Universal switch insert 1-way (R, L, C, LED). Universal switch insert 1-way, low energy consumption, automatic setting of the minimum starting brightness for 230 V LED and energy-saving lamps, lamp-friendly soft start, phase leading or trailing edge depending on the load type, self-learning, short-circuit proof and overload proof (electronic fuse), optional fine adjustment of the load type, with extension input for button (normally open) with single-surface operation and motion detector extension, can be expanded using universal power add-ons Plus REG, also suitable for attaching suitable KNX radio attachments, no conductive connection between the support ring and the spreading claws, with screw terminals.