Gas-insulated switchgear bay (1, 10) having at least three conductor phases for different electrical potentials, wherein each conductor phase can be interrupted by its own circuit breaker (2a, 2b, 2c), and wherein the shapes of the circuit breakers (2a, 2b, 2c) define a longitudinal direction, and wherein at least one of the circuit breakers (2a, 2b, 2c) has a first power connection (4a, 4b, 4c) which defines a first axis (5a, 5b, 5c) which extends orthogonally with respect to the longitudinal direction, and wherein the circuit breaker (2a, 2b, 2c) has a second power connection (6a, 6b, 6c) which extends orthogonally with respect to the longitudinal direction in the same direction as the first power connection (4a, 4b, 4c) and which second power connection (6a, 6b, 6c) defines a second axis (7a, 7b, 7c), wherein the circuit breaker (2a, 2b, 2c) can be electrically conductively connected via the first power connection (4a, 4b, 4c) to a respective gas-insulated first busbar conductor (15a, 15b, 15c) of a first busbar section, such that the first busbar conductor (15a, 15b, 15c) defines a third axis (16a, 16b, 16c) which extends orthogonally with respect to the longitudinal direction and orthogonally with respect to the first axis (5a, 5b, 5c) and orthogonally with respect to the second axis (7a, 7b, 7c), and wherein the first busbar section has a first busbar housing in which all of the first busbar conductors (15a, 15b, 15c) are arranged in a common gas area, characterized in that a first distance between the first axis (5a, 5b, 5c) and the second axis (7a, 7b, 7c) is of such a size that a) the switchgear bay has a first busbar section which is electrically connected to the first power connection (4a, 4b, 4c), in a first mounting state, b) the switchgear bay has a second busbar section which is electrically connected to the second power connection (6a, 6b, 6c) and has a gas-insulated second busbar conductor (46a, 46b, 46c), in a second mounting state, which second busbar conductor (46a, 46b, 46c) defines a fourth axis (47a, 47b, 47c), wherein the fourth axis (47a, 47b, 47c) is arranged with respect to position and orientation on a common straight line with the third axis (16a, 16b, 16c) in the second mounting state, and wherein the second busbar section has a second busbar housing in which all of the second busbar conductors (46a, 46b, 46c) are arranged in a common gas area. a) the switchgear bay has a first busbar section which is electrically connected to the first power connection (4a, 4b, 4c), in a first mounting state, b) the switchgear bay has a second busbar section which is electrically connected to the second power connection (6a, 6b, 6c) and has a gas-insulated second busbar conductor (46a, 46b, 46c), in a second mounting state, which second busbar conductor (46a, 46b, 46c) defines a fourth axis (47a, 47b, 47c), wherein the fourth axis (47a, 47b, 47c) is arranged with respect to position and orientation on a common straight line with the third axis (16a, 16b, 16c) in the second mounting state, and wherein the second busbar section has a second busbar housing in which all of the second busbar conductors (46a, 46b, 46c) are arranged in a common gas area.