A measuring device (10) comprising a current sensor (20) and a measuring unit (40) connected to each other by a connection cable (50). The connection cable (50) comprises three pairs of conductors of which a first measurement pair (51) is arranged to transmit a signal representative of the current measured by the sensor (20), a second power supply pair (52) is arranged to power electrically the sensor (20) and the measuring unit (40), and a third communication pair (53) is arranged to transmit at least one complementary signal between the sensor (20) and the measuring unit (40), such as an identification feature of the sensor allows the measuring unit to recognize automatically the sensor and provide an exploitable correlated value of the current measured by the sensor (20).