced polyamide-based technopolymer, packing ring applied directly to the stator underhead, washer with elastic fixing tabs and stainless steel self-tapping screw, key in polyamide-based technopolymer, 90° rotation and degree of protection IL 65 in accordance with table EN 60529.