A meter (1; 101) arranged to measure electrical energy delivered to an installation (2; 102) by a distribution network (3; 103) comprising a phase line and a neutral line, the meter being arranged to be connected to a circuit breaker (6; 106) situated outside the meter and downstream therefrom, the meter comprising: · a phase conductor (10; 110_i) and a neutral conductor (11; 111) arranged to be connected respectively to the phase line and to the neutral line of the distribution network; · a cut-off member (12; 112) connected in the phase conductor; · a detection circuit comprising: ∘ an injection chain (15; 115) comprising at least one generator component and an injection component, the at least one generator component being arranged, while the cut-off member is open, to generate a test signal (St) with a predetermined voltage level, the injection component being arranged to inject the test signal into the phase conductor downstream from the cut-off member; ∘ a measurement chain (16; 116) arranged to measure an intermediate voltage level of the test signal at a measurement point (Pm) of the injection chain, which point is situated between the at least one generator component and the injection component; ∘ a processor component (17; 117) arranged to act as a function of the intermediate voltage level in order to determine whether the circuit breaker is open or closed. · a phase conductor (10; 110_i) and a neutral conductor (11; 111) arranged to be connected respectively to the phase line and to the neutral line of the distribution network; · a cut-off member (12; 112) connected in the phase conductor; · a detection circuit comprising: ∘ an injection chain (15; 115) comprising at least one generator component and an injection component, the at least one generator component being arranged, while the cut-off member is open, to generate a test signal (St) with a predetermined voltage level, the injection component being arranged to inject the test signal into the phase conductor downstream from the cut-off member; ∘ a measurement chain (16; 116) arranged to measure an intermediate voltage level of the test signal at a measurement point (Pm) of the injection chain, which point is situated between the at least one generator component and the injection component; ∘ a processor component (17; 117) arranged to act as a function of the intermediate voltage level in order to determine whether the circuit breaker is open or closed. ∘ an injection chain (15; 115) comprising at least one generator component and an injection component, the at least one generator component being arranged, while the cut-off member is open, to generate a test signal (St) with a predetermined voltage level, the injection component being arranged to inject the test signal into the phase conductor downstream from the cut-off member; ∘ a measurement chain (16; 116) arranged to measure an intermediate voltage level of the test signal at a measurement point (Pm) of the injection chain, which point is situated between the at least one generator component and the injection component; ∘ a processor component (17; 117) arranged to act as a function of the intermediate voltage level in order to determine whether the circuit breaker is open or closed.