ETCR7300 series large caliber three phase clamp power meter is used for measuring three phase AC voltage, current, leakage current, phase between voltage , phase between current, frequency, phase sequence, electrical energy, active power, reactive power, apparent power, power factor, total power, etc multifunction, digital and intellgence meter. clamp large caliber(80mm*80mm, can clamp φ80mm cable, or 96mm×4mm flat steel grounding wire), very convenient to use. Fully compatible the function of large caliber clamp leakage current meter and micro power clamp meter, also can be used to distinguish transformer connection group, sensibility, capacitive circuit, read the phase relationship between each groups CT differential protection, check watt hour meter wiring correctly or not, maintenance line equipment, etc., for electricity inspection personnel to provide a safe, accurate and convenient new power meter.