Abstract: The device is adapted to break the circuit of the electrical system of the vehicle in the event of a tipping or overturning of the latter. The device comprises an elongated body containing two spaced-apart electrodes which are respectively connected to the positive terminal of the battery of the vehicle and to at least some of the electrical control or driving elements of the vehicle. The body contains an electrical conductive fluid in which the electrodes are immersed and is upwardly extended by two tubes which are perpendicular to the body and are interconnected in their upper part by a transfer pipe. A region of transition, located in the region of the connection of the body to the two tubes, is closed by a retarding diaphragm provided with a calibrated orifice. When the vehicle assumes an unusual inclination due to a tipping or overturning thereof, the fluid flows from the body into either of the tubes and thus breaks the circuit between the two electrodes.