Only calibrated meters are permitted for electricity billing according to §25 of the German Calibration Act. Non-compliance is an administrative offense under §19. M-Bus three-phase meter. Maximum current 3x80A, standby loss only 0.5 watts per path. Rail-mounted device for installation on DIN-EN 60715 TH35 mounting rails. 4 division units = 70 mm wide, 58 mm deep. Accuracy class B (1%). With M-Bus interface. The directly measuring three-phase meter measures active energy based on the currents flowing between the inputs and outputs. The self-consumption of only a maximum of 0.5 watts active power per path is not measured and not displayed. 1, 2, or 3 external conductors with currents up to 80 A can be connected. The starting current is 40 mA. The neutral connection must be present. The 7-segment LC display can also be read twice within two weeks without power supply. Power consumption is indicated by a blinking LED that flashes 1000 times per kWh. It can also be used as a two-tariff meter as standard.