A MOUNTING SYSTEM

A mounting system comprising: a unit, e.g. a fire alarm, integrated into a housing (3), which housing (3) comprises locking means (34a-c) e.g. an electrical slide coupling, coupling means (210, 33a-c), and mounting means (134a-c); a bracket (4) comprising a coupling side (40a-c) arranged for receiving the housing (3), and a fastening side (8) with means for fastening the bracket (4) to a surface such as a ceiling or a wall. A mounting unit (2), with a mounting side (200) and a holding side (201), wherein the holding side (201) comprises a first set of mounting means (202a-c) that are mutually adapted to the housing's mounting means (134a-c), such that the mounting means (134a-c, 202a-c) are interconnected by coaxially guiding the housing (3) and mounting unit (2) towards each other. The housing (2) is rotated about its central axis, whereby the mounting means (134a-c, 202a-c) are successively interconnected or released as the housing is rotated one or more turns.; mounting means (210) will grasp and hold housing (2). The coupling and decoupling occur with different friction coefficients.