The compact SCT3xxx 3-phase ring-type CTs for direct mounting under commonly used power switches measure primary currents from 0…3 x 50 A AC to 0…3 x 600 A AC, with secondary currents of 1 or 5 A. The whole of the SCT3xxx series is available in accuracy class 1 and is supplemented by the SCT3121-0125 and SCT3121-0150 CTs in accuracy class 0.5.
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