Fastening device for placement on a mounting rail

摘要

A fastening device (21) for placement on a mounting rail having a back-engagement part (22) for insertion into a mounting opening of the mounting rail and for engaging behind edges of the mounting opening of the mounting rail, having a support plate (42) for coming in contact 5 with the mounting rail on the outside, having a spring element (52) for prestressing the back engagement part (22) in a circumferential direction with respect to an axis of rotation (27) of the back-engagement part (22), which is perpendicular to a plane (E) spanned by the support plate (42), and having a holding device (31) for holding the back-engagement part (22) in a prestressed position, such that the back-engagement part (22) is transferrable from the 10 insertion position into an engagement position engaging behind the edges of the mounting opening by spring element (52) when the holding device (31) is released. The holding device (31) includes a holding element (32) which for the release of the holding device (31) is displaceable axially relative to the plane (E) spanned by the support plate (42) with respect to the axis of rotation (27) of the back-engagement part (22). 15 (Figure 3)