Registered Community Design 349733-0001. Suitable for control of dimmable electronic transformers, toroidal transformers and tungsten lamps WITHOUT de-rating. Not suitable for use with fluorescent lamps. Leading edge phase control. For use with resistive and inductive loads. Integrated over-temperature protection fuse. Smooth dimming operation from 0-100% light output. Allows dimming control where traditionally only a switch would fit. May be surface mounted with pattress supplied or semi-recessed mounted using a recessed mounting box (not supplied). Complies with the latest Electrical Safety standard for dimmer switches EN 60669-2-1:2000. EMC compliance - EN 55015. 1 Year guarantee.