A sprinkler which comprises a sprinkler frame (2), in which there is at least one nozzle (3), a heat-activated triggering element (5), and a protective element (8) which is in front of the nozzle (3) in the protective position and mechanically protects the triggering element (5) when the sprinkler is in a non-active mode, and which protective element (8) is movable to a second position in which the nozzles (3) and the triggering element (5) are not protected by the protective element (8). The sprinkler frame (2) is movable in relation to a fastening frame (1) between two positions, a first position in which the sprinkler is in a non-active mode, and a second position in which the sprinkler frame is protruding, and which sprinkler frame (2) is arranged movable from the effect of the pressure of medium in relation to the fastening frame (1) from the first position to the second position and at the same time to direct a force to the protective element (8) for moving it from the protective position to the second position, whereby the sprinkler is in the second position of the sprinkler frame set to a standby mode.