Rail vehicle comprising an electrical disconnecting device for a rail vehicle, the rail vehicle comprising a roof, the device comprising: - a support extending substantially along a longitudinal plane; - a circuit breaker comprising a vacuum switch, an actuator and a drive module connecting the vacuum switch to the actuator, the circuit breaker extending substantially parallel to the longitudinal plane of the support; - a first electrical connection and a second electrical connection that are each able to connect the vacuum switch to an outside electrical contact, the first and second electrical connections (16A, 16B) each comprising a first end (44A, 44B) connected to the vacuum switch and a second end (46A, 46B) located opposite the first end (44A, 44B) relative to the vacuum switch, the first and second connections (16A, 16B) extending such that for each of the first and second connections (16A, 16B), the distance between the second end (46A, 46B) and the support is greater than the distance between the first end (44A, 44B) and the support, the distances being measured along an elevation direction substantially normal to the longitudinal plane of the support, the support being formed by at least part of the roof of the rail vehicle or formed by a plate fastened to at least part of the roof of the rail vehicle, characterized in that the circuit breaker extends between the support and the first and second electrical connections (16A, 16B), in that the assembly formed by the circuit breaker and the first and second electrical connections (16A, 16B) has a maximum height of less than 450 millimeters, the height being measured along the elevation direction, and in that the electrical connections (16A, 16B) extend on a first side of the circuit breaker and the support extends on a second side of the circuit breaker, opposite the first side. - a support extending substantially along a longitudinal plane; - a circuit breaker comprising a vacuum switch, an actuator and a drive module connecting the vacuum switch to the actuator, the circuit breaker extending substantially parallel to the longitudinal plane of the support; - a first electrical connection and a second electrical connection that are each able to connect the vacuum switch to an outside electrical contact, the first and second electrical connections (16A, 16B) each comprising a first end (44A, 44B) connected to the vacuum switch and a second end (46A, 46B) located opposite the first end (44A, 44B) relative to the vacuum switch, the first and second connections (16A, 16B) extending such that for each of the first and second connections (16A, 16B), the distance between the second end (46A, 46B) and the support is greater than the distance between the first end (44A, 44B) and the support, the distances being measured along an elevation direction substantially normal to the longitudinal plane of the support, the support being formed by at least part of the roof of the rail vehicle or formed by a plate fastened to at least part of the roof of the rail vehicle, characterized in that the circuit breaker extends between the support and the first and second electrical connections (16A, 16B), in that the assembly formed by the circuit breaker and the first and second electrical connections (16A, 16B) has a maximum height of less than 450 millimeters, the height being measured along the elevation direction, and in that the electrical connections (16A, 16B) extend on a first side of the circuit breaker and the support extends on a second side of the circuit breaker, opposite the first side.