Device for cooling at least one electronic component board, comprising: - a frame, comprising at least one slide slot for receiving an edge of the plate, the slide slot being defined by a locking face and a pressure face opposite the locking face, - a locking device for holding the plate in position in the frame, the locking device having a holding member for receipt in the slide slot, the holding member being flexible and preferably having a generally elongate shape, the holding member having a holding configuration in which the holding member is flexed to press the edge of the plate against the pressure face when the edge of the plate is received in the slide slot, and a release configuration in which the holding member is straightened and allows movement of the plate in the slide slot, the locking device having a locking member connected to the holding member, and movable between an unlocked position and a locked position, such that the locking member drives the holding member to its holding configuration when it moves from its unlocked position to its locked position, and drives the holding member to its release configuration when it moves from its locked position to its unlocked position; and characterised in that the holding element comprises: - a U-shaped profile of longitudinal axis (X-X'), defining a profile volume; and wherein the locking element comprises: - a locking bar extending into the profile space, - a blocking member at a first end of the locking bar, and - a clamping member, arranged at a second end of the locking bar, the clamping member being longitudinally movable relative to the locking bar, to move the locking element between its unlocked and locked positions, the U-shaped profile being clamped longitudinally between the clamping member and the blocking member when the locking element is in its locked position, the longitudinal clamping of the U-shaped profile causing the channel to flex. - a frame, comprising at least one slide slot for receiving an edge of the plate, the slide slot being defined by a locking face and a pressure face opposite the locking face, - a locking device for holding the plate in position in the frame, the locking device having a holding member for receipt in the slide slot, the holding member being flexible and preferably having a generally elongate shape, the holding member having a holding configuration in which the holding member is flexed to press the edge of the plate against the pressure face when the edge of the plate is received in the slide slot, and a release configuration in which the holding member is straightened and allows movement of the plate in the slide slot, the locking device having a locking member connected to the holding member, and movable between an unlocked position and a locked position, such that the locking member drives the holding member to its holding configuration when it moves from its unlocked position to its locked position, and drives the holding member to its release configuration when it moves from its locked position to its unlocked position; and characterised in that the holding element comprises: - a U-shaped profile of longitudinal axis (X-X'), defining a profile volume; and wherein the locking element comprises: - a locking bar extending into the profile space, - a blocking member at a first end of the locking bar, and - a clamping member, arranged at a second end of the locking bar, - a U-shaped profile of longitudinal axis (X-X'), defining a profile volume; and wherein the locking element comprises: - a locking bar extending into the profile space, - a blocking member at a first end of the locking bar, and - a clamping member, arranged at a second end of the locking bar, - a locking bar extending into the profile space, - a blocking member at a first end of the locking bar, and - a clamping member, arranged at a second end of the locking bar, the clamping member being longitudinally movable relative to the locking bar, to move the locking element between its unlocked and locked positions, the U-shaped profile being clamped longitudinally between the clamping member and the blocking member when the locking element is in its locked position, the longitudinal clamping of the U-shaped profile causing the channel to flex.