An electronic “switch” that sits at the start of the lighting circuit and turns the 240v on/off at the same time issuing a 1-10v dim signal to the drivers. A typical application is a group of downlights on one circuit, each downlight has a 1-10v driver wired with 2 core control wire.
The Hue Connect 1-10v is seen in the Hue app and gives wireless control of the lighting circuit. Max 300w load or 8 x 1-10v drivers. Can also switch a load eg a 300w halogen pendant. Friends of Hue product.