Accessory keys are movable elements mounted on the mechanisms of switches (i.e. light switches) or other electrical installation devices that enable their operation. This key is what you press to turn the light on or off, control the blinds or run other functions.

Accessory plaques are decorative or functional elements mounted on electrical installation equipment, such as sockets, switches or other devices. These are most often front elements that cover the mechanism and serve both an aesthetic and protective function.