Profibus DP LSZH SWB Cable

What is Profibus DP LSZH SWB Cable?

The Profibus DP LSZH SWB cable is an industrial-grade, 1-pair, double-screened, and galvanized steel wire braided (GSWB) fieldbus communication cable designed to comply with IEC/EN 61158 standards for high-speed transmission across factory automation and process plant architectures. Rated for 300V (signal/data only, not for power supply purposes), it features a standardized 150-ohm characteristic impedance at frequencies above 1 MHz, providing data transmission rates up to 12 Mbps over extended bus segments.

Engineered for high-interference and mechanically vulnerable environments, the cable utilizes Foam-skin PE core insulation to minimize mutual capacitance to 29 nF/km at 800 Hz, preventing signal attenuation across long fieldbus topologies. Its multi-layer shielding architecture—consisting of an Al/PET foil tape backed by a tinned copper wire braid—suppresses industrial electromagnetic noise, while the galvanized steel wire braid (GSWB) delivers mechanical impact resistance and rodent protection without sacrificing routing flexibility. The dual-layer LSZH sheath prevents the emission of corrosive halogen acid gases and dense black smoke during fire emergencies.

Profibus DP LSZH SWB Cable Construction

• Conductor: Class 1 solid plain copper conductor (0.64mm diameter) ensuring electrical conductivity and uniform signal propagation per IEC/EN 61158.
• Insulation: Low-permittivity Foam-skin Polyethylene (PE) offering high dielectric endurance and stable high-frequency impedance.
• Separation Layer: Polyester (PET) tape applied over the twisted core to maintain assembly geometry.
• Filler: Halogen-Free Flame Retardant (HFFR) compound bedding the internal assembly into a circular profile.
• Dual Screen (Shield 1 & Shield 2): Overall Aluminium/Polyester tape (Al/PET) combined with a high-coverage Tinned Copper Wire Braid (TCWB) for dual-frequency electromagnetic shielding.
• Inner Sheath: Extruded thermoplastic Low Smoke Zero Halogen (LSZH) compound finished in violet.
• Armour: Galvanized Steel Wire Braid (GSWB) providing mechanical reinforcement, tensile strength, and rodent resistance.
• Outer Sheath: Heavy-duty, flame-retardant Low Smoke Zero Halogen (LSZH) compound, finished in black.
• Core Identification: Standard Profibus 1-pair color coding: Green and Red.

Applications

Profibus DP LSZH SWB cables are engineered for connecting programmable logic controllers (PLCs), distributed I/O racks, field sensors, variable speed drives, and supervisory control systems in heavy industrial, marine, and commercial facilities.

• Petrochemical & Refining Facilities: High-reliability fieldbus interconnections across processing units requiring mechanical defense and non-corrosive halogen-free safety.
• Heavy Manufacturing & Assembly Lines: Connecting automated robotic cells, packaging conveyors, and motor drives exposed to mechanical vibration and high EMI.
• Commercial Infrastructure & Data Centers: Critical building automation systems (BAS) and life-safety communication links requiring low smoke zero halogen performance.
• Cable Trays & Open Ladder Runs: Surface installations in plant raceways where steel wire braiding protects against incidental impact and rodent intrusion.

Specifications & Dimensions

The Profibus DP LSZH SWB cable is manufactured in a 1-pair configuration with a 0.64mm solid copper conductor, a nominal overall diameter of 11.2mm, and a nominal weight of 175 kg/km. Designed for fixed installations across ambient temperatures from -40°C to +80°C, it maintains a minimum bending radius of 10 times the overall diameter. Electrically, it features a maximum conductor DC resistance of 57.5 Ω/km at 20°C, mutual capacitance of 29 nF/km at 800 Hz, characteristic impedance of 150 Ω above 1 MHz, and a transfer impedance of 10 mΩ/m at 10 MHz. High-frequency attenuation rates are certified at 0.3 dB/100m at 9.6 kHz, 0.5 dB/100m at 38.4 kHz, 2.1 dB/100m at 4 MHz, and 4.0 dB/100m at 16 MHz, with a dielectric test withstand of 1.5 kVac for 1 minute (conductor/conductor and conductor/shield) and insulation resistance exceeding 5 GΩ/km.

Standards

Communication & Fieldbus Standard: IEC/EN 61158 (Profibus DP specifications)
Flame Retardancy: IEC/EN 60332-1-2 (Single vertical cable flame propagation test)
Halogen-Free Emission: IEC/EN 60754-1/2 (Zero halogen acid gas release)
Smoke Density: IEC/EN 61034-1/2 (High light transmittance, low optical smoke)
Voltage & Temperature Ratings: Rated 300V (signal/data only); Fixed operating temperature: -40°C to +80°C
Regulatory Compliance: European Regulation EN 50575 (CPR Compliant), Low Voltage Directive 2014/35/EU, CE Marked, RoHS Directive 2015/65/EU, REACH Directive EC 1907/2006

Frequently Asked Questions

Q: What is the mechanical difference between GSWB (braid) and SWA (wire armour) in Profibus installations?
A: Galvanized Steel Wire Braid (GSWB) uses interwoven fine steel wires that provide high flexibility and radial impact/rodent resistance while maintaining easier routing around tight tray corners, whereas Steel Wire Armour (SWA) consists of heavy helical steel rods engineered specifically for direct underground burial loads.

Q: Why does the cable feature both an Al/PET foil and a tinned copper braid?
A: The Al/PET foil provides 100% electrostatic coverage against high-frequency radio interference, while the tinned copper braid provides low DC shielding resistance to neutralize low-frequency electromagnetic hum, ensuring signal integrity across wide bandwidths.

Q: Why is Profibus DP specified with a 150-ohm characteristic impedance?
A: The Profibus DP standard (IEC 61158) defines a nominal bus impedance of 150 ohms to minimize signal reflection and wave distortion during multi-drop high-speed communications up to 12 Mbps.

Q: What commercial payment terms does Huadong Cable accept for international orders?
A: We accept standard international commercial payment terms, including Telegraphic Transfer (T/T, 30% advance deposit and 70% against shipping documents) and 100% Irrevocable Letter of Credit (L/C) at sight.

Profibus DP LSZH SWB Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures Profibus DP LSZH SWB cables in strict accordance with IEC/EN 61158 fieldbus standards and international fire safety directives. Utilizing 99.99% high-purity solid copper conductors, our automated physical foaming lines apply precision Foam-skin PE insulation to ensure exact capacitance balance and continuous 150-ohm transmission impedance. Combining continuous Al/PET foil wrapping, high-density tinned copper wire braiding, an inner LSZH bedding, galvanized steel wire braiding, and a flame-retardant outer LSZH jacket, our cables provide comprehensive electromagnetic immunity and mechanical resilience.

With more than 20 years of precision cable engineering expertise, Huadong Cable Group operates high-speed braiding, laying-up, and compounding workshops certified to ISO 9001, CE, CPR (EN 50575), RoHS, and REACH protocols. By supplying directly from our manufacturing base, we offer competitive factory pricing, 100% Mill Test Certificates (MTC) tested in accredited testing facilities, tailored continuous drum lengths on ISPM 15 heat-treated export wooden reels, and seamless door-to-port logistics for EPC contractors and industrial automation builders worldwide.