Method for the detection of current interruption which is characterized in that it a) can be applied to a switched electrified point that is supplied by a phase conductor (L; 2) and a neutral conductor (N; 1), without a third conductor of permanent current supply, b) creates a new switched connection point controlled by a relay, which leads to an AC load connection and c) charges a rechargeable battery using a rectifying circuit that bypasses switch, and which discerns whether: - a general electrification interruption occurred, in particular caused by the provider or due to a distribution board failure, or - an electrification interruption occurred intentionally by the user via the switch, or - an electrification interruption has not occurred, and executes, with the help of a Microcontroller, the following steps: 1) a PWM converter, i.e. pulse width modulation converter, converts the AC voltage to digital time information in accordance with the network alternating voltage waveform V(t)=Vpk*sin(ωt), 2) the microcontroller measures the time of a half period (t) and a period, calculates their ratio t/T and concludes: 3) if a total lack of the sine wave is detected, then there is a general current failure, in which case charging of the rechargeable battery and supply to the AC load is discontinued, while external loads are supplied by the rechargeable battery, 4) if a positive, 0 < ωt < π, or negative, π < ωt < 2π, half sine period is detected, then there is no general failure, but switch has been intentionally opened by the user and the half sine period current flow is due to a rectification circuit which bypasses switch, in which case electrification to the AC load is interrupted in accordance to the user's command, and the rechargeable battery continues its charging via power supply unit, 5) whereas if no half sine period is detected while electrification exists, then a whole sine period exists 0< ωt <2π and the switch has been intentionally closed by the user, so that the current flow during the whole sine wave period is due to the closed switch, which bypasses the rectification circuit, and electrification of AC load continues in accordance with the user's command, and charging of rechargeable battery continues via power supply unit. a) can be applied to a switched electrified point that is supplied by a phase conductor (L; 2) and a neutral conductor (N; 1), without a third conductor of permanent current supply, b) creates a new switched connection point controlled by a relay, which leads to an AC load connection and c) charges a rechargeable battery using a rectifying circuit that bypasses switch, and which discerns whether: - a general electrification interruption occurred, in particular caused by the provider or due to a distribution board failure, or - an electrification interruption occurred intentionally by the user via the switch, or - an electrification interruption has not occurred, - a general electrification interruption occurred, in particular caused by the provider or due to a distribution board failure, or - an electrification interruption occurred intentionally by the user via the switch, or - an electrification interruption has not occurred, 1) a PWM converter, i.e. pulse width modulation converter, converts the AC voltage to digital time information in accordance with the network alternating voltage waveform V(t)=Vpk*sin(ωt), 2) the microcontroller measures the time of a half period (t) and a period, calculates their ratio t/T and concludes: 3) if a total lack of the sine wave is detected, then there is a general current failure, in which case charging of the rechargeable battery and supply to the AC load is discontinued, while external loads are supplied by the rechargeable battery, 4) if a positive, 0 < ωt < π, or negative, π < ωt < 2π, half sine period is detected, then there is no general failure, but switch has been intentionally opened by the user and the half sine period current flow is due to a rectification circuit which bypasses switch, in which case electrification to the AC load is interrupted in accordance to the user's command, and the rechargeable battery continues its charging via power supply unit, 5) whereas if no half sine period is detected while electrification exists, then a whole sine period exists 0< ωt <2π and the switch has been intentionally closed by the user, so that the current flow during the whole sine wave period is due to the closed switch, which bypasses the rectification circuit, and electrification of AC load continues in accordance with the user's command, and charging of rechargeable battery continues via power supply unit.