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To measure energy consumption for the application in buildings and industry, operating with aux supply 100-230 VAC/DC, using LED screen to display and equipped with Modbus RTU communication during 10 years. This function is ensured in accordance with the following technical parameter for the product: Auxiliary Power Supply  Type: Single-phase  Voltage: 100-230 V AC/DC±15%  Frequency: 50-60 Hz  Power consumption: 5VA max  Installation category: CAT III 300V class per IEC 61010-1 edition 3  Protection fuse: T1 A-277 V AC Voltage Measurement Input  Voltage Range: 80-300 V AC (L-N)  Type: Single-phase, three-phase (3P, 3P+N)  Rated frenquency: 50 Hz or 60 Hz  Protection fuse: T1 A-277 V AC Current Measurement Input  Current input mode: Indirect insertion with CT  Rated current at secondary side of transformer: 1A or 5A  Range without accuracy derating: 500mA-6A