Drive system for electrical switching devices for medium-voltage switchgear assemblies with a different function, in particular circuit breakers, load switch disconnectors, switch disconnectors or grounding switches, which has drive springs (6, 7) which are loaded via operating shafts (4, 5) and act on an output shaft which is connected to the switching element of a switching device, characterized in that the drive system is in the form of a modular drive system which, by the addition or omission of individual components, both as a three-position switch with a snap-action or storage drive function and as a two-position circuit breaker which can also have a brief interruption function added to it, and, as a basic drive, comprises a first operating shaft, which is connected to a first drive spring and is connected via the output shaft to the switching element of the switching device, and a second operating shaft, which is connected to the first operating shaft such that they engage, in which case a) the first drive spring is associated with a first blocking catch which is connected to a cam disk, for switching the OFF and GROUNDED position, and a second blocking catch for switching the ON and OFF position for a three-position disconnector with a snap-action function; or b) the second operating shaft is associated with a second drive spring and a second storage blocking catch, which corresponds thereto, in combination with a second tripping half-shaft, and the first drive spring is associated with a first storage blocking catch in combination with a first tripping half-shaft for switching the ON and OFF position as a storage function; in which case - in the case of a three-position disconnector, the switching between the OFF and GROUNDED position also takes place as a snap-action function via the first tripping spring and the first blocking catch; or - when used for a two-position load disconnector, the first and second blocking catches (8, 9) are removed; and c) when used as a two-position load disconnector with OFF-ON-OFF brief interruption a clutch comprising first and second clutch disks (15, 16) which are connected via a jointly rotating storage blocking catch, which is temporarily held on the second tripping half-shaft, and an additional drive spring, which corresponds to the storage blocking catch, are arranged between the output shaft and the switching device, in order to achieve the OFF position. a) the first drive spring is associated with a first blocking catch which is connected to a cam disk, for switching the OFF and GROUNDED position, and a second blocking catch for switching the ON and OFF position for a three-position disconnector with a snap-action function; or b) the second operating shaft is associated with a second drive spring and a second storage blocking catch, which corresponds thereto, in combination with a second tripping half-shaft, and the first drive spring is associated with a first storage blocking catch in combination with a first tripping half-shaft for switching the ON and OFF position as a storage function; in which case - in the case of a three-position disconnector, the switching between the OFF and GROUNDED position also takes place as a snap-action function via the first tripping spring and the first blocking catch; or - when used for a two-position load disconnector, the first and second blocking catches (8, 9) are removed; and - in the case of a three-position disconnector, the switching between the OFF and GROUNDED position also takes place as a snap-action function via the first tripping spring and the first blocking catch; or - when used for a two-position load disconnector, the first and second blocking catches (8, 9) are removed; and c) when used as a two-position load disconnector with OFF-ON-OFF brief interruption a clutch comprising first and second clutch disks (15, 16) which are connected via a jointly rotating storage blocking catch, which is temporarily held on the second tripping half-shaft, and an additional drive spring, which corresponds to the storage blocking catch, are arranged between the output shaft and the switching device, in order to achieve the OFF position.