Device for handling racks of disposable pipette tips in a laboratory automation system, the device comprising - a loading region, - a supply region, and - at least one guide rail for guiding racks from the loading region along a movement direction lying in a horizontal plane to the supply region, wherein the loading region is accessible by a user or a loading means for loading at least one rack on the at least one guide rail, and wherein the at least one guide rail is adapted to receive a plurality of racks, wherein a rack moving mechanism is provided for moving the racks one by one towards and/or into the supply region, wherein a plurality of disposable pipette tips stored in a supplying rack located in the supply region is accessible by a delivering device for delivering at least one selected one of the plurality of disposable pipette tips to a pipetting system, wherein the device is a drawer unit comprising a drawer module, which drawer module is moveable between a use position and an eject position, wherein at least one sensor is provided for detecting a removal of the supplying rack from the supply region, a presence of the supplying rack in the supply region, a state of the rack moving mechanism, a state of the drawer module and/or a state of an openable window provided at the cover of the device, characterized in that the device comprises at least one moveable block, which is controllably moveable by means of a driving device between a support position and a release position for selectively enabling or disabling a removal of the supplying rack from the supply region, wherein in the support position the at least one moveable block extends the at least one guide rail in the longitudinal direction of the guide rail, at the supply region the supplying rack is placed on the at least one moveable block arranged in the support position, and the at least one moveable block is moved into the release position for a removal of the supplying rack from the supply region in a downward direction, in that at the supply region at least one abutment surface is provided perpendicular to the movement direction of the supplying rack along the at least one guide rail, wherein a pusher is provided, and wherein the supplying rack is forced against the abutment surface by means of the pusher, in that the device is provided with a cover having an openable window, wherein for allowing access to the guide rails, the window is opened, and wherein after the window is opened, the loading region is accessible by a user or a loading means for placing at least one rack on the guide rails. - a loading region, - a supply region, and - at least one guide rail for guiding racks from the loading region along a movement direction lying in a horizontal plane to the supply region, wherein the loading region is accessible by a user or a loading means for loading at least one rack on the at least one guide rail, and wherein the at least one guide rail is adapted to receive a plurality of racks, wherein a rack moving mechanism is provided for moving the racks one by one towards and/or into the supply region, wherein a plurality of disposable pipette tips stored in a supplying rack located in the supply region is accessible by a delivering device for delivering at least one selected one of the plurality of disposable pipette tips to a pipetting system, wherein the device is a drawer unit comprising a drawer module, which drawer module is moveable between a use position and an eject position, wherein at least one sensor is provided for detecting a removal of the supplying rack from the supply region, a presence of the supplying rack in the supply region, a state of the rack moving mechanism, a state of the drawer module and/or a state of an openable window provided at the cover of the device, characterized in that the device comprises at least one moveable block, which is controllably moveable by means of a driving device between a support position and a release position for selectively enabling or disabling a removal of the supplying rack from the supply region, wherein in the support position the at least one moveable block extends the at least one guide rail in the longitudinal direction of the guide rail, at the supply region the supplying rack is placed on the at least one moveable block arranged in the support position, and the at least one moveable block is moved into the release position for a removal of the supplying rack from the supply region in a downward direction, in that at the supply region at least one abutment surface is provided perpendicular to the movement direction of the supplying rack along the at least one guide rail, wherein a pusher is provided, and wherein the supplying rack is forced against the abutment surface by means of the pusher, in that the device is provided with a cover having an openable window, wherein for allowing access to the guide rails, the window is opened, and wherein after the window is opened, the loading region is accessible by a user or a loading means for placing at least one rack on the guide rails.