Process for manufacturing a circuit breaker comprising manufacturing a measuring sensor for said circuit breaker, said process for manufacturing the measuring sensor comprising the following successive steps: A step of providing a current-measuring unit comprising a torus able to be passed through by a primary conductor (R, S, T, N) and comprising a first conductor wound around the torus, a current transformer able to be passed through by the primary conductor (R, S, T, N), a voltage-measuring unit able to be connected to the primary conductor (R, S, T, N) in order to measure a potential appearing in the primary conductor (R, S, T, N), and a data-managing unit comprising a nonvolatile memory; A step of characterizing the measuring sensor consisting in determining the phase shift of an electrical signal induced in the first conductor with respect to an electrical signal induced in the primary conductor (R, S, T, N) and of an electrical signal induced in the voltage-measuring unit with respect to an electrical signal induced in the primary conductor (R, S, T, N), in determining a current gain of the electrical signal induced in the first conductor with respect to the electrical signal induced in the primary conductor (R, S, T, N) and in determining a voltage gain of the electrical signal induced in the voltage-measuring unit with respect to the electrical signal induced in the primary conductor (R, S, T, N); A step of parameterizing the data-managing unit, consisting in recording a datum representative of the phase shift, a datum representative of the current gain and a datum representative of the voltage gain determined in the step of characterizing the measuring sensor, in the nonvolatile memory, said process for manufacturing a circuit breaker being characterized in that it further comprises the following successive steps: A step of providing an actuator comprising a controlling unit; A step of pairing the data-managing unit with the controlling unit, consisting in electrically connecting the data-managing unit to the controlling unit so that the controlling unit is able to retrieve the datum representative of the phase shift and/or the datum representative of the current gain and/or the datum representative of the voltage gain of the nonvolatile memory of the data-managing unit. A step of providing a current-measuring unit comprising a torus able to be passed through by a primary conductor (R, S, T, N) and comprising a first conductor wound around the torus, a current transformer able to be passed through by the primary conductor (R, S, T, N), a voltage-measuring unit able to be connected to the primary conductor (R, S, T, N) in order to measure a potential appearing in the primary conductor (R, S, T, N), and a data-managing unit comprising a nonvolatile memory; A step of characterizing the measuring sensor consisting in determining the phase shift of an electrical signal induced in the first conductor with respect to an electrical signal induced in the primary conductor (R, S, T, N) and of an electrical signal induced in the voltage-measuring unit with respect to an electrical signal induced in the primary conductor (R, S, T, N), in determining a current gain of the electrical signal induced in the first conductor with respect to the electrical signal induced in the primary conductor (R, S, T, N) and in determining a voltage gain of the electrical signal induced in the voltage-measuring unit with respect to the electrical signal induced in the primary conductor (R, S, T, N); A step of parameterizing the data-managing unit, consisting in recording a datum representative of the phase shift, a datum representative of the current gain and a datum representative of the voltage gain determined in the step of characterizing the measuring sensor, in the nonvolatile memory, said process for manufacturing a circuit breaker being characterized in that it further comprises the following successive steps: A step of providing an actuator comprising a controlling unit; A step of pairing the data-managing unit with the controlling unit, consisting in electrically connecting the data-managing unit to the controlling unit so that the controlling unit is able to retrieve the datum representative of the phase shift and/or the datum representative of the current gain and/or the datum representative of the voltage gain of the nonvolatile memory of the data-managing unit. A step of providing an actuator comprising a controlling unit; A step of pairing the data-managing unit with the controlling unit, consisting in electrically connecting the data-managing unit to the controlling unit so that the controlling unit is able to retrieve the datum representative of the phase shift and/or the datum representative of the current gain and/or the datum representative of the voltage gain of the nonvolatile memory of the data-managing unit.