The device for measuring values in metric units (kWh) is designed for direct measurement of active power in a single-phase system and for recording consumed electricity, with the capability to remotely read the index group registers via a wired RS485 network. Protocol: Modbus-RTU type and 4 independent tariffs (the user can set different times via the RS485 port). A special electronics system, powered by current and applied voltage, generates pulses proportional to the consumed electricity. The power consumption of the phase is indicated by a blinking LED. The number of pulses is converted into energy consumption, and its value is displayed on the LCD screen (5 + 1). Real-time clock lithium battery, accuracy 0.5 sec/day. Power supply: 230V ~, 50Hz, base current: 5A, max. current: 100A, min. current: 0.25A, pulse frequency: 1000 pulses/kWh, accuracy class B, housing one TE wide, mounting on TH-35 mm DIN rail. Energy measurement must be carried out in accordance with the MID directive 2014/32/EU standards EN50470-1:2006, EN50470-3:2006.