What's the difference of the tripping curves, B, C, and D?

B curve, the tripping current is 3-5In,it mainly protects for people and big length cables in TN and IT; C curve, the tripping current is 5-10In, it mainly protects for resistive and inductive loads with low inrush current; D curve, the tripping current is 10-20In,it protects for circuit which supply loads with high inrush current at the circuit closing, such as LV transformaers, breakdown lamps.

What's the meaning of the energy limiting class 3 under the mark of 6000 or 10000 breaking capacity?

The energy limit class is the Joule integral of circuit breaker when breaking large current, the energy limit class is devided into 3 classes, class 3 the highest. the higher is the energy limit class, the better is the performance of the breaker tripping capacity.

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Intelligent Reactive Power Compensation Controller

Intelligent reactive power compensation controller work automatically with low voltage capacitor to improve power factor. It controls the automatic switching of shunt capacitors, improves the voltage quality and reduces the power loss.