Nanocrystalline toroidal core 40×30×15 mm
40×30×15 mm nanocrystalline toroidal core, Blue colored Powder Coating.
CCNT-040-030-015-LFBL is a 40×30×15 mm nanocrystalline toroidal core with Blue powder coating. Bare size is 40×30×15 mm. Finished (coated) size is 41.1×29.3×15.2 mm.
In stock
$11.70Pack of 5
$2.34 per piece
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Volume pricing
Online packs are $10.00 minimum. Buy packs totaling under 50 pieces. 50+ is quoted.
| Pack / qty | Unit price | How to buy |
|---|---|---|
| Pack of 5 | $2.34 | Buy online |
| Pack of 10 | $1.87 | Buy online |
| 50+ pieces | Quoted | Request quote |
Technical Specifications
Bare core dimensions
Cased / finished dimensions
Magnetic properties
AL is one turn through the window (Kelvin clips) at 0.3 V. It is not a 2 mT small-signal AL. At 1 kHz this drive saturates the smaller cores.
Finish and handling
Environmental
Product photos
Applications and selection
Recommended usage
- current transformers
- ground-fault sensing
- prototype magnetics
DIY & R&D usage
- DIY current-sensing builds
- benchtop transformer prototyping
- hobbyist magnetics experiments
Technical applications
- current transformers (powder-coated LF toroid)
- ground-fault sensing (powder-coated LF toroid)
- prototype magnetics (powder-coated LF toroid)
When to choose this size
Choose CCNT-040-030-015-LFBL when you need this 40×30×15 mm powder-coated toroid. Use the bare dimensions for the magnetic path and the finished inner diameter (29.3 mm) for winding clearance.
Winding notes
Magnetic calculations should use the bare 40×30×15 mm geometry (Ae 0.62 cm², Le 11 cm, stacking factor 0.82). AL is one turn through the window (Kelvin clips) at 0.3 V: 20 µH at 1 kHz, 17 µH at 10 kHz, and 3 µH at 100 kHz. This is not a 2 mT small-signal AL. At 1 kHz this drive saturates the smaller cores. Size the winding to the finished ID 29.3 mm, not the 30 mm bare ID. Saturation is 1.25 T. Core continuous temperature is -40°C to +150°C. Powder-coat temperature class is not published.
Related application guides
Frequently asked questions
Are the stated dimensions bare or finished?
The size in the product name is the bare core (40×30×15 mm). Finished coated size is 41.1×29.3×15.2 mm.
How was AL measured?
One turn: Kelvin clips through the window at 0.3 V. AL is 20 µH at 1 kHz, 17 µH at 10 kHz, and 3 µH at 100 kHz. This is not a 2 mT small-signal AL. At 1 kHz this drive saturates the smaller cores. Verify inductance on the wound part.
Where is a core this size used?
This 40×30×15 mm powder-coated toroid is a wider-window current transformer core for ground-fault and residual-current sensing. The 29.3 mm finished opening lets a cable pass through while the secondary senses current, which is a common layout in protection and metering assemblies.
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