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 each comprising a first end connected to the vacuum switch and a second end located opposite the first end relative to the vacuum switch , the first and second connections extending such that for each of the first and second connections , the distance between the second end and the support is greater than the distance between the first end and the support , the distances being measured along an elevation direction (B) 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 , in that the assembly formed by the circuit breaker and the first and second electrical connections has a maximum height of less than 450 millimeters, the height being measured along the elevation direction (B), and in that the electrical connections 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 each comprising a first end connected to the vacuum switch and a second end located opposite the first end relative to the vacuum switch , the first and second connections extending such that for each of the first and second connections , the distance between the second end and the support is greater than the distance between the first end and the support , the distances being measured along an elevation direction (B) 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 , in that the assembly formed by the circuit breaker and the first and second electrical connections has a maximum height of less than 450 millimeters, the height being measured along the elevation direction (B), and in that the electrical connections 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. <EOS>