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Hook-up & equipment wiresEN 50306-3 Screened300 V · 1C / Pair / Triad / QuadEN 45545-2 HL3

EN 50306-3 Thin-Wall Screened Rolling Stock CableEN 50306-3 300 V thin-wall tinned-Cu screened pair/triad/quad railway cable

Compact 300 V EMC-screened railway rolling-stock signal element certified to EN 50306-3 and EN 45545-2 HL3, assembling 1, 2 (pair), 3 (triad) or 4 (quad) EN 50306-2 thin-wall cores (0.5–2.5 mm²) inside a tinned-Cu braid screen and thin EM 104 LSZH sheath.

Flame-retardant

Oil-resistant

Low-EMC design

Approved

Cores × cross-section

Order designation: EN 50306-3 2×0.5 SM (Pair)
Outer Ø min: 3.6 mm
Outer Ø max: 3.9 mm
Weight ≈: 28 kg/km
Min. bend R: 20 mm

Check against my drum All sizes (17)

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

Voltage rating: 300 V
Configurations: 1C, 2C, 3C, 4C
EMC screen: ZT ≤ 100 mΩ/m
Fire hazard: HL1 / HL2 / HL3
Temp. range: −40…+90/+105 °C
Size range: 0.5–2.5 mm²

Typical values for this cable type, based on EN 50306-3 / EN 45545-2 HL1–HL3 — confirmed in the datasheet and quotation for your order.

Application fit

Is EN 50306-3 right for your machine?

EN 50306-3 provides a standalone EMC-screened and thin-sheathed 1-, 2-, 3- or 4-core railway signal cable for tachometer, RTD Pt100, audio/intercom and MVB/RS-485 links, and also serves as the individually screened pair/quad sub-element inside EN 50306-4 multipair cables.

Fixed installation

Suitable

Screened Pt100 RTD sensors, wheel-slide tachometers, cab intercoms, TCMS serial pairs and sub-elements.

VFD inverter to AC motor screened feeder

Suitable

Low surface transfer impedance (≤ 100 mΩ/m at 30 MHz) protects low-level railway signals near traction converters.

Trailing & towing

Not suitable

Fixed rolling-stock cabinet and coach harness cable; not for external trailing.

Use EN 50264-3-2 MMS

Energy chain / drag chain

Not suitable

When multiple pairs or >4 cores are needed in one jacket, select EN 50306-4.

Use EN 50306-4

Typical machinesTCMS, ATP/ETCS & onboard signallingWheel-slide protection (WSP) & speed sensorsTraction motor & gearbox Pt100 RTD leadsPassenger announcement & cab audio linksSub-elements for EN 50306-4 multipair harnesses

Construction

Layer by layer

Shown: EN 50306-3 2×0.5 SM (Screened Twisted Pair) — two 19-strand tinned copper EN 50306-2 thin-wall cross-linked cores (white/blue), close-woven tinned-copper wire braid screen ('S') and a 0.30 mm thin-wall black EM 104 cross-linked halogen-free outer sheath ('M').

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	19/37-strand tinned copper conductor	Concentric-stranded tinned annealed copper (19 wires for 0.5–1.0 mm², 37 wires for 1.5–2.5 mm²) per EN 50306-2EN 50306-2 / EN 50306-3
2	Thin-wall EI 101–105 core insulation	0.25–0.30 mm electron-beam cross-linked halogen-free insulation (1C, twisted pair, triad or quad)EN 50306-1 / EN 50306-2
3	Tinned-copper wire braid screen (S)	High-coverage tinned annealed copper wire braid with surface transfer impedance ZT ≤ 100 mΩ/m at 30 MHzEN 50306-3 · EN 50121-3-2
4	Thin-wall EM 104 outer sheath (M)	0.30–0.40 mm electron-beam cross-linked oil-, fuel- and −40 °C cold-resistant halogen-free outer sheathEN 50306-1 EM 104 · EN 45545-2 HL3

EN 50306-3 1×0.5 to 1×2.5 SM (Screened Single Core)

Coaxial-style EMC-screened and thin-sheathed single-core railway signal wire

EN 50306-3 2×0.5 to 2×2.5 SM (Screened Twisted Pair)

Balanced twisted pair (white/blue) with tinned-Cu braid screen and thin EM 104 sheath

EN 50306-3 3× & 4× SM (Screened Triad & Star-Quad)

3-core RTD triad (white/blue/red) and 4-core quad (white/blue/red/yellow) with braid screen

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on EN 50306-3 / EN 45545-2 HL1–HL3. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage U0/U: 300/300 V AC (max. operating 330 V AC / 495 V DC)
AC test voltage (50 Hz): 1.5 kV AC (core/core) · 1.0 kV AC (core/screen) for 5 min
Surface transfer impedance: ≤ 100 mΩ/m at 30 MHz
Max. DC conductor resistance (20 °C): 0.5 mm²: ≤ 40.1 Ω/km · 0.75 mm²: ≤ 26.7 Ω/km · 1.0 mm²: ≤ 20.0 Ω/km · 1.5 mm²: ≤ 13.7 Ω/km

Thermal

Operating temperature range: −40 °C (Class E) or −25 °C (Class P) to +90 °C (+105 °C 20,000 h class)
Short-circuit temperature: +200 °C max. (5 s)

Mechanical

Min. bending radius, fixed: 5 × overall diameter
Min. bending radius, flexing: 10 × overall diameter
Thin-wall sheath thickness: 0.30 mm nominal outer EM 104 sheath wall for ultra-compact screened pairs/quads

Resistance

Railway fire safety: EN 45545-2 Hazard Level HL1, HL2 & HL3 (Requirement Sets R15 & R16)
Oil, fuel & fluids: EM 104 cross-linked sheath resists mineral oil (IRM 902), diesel fuel (IRM 903) and cleaning agents
Smoke & toxicity: EN 61034-2 low smoke · EN 60754-1/2 zero halogen · EN 50305 low toxicity

Reference standards

Primary standard: EN 50306-3 (Thin wall screened 1 to 4 core railway rolling stock cables)
Core & material standards: EN 50306-2 (cores) & EN 50306-1 (EI 101–105 / EM 104)
Core colour code: 1C: white · 2C: white/blue · 3C: white/blue/red · 4C: white/blue/red/yellow (or numbered)
RoHS & REACH: 2011/65/EU (RoHS 2) & EC 1907/2006 compliant

Identification

Sheath colour: Black (or white when used as numbered screened sub-element inside EN 50306-4)
Core identification: Colour-coded (white, blue, red, yellow) or white with sequential black numbers
Sheath marking: TEBAOFLEX EN 50306-3 300V [n×mm²] SM E EN 45545-2 HL3
Customs tariff (HS): 8544.49 (insulated conductors ≤ 1000 V)

Sizes

17 standard EN 50306-3 configurations

Typical EN 50306-3 / EN 45545-2 HL1–HL3 outer diameter limits, copper content and cable weight.

Dimensions & weights
Order designation	Cores × mm² / AWG	AWG ≈	Outer Ø min mm	Outer Ø max mm	Copper kg/km	Weight ≈ kg/km	Min. bend R mm
1-Core Screened Thin-Wall Signal Wires (EN 50306-3 1×mm² SM)
EN 50306-3 1×0.5 SM	1×0.5	20	2.3	2.5	11	15	12
EN 50306-3 1×0.75 SM	1×0.75	18	2.5	2.7	14	18	14
EN 50306-3 1×1.0 SM	1×1.0	18	2.7	2.9	17	22	14
EN 50306-3 1×1.5 SM	1×1.5	16	3.0	3.3	23	29	16
2-Core Screened Twisted Pairs (EN 50306-3 2×mm² SM)
EN 50306-3 2×0.5 SM (Pair)	2×0.5	20	3.6	3.9	19	28	20
EN 50306-3 2×0.75 SM (Pair)	2×0.75	18	4.0	4.3	25	36	22
EN 50306-3 2×1.0 SM (Pair)	2×1.0	18	4.2	4.6	31	44	23
EN 50306-3 2×1.5 SM (Pair)	2×1.5	16	5.0	5.4	43	61	27
EN 50306-3 2×2.5 SM (Pair)	2×2.5	14	6.1	6.6	65	92	33
3-Core Screened Triads & 4-Core Star-Quads (EN 50306-3 3×/4×mm² SM)
EN 50306-3 3×0.5 SM (Triad)	3×0.5	20	3.8	4.1	25	35	20
EN 50306-3 3×0.75 SM (Triad)	3×0.75	18	4.1	4.5	33	45	22
EN 50306-3 3×1.0 SM (Triad)	3×1.0	18	4.5	4.9	42	56	24
EN 50306-3 3×1.5 SM (Triad)	3×1.5	16	5.3	5.8	59	78	29
EN 50306-3 4×0.5 SM (Quad)	4×0.5	20	4.1	4.5	31	43	22
EN 50306-3 4×0.75 SM (Quad)	4×0.75	18	4.6	5.0	42	56	25
EN 50306-3 4×1.0 SM (Quad)	4×1.0	18	5.0	5.4	53	70	27
EN 50306-3 4×1.5 SM (Quad)	4×1.5	16	5.9	6.4	75	98	32

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Dimensions and weights are typical values per EN 50306-3 / EN 45545-2 HL1–HL3. Minimum fixed bending radius shown is 5 × OD.

Electrical & current ratings
Cross-section mm²	AWG ≈	Max. DC resistance 20 °C, Ω/km	Single wire in air 30 °C, A	Multi-core bundle 30 °C, A
0.5	20	40.1	10	7
0.75	18	26.7	13	10
1	18	20	16	12
1.5	16	13.7	21	16
2.5	14	8.21	30	22

Current ratings at 30 °C ambient in free air. Apply temperature and bundle grouping factors per applicable equipment standard.

Reel check

Will it fit your machine?

A first screen using datasheet values. Engineering confirms drum geometry, acceleration and tension with your quotation.

Cable sizeDrum core diameter (mm)

Cable length on drum (m)

Drum core 300 mm ≥ 40 mmBending radius OK (5 × OD 3.9 mm)

Minimum bending radius: 20 mm
Min. drum core diameter: ≈ 40 mm
Cable weight on drum: 1.4 kg
Copper content: 1.0 kg

Indicative only: based on the datasheet outer diameter and 5 × OD bending radius. Current derating for wound layers per DIN VDE 0298-4 is assessed separately.

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
AC dielectric voltage test	1.5 kV AC (50/60 Hz)	Every manufactured length
Conductor DC resistance	IEC 60228 / ASTM (tinned copper)	Every manufactured length
Sample tests
Flame propagation test	IEC 60332-1-2 / UL VW-1 / ISO 6722-1	Per production batch
Insulation & sheath material physical properties	EN 50306-3 / EN 45545-2 HL1–HL3	Type approval

Inspection certificate

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

Product approvals

EN 50306-3 / EN 45545-2 HL1–HL3CE · RoHS 2 (2011/65/EU) · REACH

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX EN 50306-3 300V [n×mm²] SM E EN 45545-2 HL3

Delivery form: Export wooden drums, reels or coils, cut-to-length on request
Packaging: Heat-treated ISPM-15 timber drums or spools with sealed ends
Conductor / colour options: Custom core counts, stripe combinations or cut harnesses on request

Technical documents

Downloads

PDFEN 50306-3 Thin-Wall Screened Rolling Stock Cable – technical datasheet17 sizes · construction, technical data, approvals XLSXEN 50306-3 spec data (Excel)All 17 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 is the scope of EN 50306-3 within the EN 50306 series?

EN 50306-3 covers 1, 2 (twisted pair), 3 (twisted triad) or 4 (twisted quad) thin-wall EN 50306-2 cores enclosed in a tinned-copper wire braid screen ('S') and a 0.30 mm thin-wall EM 104 cross-linked outer sheath ('M'). For 2 to 48 cores or multi-pair bundles under an overall sheath, see EN 50306-4.

How are the 1 to 4 cores colour-coded under EN 50306-3?

Unless numbered white cores are requested, EN 50306-3 specifies a distinct 4-colour sequence: 1st core = White, 2nd core = Blue, 3rd core = Red, and 4th core = Yellow.

Why is EN 50306-3 3×0.5 SM or 4×0.5 SM widely used for railway RTD temperature sensors?

3-wire and 4-wire Pt100 RTD sensors on traction motors and axle boxes require balanced lead resistance, low-capacitance screening (ZT ≤ 100 mΩ/m) and an oil/fuel-resistant cross-linked EM 104 jacket in a tiny ~4.1–4.5 mm diameter.

Can EN 50306-3 elements be cabled together into a larger harness?

Yes. EN 50306-4 Type 5P/7P multipair cables are constructed by stranding multiple EN 50306-3 screened pairs/triads/quads together beneath an outer EM 104 sheath.

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03Message for our engineers

EN 50306-3 Thin-Wall Screened Rolling Stock Cable

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Reel & motion:
- Reel type: 
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- Max. acceleration: 
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