... power, power factor, energy in three circuits, with 3DI+1DO. YD2080-2Three-phase voltage, frequency in one circuit, each phase current ... power, power factor, energy in two circuits, with 3DI+1DO. YD2080-4hree-phase voltage, frequency in one circuit, each phase current ... power, power factor, energy in four circuits, with 3DI+1DO. YD2080-KThree-phase voltage, frequency in one circuit, each phase current ...