Abstract: A system (10) for power and/or energy consumption metering on an AC powerline network (1) supplying a plurality of channels (C1, C2, . . . , Cn) with a respective electrical load (L1, L2, . . . , Ln), comprising: A central unit (11) connected to the AC powerline network (1), comprising a single central voltmeter (110) supplied by a power supply unit (112); A plurality of clamped-on units (12), distributed over each channel (C1, C2, . . . , Cn) to be measured, each clamped-on unit (12) being clipped around existing cables, and comprising a current transformer (120) in order to measure current values The plurality of clamped-on units (12) are connected to the central unit (11) for data transmission and synchronization, and for power supply by the power supply unit (112).

Abstract: A hybrid relay (1) comprises an electromechanical part (10) with a movable contact (103), a solid state relay (11) and a control unit (2) for applying a drive signal (S?,S?) to the drivable coil (101) of the electromechanical part. A method for operating the hybrid relay comprises steps of determining a first minimum voltage (V1) for the drive signal above which the movable contact (103) starts to move away from an open position (Po) and a second minimum voltage (V2) for the drive signal above which the movable contact (103) reaches the closed position (Pc), and a step of shaping a waveform (W) for the drive signal comprising a portion (W1) consisting of a vertical segment jumping from zero to the first minimum voltage value, a portion (W2) wherein the voltage gradually increases from the first minimum value to the second minimum voltage value, and a portion (W3) consisting of another vertical segment jumping from the second minimum voltage value to an upper voltage boundary (Vsup).