Flexible Rogowski coil current sensors with patented Perfect Loop Technology for minimal positioning error and cross-talk immunity. Both series provide galvanic separation, near-perfect linearity, no saturation, and no upper current limit; an electronic integrator is required to convert the derivative output to a current-proportional signal. Rated 1kV CAT III.

ART (indoor, IP57): 6.1mm gauge, Ø35–300mm aperture, 22.5 mV/kA @ 50Hz output; 3-in-1 three-phase variant available. ARU (outdoor, IP68): 10.4mm gauge, Ø70–300mm aperture, 100 mV/kA @ 50Hz output; UV, water, dust, and ice resistant with Twist and Click closure.

Applications span secondary substations, distribution transformer monitoring, PMUs, building metering, overhead lines, and fault detection.