These dimmers are for use with high frequency ballasts or LED drivers that use a 1-10V DC control input. Adjust the rotary knob to control the brightness and push the knob to switch mains power on/off to the ballast/driver. The brightness control and mains switch are electrically isolated.
A single dimmer is designed to work with 1 or multiple ballasts/drivers. Refer to the data sheet of your ballast or driver: the total control current sourced by all drivers should not exceed 20mA. The total mains current should not exceed 6A. Fit inrush current limiters where necessary, or use an additional high current switch for the mains switching.
This type of dimmer requires an extra two-core cable because the dimming and switching functions are separate. The switching side is wired as a conventional switch to the mains. The dimming side is connected via an extra two-core cable to the positive and negative terminals on the dimmable ballast/LED driver. Please see the wiring diagram for more information.