An adapter system for busbars comprising an adapter for busbars and an adapter connection module, which may be connected with one another to provide an operating position of the adapter system. wherein the adapter for busbars has the following: - at least two contact connections for connecting the adapter to a busbar system with at least two busbars (12, 14, 16), - a housing, which has at least two openings (201, 202, 203) for accommodating in each case one pole of a first multipolar connecting device of the adapter connection module, - a cable connecting device, disposed in the housing of the adapter and having a spring clamp structure and a lever switch, which are designed, so that the spring clamp structure exerts a spring force, which, on the one hand, pretensions the lever switch in an ON position and, on the other, exerts a force on all inserted poles of the first connecting device, so that these cannot be removed from the cable connecting device when the lever switch is in the ON position, wherein the lever switch can be moved from its ON position into an actuation position against the force exerted by the spring clamp structure, so that, in the actuating position of the lever switch, all the inserted poles of the first connecting device can be removed from the cable connecting device, wherein the adapter connecting module has the following: - a housing, from which at least two poles (401, 402, 403) of the first connecting device protrude for insertion into the at least two openings (201, 202, 203) of the housing of the adapter for busbars and which has a second, at least bipolar connecting device for connecting an electrical load, wherein the first connecting device is connected to the second connecting device via an interruptible bridge circuit, - a main switch, which can be switched back and forth between an ON position and an OFF position, - an actuating lever for actuating the lever switch of the adapter for busbars, the operating lever being movable between an operating position and an actuation position, the bridge circuit being in its ON position when the main switch is in the ON position, and wherein the bridge circuit is in its disconnected position when the main switch is in its OFF position and wherein the main switch, on one of its components, has an opening, which is disposed and designed so that the actuating lever of the adapter connecting module can be forced into its actuating position by means of a tool, which can be introduced through this opening in the main switch in the housing of the adapter connecting module, when the main switch is in its switched-off position, this opening of the main switch being closed by an element of the adapter connecting module, when the main switch is in its switched-on position. - at least two contact connections for connecting the adapter to a busbar system with at least two busbars (12, 14, 16), - a housing, which has at least two openings (201, 202, 203) for accommodating in each case one pole of a first multipolar connecting device of the adapter connection module, - a cable connecting device, disposed in the housing of the adapter and having a spring clamp structure and a lever switch, which are designed, so that the spring clamp structure exerts a spring force, which, on the one hand, pretensions the lever switch in an ON position and, on the other, exerts a force on all inserted poles of the first connecting device, so that these cannot be removed from the cable connecting device when the lever switch is in the ON position, wherein the lever switch can be moved from its ON position into an actuation position against the force exerted by the spring clamp structure, so that, in the actuating position of the lever switch, all the inserted poles of the first connecting device can be removed from the cable connecting device, - a housing, from which at least two poles (401, 402, 403) of the first connecting device protrude for insertion into the at least two openings (201, 202, 203) of the housing of the adapter for busbars and which has a second, at least bipolar connecting device for connecting an electrical load, wherein the first connecting device is connected to the second connecting device via an interruptible bridge circuit, - a main switch, which can be switched back and forth between an ON position and an OFF position, - an actuating lever for actuating the lever switch of the adapter for busbars, the operating lever being movable between an operating position and an actuation position, the bridge circuit being in its ON position when the main switch is in the ON position, and wherein the bridge circuit is in its disconnected position when the main switch is in its OFF position and