Single and three-phase meters use small nanocrystalline or silicon steel toroids as current sensors. Consistency matters more than absolute permeability: tight dimensional tolerance and stable annealing keep meter-to-meter error small.
Accuracy class, rated current, OD/ID/height, coating, and whether automated winding requires taped edges.
OD-CoreGrain-oriented silicon steel toroidal cores for instrument transformers, power transformers and reactors.
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NC-METER1K107 Fe-based nanocrystalline cores for built-in current transformers in smart single- and three-phase meters, meeting class 0.1 / 0.05 accuracy.
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NC-RCDClosed-ring nanocrystalline cores for AC / A / B type residual current detection, sensitive down to 10 mA leakage.
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