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Product

High-temperature wireDIN VDE 0250-1300/500 VSi-Cu-Si Screened

SiFCuSi Copper-Braid Screened Silicone Cable300/500 V silicone-insulated, tinned-copper-braid screened and silicone-sheathed cable

SiFCuSi (SiF-Cu-Si) high-temperature screened cable combining a Class 5 tinned copper core, inner EI2 silicone insulation, concentric tinned copper braid screen, and protective outer silicone rubber sheath for -60 °C to +180 °C.

EMC screen

Low-EMC design

Flame-retardant

Ozone, UV & moisture

Configuration

Order designation: SiFCuSi 1×2.5
Outer Ø ≈: 6.60 mm
Wall thickness: 1.50 mm
Total weight ≈: 97.0 kg/km
Min. bend R (fixed): 33 mm

All sizes (14)

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Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Rated voltage: 300/500 V
Temperature: -60…+180 °C
Conductor: Sn-Cu Class 5
Architecture: Si + Cu + Si
Min bend radius: 5 × OD fixed
Size range: 0.5 to 25 mm²

Typical values for this cable type, based on DIN VDE 0250-1 / EN 50525-2-83 — confirmed in the datasheet and quotation for your order.

Application fit

Is SiFCuSi right for your machine?

Select SiFCuSi where an uninsulated outer copper braid (such as SiF-Cu) would risk shorting against live terminals or corroding in humid, oily furnace environments.

Furnace, kiln & high-temp zone

Suitable

Dual silicone elastomer walls isolate both the conductor and the copper EMC braid up to +180 °C continuous.

Switchgear & control cabinet wiring

Suitable

Outer silicone jacket prevents exposed copper screen strands from contacting adjacent busbars or terminal blocks inside hot switchgear.

Motor stator, traction & converter leads

Suitable

Used for screened RTD temperature sensors, tachogenerators, and inverter-fed auxiliary motors in thermal plants.

Motorised monospiral reel

Not suitable

Not intended for continuous drum reeling under tensile load; specify a reeling cable with anti-torsion reinforcement.

Use NSHTÖU for reeling duty

Typical machinesFurnace Pyrometry & SensorsHigh-Temp Switchgear & DrivesGlassworks & MetallurgyIndustrial Ovens & AutoclavesRailway & Marine Hot Zones

Construction

Layer by layer

Tri-layer Si-Cu-Si construction: Class 5 tinned copper core, inner EI2 silicone insulation, tinned copper wire braid screen (Cu), and outer silicone sheath (Si).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Class 5 tinned copper conductor	Fine-stranded tinned electrolytic copper (IEC 60228 Class 5)Prevents copper oxidation and solder wicking embrittlement at +180 °C
2	Inner silicone dielectric (Si)	Cross-linked silicone rubber Type EI2 (EN 50363-1)High dielectric strength and low capacitance for sensor and power leads
3	Concentric tinned copper braid (Cu)	Braided tinned copper wires (≥ 85 % optical coverage)Provides both electromagnetic shielding and earth-fault touch protection
4	Outer silicone rubber jacket (Si)	Extruded halogen-free silicone elastomer outer sheath (red-brown)Seals the copper braid against moisture, oils, chemical vapours, and shorting

SiFCuSi 1× (0.5–25 mm²)

Coaxial-style single-core screened silicone hook-up and motor lead wire

SiFCuSi Multi (2×–5G)

Screened paired and multicore silicone sensor/control assemblies

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on DIN VDE 0250-1 / EN 50525-2-83. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U: 300/500 V AC
AC test voltage (core/screen): 2000 V AC (50 Hz, 5 min)
AC test voltage (screen/water): 1000 V AC on outer silicone sheath
Insulation resistance: ≥ 200 MΩ·km at +20 °C
Screen optical coverage: ≥ 85 % tinned copper braid

Thermal

Operating temperature range: -60 °C to +180 °C continuous
Short-term peak temperature: +200 °C to +220 °C
Short-circuit conductor temp.: +250 °C
Cryogenic flexibility limit: Remains flexible down to -60 °C

Mechanical

Conductor stranding: IEC 60228 Class 5 fine-stranded tinned Cu
Min. bending radius (fixed): 5 × overall cable diameter
Min. bending radius (flexing): 12 × overall cable diameter

Resistance

Flame retardance: IEC 60332-1-2 self-extinguishing
Halogen-free & acid gas: IEC 60754-1 & IEC 60754-2
Smoke density: IEC 61034-2 low smoke emission
Weather, UV & ozone: Immune to ozone cracking and UV ageing

Reference standards

Design standard: DIN VDE 0250-1 / EN 50525-2-83 ref.
Conductor standard: IEC 60228 Class 5 tinned copper
RoHS & REACH: RoHS 3 & REACH compliant

Identification

Outer jacket colour: Red-brown (optional white or black)
Surface legend: TEBAOFLEX SiFCuSi [size] 300/500 V +180 °C
Customs tariff (HS): 8544.49

Sizes

14 standard configurations (SiFCuSi)

Engineering dimensions, conductor stranding, mass and electrical ratings for SiFCuSi per DIN VDE 0250-1 / EN 50525-2-83.

Dimensions & weights
Order designation	Cross-section / size	Conductor build	Wall ≈ mm	Outer Ø ≈ mm	Metal kg/km	Weight ≈ kg/km	Min. bend R fixed mm
Standard SiFCuSi configurations
SiFCuSi 1×0.5	1×0.5	Class 5 Sn-Cu (0.5 mm²)	1.50	5.00	23.8	51.3	25
SiFCuSi 1×0.75	1×0.75	Class 5 Sn-Cu (0.75 mm²)	1.50	5.30	27.3	58.2	26
SiFCuSi 1×1	1×1	Class 5 Sn-Cu (1 mm²)	1.50	5.40	30.1	62.2	27
SiFCuSi 1×1.5	1×1.5	Class 5 Sn-Cu (1.5 mm²)	1.50	5.70	36.1	71.8	28
SiFCuSi 1×2.5	1×2.5	Class 5 Sn-Cu (2.5 mm²)	1.50	6.60	49.1	97.0	33
SiFCuSi 1×4	1×4	Class 5 Sn-Cu (4 mm²)	1.90	8.00	68.8	139.2	40
SiFCuSi 1×6	1×6	Class 5 Sn-Cu (6 mm²)	1.90	8.60	90.3	171.7	43
SiFCuSi 1×10	1×10	Class 5 Sn-Cu (10 mm²)	1.90	9.90	133.6	241.4	50
SiFCuSi 1×16	1×16	Class 5 Sn-Cu (16 mm²)	1.90	11.00	195.4	328.5	55
SiFCuSi 1×25	1×25	Class 5 Sn-Cu (25 mm²)	1.90	12.40	287.1	456.2	62
SiFCuSi 2×0.75	2×0.75	Class 5 Sn-Cu (0.75 mm²)	1.50	7.60	43.3	106.8	46
SiFCuSi 3G1.5	3G1.5	Class 5 Sn-Cu (1.5 mm²)	1.50	9.00	77.4	166.5	54
SiFCuSi 4G1.5	4G1.5	Class 5 Sn-Cu (1.5 mm²)	1.50	9.80	94.8	200.4	59
SiFCuSi 4G2.5	4G2.5	Class 5 Sn-Cu (2.5 mm²)	1.50	11.90	141.2	297.0	71

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Outer diameters and weights are nominal engineering values for SiFCuSi subject to standard manufacturing tolerances per DIN VDE 0250-1 / EN 50525-2-83.

Electrical & rating data
Configuration	Max. DC R @ 20 °C Ω/km	Primary rating (A or kV)	Derated / AC rating	Dielectric test V AC rms
1×0.5 mm²	40.10	9.0	7.0	2,000
1×0.75 mm²	26.70	12.0	9.0	2,000
1×1 mm²	20.00	15.0	12.0	2,000
1×1.5 mm²	13.70	18.0	14.0	2,000
1×2.5 mm²	8.21	26.0	20.0	2,000
1×4 mm²	5.09	34.0	27.0	2,000
1×6 mm²	3.39	44.0	34.0	2,000
1×10 mm²	1.95	61.0	48.0	2,000
1×16 mm²	1.24	82.0	64.0	2,000
1×25 mm²	0.80	108.0	84.0	2,000
2×0.75 mm²	26.70	12.0	9.0	2,000
3G1.5 mm²	13.70	18.0	14.0	2,000
4G1.5 mm²	13.70	18.0	14.0	2,000
4G2.5 mm²	8.21	26.0	20.0	2,000

Electrical resistance at +20 °C and dielectric withstand voltages verified per DIN VDE 0250-1 / EN 50525-2-83.

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.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
Dielectric spark / high-voltage withstand test	100 % in-line spark and AC/DC dielectric withstand per DIN VDE 0250-1 / EN 50525-2-83	Every manufactured length
Conductor DC resistance & continuity check	Within maximum 20 °C resistance limit specified for SiFCuSi	Every spool or drum length
Sample tests
Thermal ageing & dimensional verification	Wall thickness, concentricity and post-ageing elongation per DIN VDE 0250-1 / EN 50525-2-83	Per production batch
Flame, outgassing or high-temperature endurance	Qualified to DIN VDE 0250-1 / EN 50525-2-83 thermal and environmental performance criteria	Type qualification

Inspection certificate

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

Product approvals

DIN VDE 0250-1 / EN 50525-2-83CE (2014/35/EU) & RoHS 3 (2015/863/EU) CompliantREACH SVHC & Halogen/Asbestos Compliance Verified

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX SiFCuSi 1×2.5 300/500 V -60/+180 °C CE

Delivery form: Precision spools, coils or export wooden drums
Standard lengths: 50 m · 100 m · 500 m · 1000 m (or cut harnesses)
MOQ: 100 m (stock sizes) · 300–500 m (custom build)
Lead time: 2–4 weeks ex-works
Incoterms: EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFSiFCuSi Copper-Braid Screened Silicone Cable – technical datasheet14 sizes · construction, technical data, approvals XLSXSiFCuSi spec data (Excel)All 14 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.

What does the designation SiFCuSi stand for?

In the German VDE designation system, 'Si' denotes silicone rubber core insulation, 'F' denotes a fine-stranded flexible Class 5 conductor, 'Cu' denotes a concentric braided tinned copper wire screen, and the final 'Si' denotes an extruded outer silicone rubber protective sheath over the braid.

Why is an outer silicone sheath ('-Si') important over the copper braid?

An exposed copper braid (SiF-Cu) can fray, absorb moisture or conductive dust, and accidentally bridge live terminals inside switchgear. The outer silicone sheath electrically isolates the screen up to 1000 V AC and seals it against oil and steam.

Can SiFCuSi be used for single-core screened motor or heater power leads?

Yes. Single-core SiFCuSi sizes from 1×1.5 mm² to 1×25 mm² are widely used for screened power leads to induction heaters, furnace fans, and high-temperature drives where single-core routing flexibility is required.

Does SiFCuSi remain flexible at sub-zero temperatures as well as high heat?

Yes. Cross-linked methyl-vinyl silicone rubber has a glass transition temperature below -100 °C, allowing SiFCuSi to remain supple from -60 °C in cryogenic/cold-storage plants up to +180 °C in furnaces.

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SiFCuSi Copper-Braid Screened Silicone Cable

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Datasheet Request a quote

SiFCuSi Copper-Braid Screened Silicone Cable300/500 V silicone-insulated, tinned-copper-braid screened and silicone-sheathed cable

Furnace, kiln & high-temp zone

Switchgear & control cabinet wiring

Motor stator, traction & converter leads

Motorised monospiral reel

SiFCuSi 1× (0.5–25 mm²)

SiFCuSi Multi (2×–5G)

Electrical

Thermal

Mechanical

Resistance

Reference standards

Identification

Inspection certificate

Product approvals

Company certificates

01Selected sizes

02Reel & motion

03Message for our engineers

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