System 3000 universal LED rotary dimming insert Standard Features: Switching and dimming light bulbs, 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 dimming principle according to load (leading or trailing edge). Bulb-saving switch-on. 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 and without neutral conductor connection. Notes : In general, operating the dimmer without connecting a neutral conductor is possible, although some LED and CFLi light sources require the neutral conductor connection to prevent flickering. For operation without a neutral conductor, the minimum load for light bulbs, HV halogen lamps, Tronic transformers, and wound transformers increases to 50 W. Electronic transformers and ballast devices for LED lamps can be operated with the dimming procedure stated by the manufacturer. If the ambient temperature is higher than 25 C, the connected load must be reduced.