Size marking on the case is the bare core dimension (OD × ID × H), not the cased or finished size.
Nanocrystalline toroidal core 50×32×15 mm
50×32×15 mm nanocrystalline toroidal core, Blue PBT Class B 130C.
CCNT-050-032-015-MFBL is a 50×32×15 mm nanocrystalline toroidal core for high-current metering CTs, medium-frequency transformers, and protective relay CTs. Its 32 mm inner diameter supports practical secondary windings, while high-permeability nanocrystalline material helps achieve useful magnetizing inductance at low turns. Choose this size when winding window, magnetic area, and envelope must stay in balance for the target current or VA.
Technical Specifications
Bare core dimensions
Cased / finished dimensions
Magnetic properties
Finish and handling
Environmental
Applications and selection
Applications
- high-current metering CTs
- medium-frequency transformers
- protective relay CTs
- ground-fault sensing
- high-current revenue-grade metering CTs
- medium-frequency isolation power transformers
- protection-class current transformers
- ground-fault/residual-current sensing cores
When to choose this size
This 50×32×15 mm toroidal core is sized for high-current metering CTs and related designs in the nearby size family. Step down to the 40×32×15 mm core when board space, enclosure height, or a tighter footprint matters more than winding room. This is among the larger options in the family: pick it when cable clearance, high current, or maximum magnetic area come first. In short, pick CCNT-050-032-015-MFBL when your design for high-current metering CTs fits this window and OD; pick a neighbor when compactness or power handling shifts the trade-off.
Winding notes
Magnetic calculations should use the bare 50×32×15 mm geometry (Ae 1.1 cm², Le 12.87 cm). The winding must fit the finished window: cased ID is 28.9 mm, not the 32 mm bare ID. Keep the winding distributed around the toroid to limit leakage and local heating. High permeability (μi 80,000) supports useful magnetizing inductance at practical turn counts; stay within 1.25 Tesla saturation and the -40°C to +130°C PBT Class B 130C limit.
Related application guides
Frequently asked questions
Are stated dimensions bare or cased?
The 50×32×15 mm size marked on the case is the bare core (OD × ID × H). Finished cased size is 53.9 × 28.9 × 18.7 mm. Use bare dimensions with Ae and Le for magnetic design, and the finished inner diameter for winding clearance.
Is this core suitable for a current transformer?
Yes. It is a nanocrystalline core sized for high-current metering CTs, including high-current revenue-grade metering CTs. High permeability helps you reach useful secondary inductance with practical turns in a 50 mm OD.
When should I choose a different size instead?
Stay with this size when clearance and magnetic area come first. Step down to the 40×32×15 mm core only when a smaller footprint is required and the winding still fits.
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