Abstract: A power-rail adapter (39) for mechanical and electrical connection of a light fixture (10) and/or of an operating unit (15) of the light fixture with a power rail (28), comprising at least a switch shaft (41) that can be pivoted between a removing position in which the adapter is removable from the power rail and an installing position in which the adapter is fixed to the power rail is illustrated and described. A specific feature is amongst others that a coding stud (66) is provided on the switch shaft and that a coding groove (77) is provided at the power rail in which the coding stud can be introduced only with a single relative orientation of the adapter (39) with respect to the power rail (28) with pivoting of the switch shaft from the removing position into the installing position.

Abstract: A power-rail adapter (39) for mechanical and electrical connection of a light fixture (10) and/or of an operating unit (15) of the light fixture with a power rail (28), comprising at least a switch shaft (41) that can be pivoted between a removing position in which the adapter is removable from the power rail and an installing position in which the adapter is fixed to the power rail is illustrated and described. A specific feature is amongst others that a coding stud (66) is provided on the switch shaft and that a coding groove (77) is provided at the power rail in which the coding stud can be introduced only with a single relative orientation of the adapter (39) with respect to the power rail (28) with pivoting of the switch shaft from the removing position into the installing position.