RCDs sense very small differential currents, so the core needs high µi and low coercivity. Nanocrystalline toroids are preferred; they keep the trip point stable from −25 °C to +85 °C and are usually epoxy coated for winding.
OD 10–40 mm, ID/height per design, coating 0.2–0.3 mm. Tell us trip current and standard (IEC 61008/61009).
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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NC-WELDERCores for 10–50 kHz inverter welder main transformers — a drop-in upgrade over MnZn ferrite with smaller size and lower temperature rise.
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