Gas-insulated electrical assembly comprising at least one first module and at least one second module which is mechanically connected to the first module, wherein at least the first module is a module comprising a housing and an internal conductor which is located in the housing at least in sections, wherein - the module (10, 510, 520) has a module-specific closure element which closes the housing at a housing opening and comprises an insulator element, - the insulator element has a passage hole into which the internal conductor projects or through which the internal conductor projects outwards into an interface region which is located outside the housing and adjoins the insulator element and is suitable for connection of a further gas-insulated electrical module (10, 510, 520), and - the closure element has a gas-conducting element which can be controlled from the outside, allows gas flow between the interior of the housing and the interface region in an open state and closes the closure element in a gas-tight manner in a closed state, - the second module has a module-specific closure element which closes a housing of the second module at a housing opening and comprises an insulator element, - the insulator element of the second module has a passage hole into which an internal conductor of the second module projects or through which the internal conductor projects out in the direction of the first module, and - the closure elements of the two modules delimit an intermediate section between them, wherein - the intermediate section between the closure element of the first module and the closure element of the second module is separated in terms of gas flow from the interior of the first module in the closed state of the gas-conducting element of the first module that can be controlled from the outside, and - the intermediate section is connected in terms of flow to the interior of the first module in the open state of the gas-conducting element of the first module that can be controlled from the outside, characterized in that - the controllable gas-conducting element has at least three connections, a first connection of which is connected to the interior of the housing, a second connection of which is connected to the interface region and therefore to the intermediate section and a third connection of which is connected to an external region outside the module (10, 510, 520) and renders possible a gas flow connection to an external gas or vacuum source which is located outside the module (10, 510, 520), and - the gas-conducting element is a directional valve which closes the first connection in a first valve position, connects the first and the second connection to one another in terms of flow in a second valve position, connects the third connection exclusively to the first connection in a third valve position and closes the first connection and connects the second and the third connection to one another in terms of flow in a fourth valve position. - the module (10, 510, 520) has a module-specific closure element which closes the housing at a housing opening and comprises an insulator element, - the insulator element has a passage hole into which the internal conductor projects or through which the internal conductor projects outwards into an interface region which is located outside the housing and adjoins the insulator element and is suitable for connection of a further gas-insulated electrical module (10, 510, 520), and - the closure element has a gas-conducting element which can be controlled from the outside, allows gas flow between the interior of the housing and the interface region in an open state and closes the closure element in a gas-tight manner in a closed state, - the second module has a module-specific closure element which closes a housing of the second module at a housing opening and comprises an insulator element, - the insulator element of the second module has a passage hole into which an internal conductor of the second module projects or through which the internal conductor projects out in the direction of the first module, and - the closure elements of the two modules delimit an intermediate section between them, wherein - the intermediate section between the closure element of the first module and the closure element of the second module is separated in terms of gas flow from the interior of the first module in the closed state of the gas-conducting element of the first module that can be controlled from the outside, and - the intermediate section is connected in terms of flow to the interior of the first module in the open state of the gas-conducting element of the first module that can be controlled from the outside, characterized in that - the controllable gas-conducting element has at least three connections, a first connection of which is connected to the interior of the housing, a second connection of which is connected to the interface region and therefore to the intermediate section and a third connection of which is connected to an external region outside the module (10, 510, 520) and renders possible a gas flow connection to an external gas or vacuum source which is located outside the module (10, 510, 520), and - the gas-conducting element is a directional valve which closes the first connection in a first valve position, connects the first and the second connection to one another in terms of flow in a second valve position, connects the third connection exclusively to the first connection in a third valve position and closes the first connection and connects the second and the third connection to one another in terms of flow in a fourth valve position.