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5430/5431 -M-Ex three phase static energy meter is designed by using special large-scale integrated circuit (IC) and SMT technology. The 5430/5431 are widely used in measuring s A.C. energy power. It conforms to the requirements specified in CEI IEC62052-11-2003 Electricity metering equipment (a.c.) General requirements, tests and test conditions Part 11: Metering equipment,CEI IEC62053-21-2003 Electricity metering equipment (a.c.) Particular requirements Part 21: Static meters for active energy (classes 1 and 2) Equipmen and DL/T645-1997 Multi-function Communication Protocol.