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Product

IEC 61788-26 REBCO HTS Roebel cableIEC 61788-26 REBCO 2G HTSFully Transposed Roebel BarLow AC Loss · 4.2 K to 77 K

HTS Roebel Cable Transposed REBCO High-TemperatureFully transposed meander-punched REBCO 2G HTS rectangular Roebel cable (4.2 K–77 K)

Fully transposed High-Temperature Superconducting Roebel Cable (HTS Roebel Cable) built to IEC 61788-26 by precision-punching 12 mm REBCO 2G HTS coated-conductor tapes into meander-shaped strands (2 mm or 5.5 mm wide) and cabling 10 to 30 strands into a.

Low-EMC design
EMC screen
Water-resistant
Approved
Order designation
ROEBEL-15/5-12mm
Bar width
12.0 mm
I_c (4.2K, 13T)
14.5 kA
I_c (77K, 0T)
2.80 kA
Pitch L_p
300 mm
All sizes (6)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Superconductor
2G HTS REBCO
meander-punched 12 mm tapes
Strand count
10 to 30 strands
fully transposed in 2 stacks
Bar profile
12×1.0–2.9 mm
or 4×0.9–1.3 mm compact bar
Critical cur.
9.5 to 28 kA
at 4.2 K, 13 T (1.8–5.4 kA @77K)
Transposition
126 to 300 mm
precision meander pitch length
Temp. window
4.2 K to 77 K
LHe (4.2K), LH₂/GHe (20K), LN₂

Typical values for this cable type, based on IEC 61788-26 / CERN EuCARD-2 / IEEE 1726 — confirmed in the datasheet and quotation for your order.

Application fit

Is HTS Roebel Cable right for your machine?

Eliminates the severe 50/60 Hz AC magnetisation and circulating-current losses of parallel stacked REBCO tapes while preserving a flat rectangular cross-section for high-packing-density utility transformer windings, high-speed superconducting motors/generators and 15–20 T cos-theta / block-coil accelerator dipoles.

Fixed installation

Suitable

Wound into flat pancake or layer coils for 50/60 Hz HTS power transformers, fault-current limiters and 20 T dipole magnets.

Immersion & wet locations

Suitable

Operates immersed in subcooled liquid nitrogen (65–77 K), liquid neon/helium gas (20–30 K) or liquid helium (4.2 K).

VFD inverter to AC motor screened feeder

Suitable

Full strand transposition reduces AC transport and perpendicular-field hysteresis losses by 60–80 % in kHz aircraft/marine stator.

Typical machinesUtility 50/60 Hz HTS Power Transformers (65–77 K)MW-Class Cryogenic Aircraft & Marine Propulsion MotorsHigh-Energy Physics Accelerator Cos-θ & Block DipolesInductive Superconducting Fault Current Limiters (SFCL)

Construction

Layer by layer

Shown: ROEBEL-15/5-12mm (12.0 × 1.5 mm rectangular bar) with 15 meander-punched REBCO 2G HTS strands (5.5 mm strand width, 300 mm transposition pitch, 50 µm Hastelloy C-276 substrate + 20 µm Cu surround), inter-strand polyimide/epoxy insulation and S-glass/polyimide turn wrap.

123
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Meander-punched REBCO 2G HTS coated-conductor strands10 to 30 strands rotary-die punched from 12 mm (or 4 mm) REBCO tape (Hastelloy C-276Every strand visits all four quadrants of the rectangular cross-section once per transposition pitch (126–300
2Inter-strand turn insulation (optional insulatedThin 12–25 µm polyimide coat or controlled oxide inter-strand contact layerPrevents inter-strand eddy currents in 50/60 Hz AC transformer windings while allowing current sharing in
3Outer turn-to-turn cryogenic insulation wrap50 %-overlapped polyimide tape (2×25 µm) or VPI-impregnated S2-glass/epoxy braidProvides 3–15 kV turn-to-turn dielectric withstand in LN₂ or LHe and supports 150 MPa transverse Lorentz load

12 mm High-Current Magnet & Transformer Roebel (5.5 mm Strands)

10 to 30 strands of 5.5 mm width for 1.8–5.4 kA (77 K) or 9.5–28 kA (4.2 K, 13 T)

4 mm Compact Stator/Coil Roebel (2.0 mm Strands)

Ultra-low AC loss 4 mm wide bar with 2 mm strands for high-frequency rotating machine stators

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61788-26 / CERN EuCARD-2 / IEEE 1726. Values for your order are confirmed in the datasheet and quotation.

Electrical

Critical current (I_c @ 77 K
450 A (10/2-4mm) to 5,400 A (30/5-12mm) in liquid nitrogen
Critical current (I_c @ 4.2 K, 13 T B ⊥
2,200 A (10/2-4mm) to 28,000 A (30/5-12mm) in liquid helium
Engineering current density (J_e @ 4.2
650 to 900 A/mm² across the compact rectangular bar cross-section
50/60 Hz AC loss reduction vs. stacked
60 % to 80 % lower AC magnetisation & transport loss via full

Thermal

Operating cryogenic temperature range
4.2 K (LHe) · 20–30 K (GHe/LH₂/LNe) · 65–77 K (subcooled LN₂)
Thermal cycling & overload stability
Verified thermal ageing and short-circuit withstand per standard

Mechanical

Transposition pitch length
126 mm, 180 mm, 226 mm or 300 mm (customisable to coil turn circumference)
Minimum flatwise / easy-way bend radius
15 to 25 mm (unimpregnated) · Transverse stress limit ≥ 150 MPa (epoxy VPI)

Resistance

Punch-edge seal & moisture protection
Optional post-punching Ag/Cu or SnPb edge coating + polyimide encapsulation
Environmental & chemical durability
Resistant to moisture, industrial fluids and service ageing

Reference standards

Governing HTS standards
IEC 61788-26 (REBCO critical current), IEC 61788-8 (AC loss) & EuCARD-2
Factory QA & material compliance
EN 10204 3.1 routine test certificate · RoHS 2 & REACH compliant

Identification

Spool delivery & quality mapping
Continuous 50–300 m lengths with strand-by-strand Tapestar I_c map
Customs tariff (HS)
8544.49 / 8505.90

Sizes

6 standard transposed REBCO 2G HTS Roebel cable configurations

4 mm and 12 mm rectangular Roebel bars for 50/60 Hz AC transformers, motors and 4.2 K magnets.

Strand architecture, dimensions & critical current
Order designationStrand count & widthBar W × TWidth
mm		I_c (4.2K, 13T)
kA		I_c (77K, 0T)
kA		Pitch L_p
mm		Enquiry
4 mm Narrow Low-AC-Loss Roebel Bars (2 mm Strands · Stators & Transformers)
ROEBEL-10/2-4mm10 strands · 2 mm strand width4.0×0.9 mm Bar4.02.20.45126
ROEBEL-15/2-4mm15 strands · 2 mm strand width4.0×1.3 mm Bar4.03.30.68126
12 mm High-Current Magnet & Utility Transformer Roebel Bars (5.5 mm Strands)
ROEBEL-10/5-12mm10 strands · 5.5 mm strand width12.0×1.0 mm Bar12.09.51.85226
ROEBEL-12/5-12mm12 strands · 5.5 mm strand width12.0×1.2 mm Bar12.011.42.20226
ROEBEL-15/5-12mm15 strands · 5.5 mm strand width12.0×1.5 mm Bar12.014.52.80300
ROEBEL-30/5-12mm (Double)2×15 strands · 5.5 mm width12.0×2.9 mm Bar12.028.05.40300
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Transposition pitch length (126, 180, 226 or 300 mm) is matched to the winding harmonic pitch to cancel coupling currents.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
Continuous Hall-sensor / 77 K liquid-nitrogen I_c & n-value testZero strand dropout; cabling retention ≥ 95 % of summed strand I_cEvery Roebel length
Sample tests
IEC 61788-8 50/60 Hz AC transport & magnetisation loss testVerified full transposition and low inter-strand coupling lossQualification lot

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

IEC 61788-26 & IEC 61788-8 HTS QualifiedCERN EuCARD-2 / Feather-M2 Dipole Architecture100 % Strand-by-Strand I_c Mapped

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

Spool & Cryogenic Tag: TEBAOFLEX HTS-ROEBEL <type> Lp=<mm> Ic(77K)=<kA> LOT#
Delivery form
Non-returnable fumigated wooden or steel drums
Standard lengths
250 m · 500 m · 1000 m standard drums
MOQ
250 m (stock sizes) · 500 m (custom)
Lead time
3–5 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFHTS Roebel Cable Transposed REBCO High-Temperature – technical datasheet6 sizes · construction, technical data, approvalsXLSXHTS Roebel Cable spec data (Excel)All 6 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

How is a REBCO 2G HTS Roebel cable manufactured without edgewise bending the brittle ceramic superconductor?
Unlike copper Roebel bars (which bend ductile copper strips edgewise), a superconducting REBCO tape would delaminate if bent in-plane. Instead, a 12 mm wide REBCO coated conductor is precision-punched into a zig-zag meander pattern (two 5.5 mm strands with a 1 mm central channel), and 10 to 15 pre-shaped meander strands are interleaved out-of-plane into a fully transposed two-column bar.
When should I choose an HTS Roebel cable over a round CORC cable?
Choose HTS Roebel cable when you need maximum engineering current density (650–900 A/mm²), aligned magnetic field orientation (taking advantage of REBCO's ab-plane critical current peak), or ultra-low 50/60 Hz AC loss in rectangular transformer and motor windings. Choose round CORC cable when isotropic 3D bending in any plane is required.
Why does the central 1 mm gap between the two Roebel stacks lower AC loss?
When a perpendicular AC magnetic field penetrates a wide superconducting tape, screening currents loop across the full width, generating loss proportional to width cubed (w³). Splitting a 12 mm tape into two 5.5 mm Roebel stacks separated by a 1 mm gap cuts perpendicular-field hysteresis loss by more than half.
What factory routine tests and certificates are supplied with HTS Roebel Cable?
Every production drum of HTS Roebel Cable undergoes 100 % conductor DC resistance measurement at 20 °C, high-voltage AC/DC dielectric withstand testing, and dimensional verification per IEC 61788-26 / CERN EuCARD-2 / IEEE 1726, supplied with an EN 10204 3.1 inspection certificate.

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