System 3000 universal LED rotary dimmer insert Standard features: Switching and dimming of incandescent lamps, HV halogen lamps, electronic transformers for halogen or LED lamps, dimmable inductive transformers for halogen or LED lamps, HV LED or compact fluorescent lamps. Automatic setting of the dimming principle that suits the load (leading edge or trailing edge). Lamp-friendly switching on. Switch-on brightness can be saved permanently. Switch on with last set brightness or saved switch-on brightness. Minimum brightness adjustable. Electronic short-circuit protection. Electronic overtemperature protection. Operation with and without neutral conductor connection. Notes: In principle, the dimmer can be operated without connecting the neutral conductor, but some LED and CFLi lamps require the neutral conductor connection to avoid flickering. When operating without a neutral conductor, the minimum load for incandescent lamps, HV halogen, Tronic transformers and wound transformers increases to 50 W. Electronic transformers and ballasts for LED lamps can be operated using the dimming method specified by the manufacturer. If the ambient temperature is higher than 25 C, the connected load must be reduced.