A control cartridge (2) for installation in a cartridge housing (3) of a sanitary fitting (1) comprises a first feed opening (4) and a discharge opening (6) as well as one or more seals (7), which are configured for sealing abutment on an internal surface (8) of the cartridge housing (3). Said seals (7) are arranged in such a way that after the completed installation of the control cartridge (2) in a cartridge housing (3) of a sanitary fitting (1) the first feed opening (4) is joined in a sealed manner to a cold-water or mixed-water connection (9) of the sanitary fitting (1) and the discharge opening (6) is joined in a sealed manner to a discharge pipe (11) of the sanitary fitting (1). The first feed opening (4) in the cartridge housing (3) or in the control cartridge (2) is directly connected to the discharge opening (6) which is sealed with respect to the cartridge housing (3). The control cartridge (2) comprises a second feed opening (5) in which an electric line (12) is disposed which connects an electrical switch (13) of the control cartridge (2) to a valve (16) arranged in a cold-water or mixed-water feed pipe (14) at least for switching a water flow on and off.