This part is a kind of semiconductor called BL6511.

Function of this product has Three-phase Active Energy Meter.

Manufacturers : SHANGHAI BELLING

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Some of the text within the PDF file :

Three-phase Active BL0952A/BL6513/BL6511 Energy Meter FEATURES High accuracy, less than 0.1% error over a dynamic range of 500:1 High stability during calibration, the fluctuation of output CF is less than 0.1%. Low drift, the gain variety is less than 0.1% when input frequency changes from 45Hz to 65Hz Single 5V Supply, Static Power 25mW(typical), Power solution only with Resistor & Capacitor can be adopted. The Low Frequency Output (F1, F2) can drive motor directly; The High Frequency Output (CF) can be used in calibration and data processing. Selectable between the arithmetic sum of the three-phase active energies and the absolute value sum of these energies. Measure positive active power and negative active power. Anti-Fault, the Logic Output REVP indicates a Potential Miswiring or Ne [ ... ]

BL6511 PDF Datasheet Download