System 3000 Universal LED Dimmer Module Comfort - Switch and dim incandescent lamps, HV halogen lamps, electronic transformers for halogen or LED lamps, dimmable inductive transformers for halogen or LED lamps, as well as HV LED or compact fluorescent lamps. Connection of additional controls is possible. Automatic or manual adjustment of the dimming principle suitable for the load (phase control or phase cut-off). Display of the selected operating mode via LED. Gentle switching on for the lamps. The brightness at switch-on can be permanently stored. Switch-on with the last set brightness or the stored switch-on brightness. Hotel card function can be activated: light turns "on" after a power interruption. Minimum brightness can be adjusted. Electronic short circuit protection. Electronic over-temperature protection. Operation possible with and without neutral wire connection. Generally, the dimmer can operate without a neutral wire connection; however, some LED and CFLi light sources require a neutral wire connection to avoid flickering. When operating without a neutral wire, the minimum load for incandescent lamps, HV halogen, Tronic transformers, and wound transformers increases to 50 W. Electronic transformers and ballasts for LED light sources can be operated according to the dimming method specified by the manufacturer. If the ambient temperature exceeds 25 °C, the connected load must be reduced.