... the three-phase active power meter is a rail-type advanced microelectronic technology and SMT ... . The three-phase active power meter with IR and RS-485 port communication function, using ... of measuring residential electricity billing meters, also has a measurement of high precision, high sensitivity, reliable ... (6) A, 3 × 5 (20) A, 3 × 10 (40) A, 3 × 15 (60) A, 3 × 20 (80) A, 3 × 30 (100 ) A2, ...