Current measurement device, which device is arranged so as to be incorporated within a substantially parallelepipedal housing including an upstream face opposite a downstream face, a front face opposite a back face, and a first lateral face opposite a second lateral face, said current measurement device including: - at least two upstream connection lands (11, 21), which lands are intended to be electrically connected to connection lands (17, 27) of an electric current breaking device for protecting at least two electrical lines (19, 29); - at least two downstream connection lands (15, 25), which lands are intended to be electrically connected to operating terminals (16, 26); - at least two current conductors (10, 20), each current conductor being arranged so as to electrically link an upstream connection land (11, 21) to a downstream connection land (15, 25), respectively; - at least two current sensors (51, 52), each current sensor being positioned around a respective current conductor (10, 20) so as to form a respective passage (51A, 52A) for the current conductor along an axis oriented in a first direction in the upstream face -downstream face direction; and - a differential current sensor positioned around the set of the at least two current conductors (10, 20) so as to form a common passage for the current conductors (10, 20) along an axis oriented in a second direction in the front face -back face direction, each upstream connection land (11, 21) being aligned along an axis that is oriented in the first direction with each respective downstream connection land (15, 25) to which said upstream connection land (11, 21) is linked by a respective current conductor (10, 20); said current measurement device being characterized in that it is intended to measure the currents flowing through three phase lines and one neutral line of a three-phase electrical network, and in that it includes a first, a second and a third current sensor (51, 52, 53), each current sensor being intended to measure a current flowing through each of the phases, and includes a fourth current sensor that is intended to measure a current in the neutral line, the fourth current sensor being positioned around a neutral conductor so as to form a passage for the current conductor along an axis oriented in a third direction in a first lateral face -second lateral face direction. - at least two upstream connection lands (11, 21), which lands are intended to be electrically connected to connection lands (17, 27) of an electric current breaking device for protecting at least two electrical lines (19, 29); - at least two downstream connection lands (15, 25), which lands are intended to be electrically connected to operating terminals (16, 26); - at least two current conductors (10, 20), each current conductor being arranged so as to electrically link an upstream connection land (11, 21) to a downstream connection land (15, 25), respectively; - at least two current sensors (51, 52), each current sensor being positioned around a respective current conductor (10, 20) so as to form a respective passage (51A, 52A) for the current conductor along an axis oriented in a first direction in the upstream face -downstream face direction; and - a differential current sensor positioned around the set of the at least two current conductors (10, 20) so as to form a common passage for the current conductors (10, 20) along an axis oriented in a second direction in the front face -back face direction, each upstream connection land (11, 21) being aligned along an axis that is oriented in the first direction with each respective downstream connection land (15, 25) to which said upstream connection land (11, 21) is linked by a respective current conductor (10, 20); said current measurement device being characterized in that it is intended to measure the currents flowing through three phase lines and one neutral line of a three-phase electrical network, and in that it includes a first, a second and a third current sensor (51, 52, 53), each current sensor being intended to measure a current flowing through each of the phases, and includes a fourth current sensor that is intended to measure a current in the neutral line, the fourth current sensor being positioned around a neutral conductor so as to form a passage for the current conductor along an axis oriented in a third direction in a first lateral face -second lateral face direction.