Chauvin Arnoux C173 [P01120309] 1 mA - 1200 A AC Current Clamp Adapter. These clamp transformers have been specially developed for the search and measurement of residual currents at low-voltage systems, without any interruption of business. They are particularly recommended for preventive maintenance of industrial plants with high availability, as business interruption and major damage caused by insulation faults can be avoided at an early stage. They are suitable for all types of electrical systems: Single-phase systems, three-phase systems in 3- or 4-wire technology, symmetrically or asymmetrically loaded, with neutral conductor on earth or not. The C173 clamp measures leakage or differential currents from 1 mA upwards and can also be used with multimeters equipped with a range in mV AC. The C173 clamp measures earth-loop currents and leakage currents. It  also locates faults in circuits of single and three-phase networks. For unearthed three-phase systems, use the optional Artifi cial Neutral.