A circuit breaker for connecting two line segments (92, 94) of a facility for handling pressurized fluid, the circuit breaker including a male element and a female element that are intended to fit in one another along a fitting axis, the male element including a male body defining a first inner pipe for circulating pressurized fluid and provided with - at least one member (110, 112, 167; 102H) for closing off a front end of the first inner pipe along the fitting axis, - at least one first passage, radial with respect to the fitting axis and connecting the first inner pipe to the outside of the male body in the uncoupled configuration of the male and female elements of the circuit breaker, - a valve, movable in the first inner pipe, and - a locking notch arranged on the male body the female element including a female body defining a second inner pipe for the circulation of pressurized fluid and provided with - at least one second passage, radial with respect to the fitting axis and connecting the second inner pipe to a volume (Va) receiving the male body in the female body, - a valve movable in the second inner pipe, - several locking members movable transversely with respect to the fitting axis, in housings of the female body, between a first radial position, where the locking members are engaged in the locking notch, for the axial locking of the male body with the female body in the coupled configuration of the male and female elements of the circuit breaker, and a second radial position, where the locking members free the passage of the male body in the female body, wherein, in the coupled configuration, the first and second radial passages (116, 256) are in communication, while a first sealing gasket and a second sealing gasket are arranged, along the fitting gasket, on either side of the first and second radial passages (116, 256) and respectively cooperate radially with the male and female bodies, characterized in that a resilient return ring is mounted on the female body and surrounds the locking members, this ring being configured to resiliently return the locking members toward their first radial position in the coupled configuration and to be deformed radially, and resiliently, by the locking members during their movement, from their first radial position toward their second radial position. the male element including a male body defining a first inner pipe for circulating pressurized fluid and provided with - at least one member (110, 112, 167; 102H) for closing off a front end of the first inner pipe along the fitting axis, - at least one first passage, radial with respect to the fitting axis and connecting the first inner pipe to the outside of the male body in the uncoupled configuration of the male and female elements of the circuit breaker, - a valve, movable in the first inner pipe, and - a locking notch arranged on the male body - at least one member (110, 112, 167; 102H) for closing off a front end of the first inner pipe along the fitting axis, - at least one first passage, radial with respect to the fitting axis and connecting the first inner pipe to the outside of the male body in the uncoupled configuration of the male and female elements of the circuit breaker, - a valve, movable in the first inner pipe, and - a locking notch arranged on the male body the female element including a female body defining a second inner pipe for the circulation of pressurized fluid and provided with - at least one second passage, radial with respect to the fitting axis and connecting the second inner pipe to a volume (Va) receiving the male body in the female body, - a valve movable in the second inner pipe, - several locking members movable transversely with respect to the fitting axis, in housings of the female body, between a first radial position, where the locking members are engaged in the locking notch, for the axial locking of the male body with the female body in the coupled configuration of the male and female elements of the circuit breaker, and a second radial position, where the locking members free the passage of the male body in the female body, - at least one second passage, radial with respect to the fitting axis and connecting the second inner pipe to a volume (Va) receiving the male body in the female body, - a valve movable in the second inner pipe, - several locking members movable transversely with respect to the fitting axis, in housings of the female body, between a first radial position, where the locking members are engaged in the locking notch, for the axial locking of the male body with the female body in the coupled configuration of the male and female elements of the circuit breaker, and a second radial position, where the locking members free the passage of the male body in the female body, wherein, in the coupled configuration, the first and second radial passages (116, 256) are in communication, while a first sealing gasket and a second sealing gasket are arranged, along the fitting gasket, on either side of the first and second radial passages (116, 256) and respectively cooperate radially with the male and female bodies, characterized in that a resilient return ring is mounted on the female body and surrounds the locking members, this ring being configured to resiliently return the locking members toward their first radial position in the coupled configuration and to be deformed radially, and resiliently, by the locking members during their movement, from their first radial position toward their second radial position.