Ground-Fault / RCD / GFCI Core Kit
Large-window nanocrystalline toroids for ground-fault, RCD, and GFCI sensing. Extra quantity of the 40×32 mm large-ID core plus mid and high current sizes for pass-through experiments.
Kit price
Compare-at is the sum of 1-pc list prices ($13.45 kit savings vs buying singles).
In stock for online purchase
Set quantity with +/-, then add to cart. Use the cart icon in the header to review items before checkout.
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What's in the box
Fourteen nanocrystalline PBT-cased toroidal cores focused on residual-current and ground-fault windows.
| Qty | SKU | Description | Dimensions | 1-pc list |
|---|---|---|---|---|
| 2 | CCNT-025-016-010-MFBL | Nanocrystalline toroidal core 25×16×10 mm | 25×16×10 mm | $4.50 |
| 2 | CCNT-030-020-010-MFBL | Nanocrystalline toroidal core 30×20×10 mm | 30×20×10 mm | $5.76 |
| 2 | CCNT-030-020-015-MFBL | Nanocrystalline toroidal core 30×20×15 mm | 30×20×15 mm | $8.10 |
| 4 | CCNT-040-032-015-MFBL | Nanocrystalline toroidal core 40×32×15 mm | 40×32×15 mm | $9.90 |
| 2 | CCNT-045-030-015-HFBK | Nanocrystalline toroidal core 45×30×15 mm | 45×30×15 mm | $15.66 |
| 2 | CCNT-050-032-015-MFBL | Nanocrystalline toroidal core 50×32×15 mm | 50×32×15 mm | $27.90 |
Who it's for
- GFCI and RCD design engineers
- EV charger leakage-current teams
- Residual-current monitoring labs
Typical use cases
- GFCI/RCD sensor core size selection
- Leakage and residual-current transformer trials
- EV charger ground-fault sensing prototypes
- Cable pass-through current sensing
How to use
Use the 40×32 mm core when cable clearance matters most. Compare against 30 mm and 50 mm neighbors for magnetizing inductance, phase error, and mechanical fit. Reorder the winning SKU when the design freezes.
FAQ
Why does this kit include extra 40×32 mm cores?
The 40×32 mm large-ID geometry is the workhorse for many GFCI/RCD pass-through designs, so the kit includes four pieces for winding and repeatability checks.
What happens after I pick a winning size?
Reorder that single catalog SKU in pack quantities (or request a production-gapped cut core). Kits are for size and gap exploration, not a substitute for locking a production part number.
Do kits ship with datasheets?
Each included SKU has its own product page with dimensions, AL, and photos. Open the linked part numbers in the contents table for datasheets and specs.
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Ready for production volumes after you lock a size? Request a quote for that SKU or browse pack pricing on each product page.