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This device is a flush-mount energy meter with a 96mm by 96mm backlit LCD display. The meter provides Class 0.5S accuracy per IEC 62053-22 standard and 64 samples per cycle. The meter will measure Energy, Active and Reactive Power, Voltage, Current, Frequency, Power Factor and up to the 31st Harmonic. Include 256 kiloBytes of memory for two fixed parameters, active and reactive energy. The meter will function in a 50Hz or 60Hz network and accepts supply voltage ranging from 100 to 415 VAC and 125 to 250 VDC. Line rated current for this meter is 1A or 5A input and will support Single Phase and Neutral, Three Phase, or Three Phase and Neutral configurations. The range of measurement voltage between Phases is 35 to 690 VAC at 47 to 63 Hz. Measurement range between Phase and Neutral is 20 to 400VAC at 47 to 63 Hz. Communication protocol is Modbus RTU and ASCII 2 wires with RS485 port support. The meter also has two digital inputs or digital outputs, configurable. There are 35 configurable alarms and it supports four tariff schedules. Product dimensions are as follows: width 3.78 inches (96 millimetres), depth 2.83 inches (72 millimetres), height 3.78 inches (96 millimetres) and product weight 15.2 onces (430 g).