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System 3000 universal LED rotary dimming insert Standard - Switching and dimming light bulbs, HV halogen lamps, electronic transformers for halogen or LED lights, dimmable inductive transformers for halogen or LED lights, HV LED or compact fluorescent lamps. - Automatic setting of dimming principle according to load (leading or trailing edge). - Switch-on function that preserves the life of the lamp. - Switch-on brightness can be saved permanently. - Switch on with the last brightness set, or a saved switch-on brightness. - Minimum brightness can be set. - Electronic short-circuit protection. - Electronic excess-temperature protection. - Operation with or without a neutral conductor connection. In principle, it is possible to operate the dimmer without connecting the neutral conductor, but some LED and CFLi light sources make the neutral conductor connection necessary to avoid flickering. Operation without a neutral conductor increases the minimum load for light bulbs, HV halogen lamps, Tronic transformers and wound transformers to 50 W. Electronic transformers and ballast devices for LED lamps can be operated with the dimming procedure specified by the manufacturer. If the ambient temperature is higher than 25 °C, the connected load must be reduced.