Profibus PA LSZH SWB Cable

What is Profibus PA LSZH SWB Cable?

The Profibus PA LSZH SWB cable is an industrial 1-pair, double-screened, and galvanized steel wire braided (GSWB) process automation fieldbus cable engineered to comply with IEC/EN 61158 and UL 1581 standards. Rated for 300V (signal transmission only, not for power supply purposes), it features a nominal characteristic impedance of 100 ohms at 31.25 kHz, matching the physical layer specifications of Profibus PA systems used to connect field devices to distributed control systems.

Engineered for installations where high electromagnetic interference and severe mechanical risks coincide, the cable combines solid polyethylene insulation with a dual-stage screen—consisting of an Al/PET foil tape and a tinned copper wire braid (TCWB)—to suppress industrial noise and cross-talk. The galvanized steel wire braid (GSWB) provides radial impact strength and rodent resistance while maintaining practical flexibility, and the dual-layer LSZH compound prevents the emission of toxic halogen acid gases and opaque smoke during fire incidents.

Profibus PA LSZH SWB Cable Construction

• Conductor: Class 1 solid plain copper conductor (0.85mm diameter) ensuring stable electrical conductivity and low signal attenuation.
• Insulation: Solid Polyethylene (PE) compound delivering balanced dielectric performance and a mutual capacitance of 60 nF/km at 800 Hz.
• Separation Layer: Polyester (PET) tape applied around the twisted core to maintain internal cable geometry.
• Filler: Halogen-free (HF) compound bedding the core assembly into a circular profile.
• Dual Screen (Shield 1 & Shield 2): Overall Aluminium/Polyester tape (Al/PET) and a Tinned Copper Wire Braid (TCWB) for broadband electromagnetic noise attenuation.
• Inner Sheath: Extruded thermoplastic Low Smoke Zero Halogen (LSZH) protective bedding layer.
• Armour: Galvanized Steel Wire Braid (GSWB) providing mechanical reinforcement and rodent protection.
• Outer Sheath: Heavy-duty, flame-retardant Low Smoke Zero Halogen (LSZH) compound.
• Core Identification: 1 pair: Green and Red.
• Outer Sheath Colour: Black.

Applications

Profibus PA LSZH SWB cables are engineered for connecting process automation transmitters, flowmeters, actuators, and valve positioners to segment couplers and control systems in harsh processing environments.

• Petrochemical & Chemical Processing: Process automation fieldbus runs connecting field instrumentation to control nodes across demanding plant sectors.
• Oil & Gas Refineries: Routing through outdoor racks and plant galleries where mechanical protection and halogen-free fire safety are required.
• Water & Wastewater Treatment: Interconnecting monitoring sensors and field devices across distributed plant networks.
• Cable Trays & Industrial Ducts: Surface installations in open raceways and conduits where steel wire braiding protects against crushing forces and rodent damage.

Specifications & Dimensions

The Profibus PA LSZH SWB cable is manufactured in a 1-pair configuration with a 0.85mm solid copper conductor, a nominal overall outer diameter of 11.0mm, and a nominal cable weight of 190 kg/km. Rated for fixed installations across operating temperatures from -30°C to +80°C, it maintains a minimum bending radius of 15 times the overall diameter. Electrically, it features a maximum conductor DC resistance of 22 Ω/km at 20°C, mutual capacitance of 60 nF/km at 800 Hz, an inductance of 0.7 mH/km, and a characteristic impedance of 100 Ω at 31.25 kHz and 39 kHz (80 Ω at 1 MHz, 150 Ω at 3/20 MHz). Nominal attenuation values are certified at 3 dB/km at 39 kHz, 4 dB/km at 100 kHz, and 15 dB/km at 1 MHz, with a maximum propagation delay change of 1.7 µs/km (7.9/39 kHz), dielectric test withstand of 2.5 kVac for 1 minute (conductor/conductor and conductor/shield), transfer impedance of 15 mΩ/m (at 100 kHz and 1 MHz), and minimum insulation resistance of 5 GΩ/km.

Standards

Communication Standards: IEC/EN 61158, UL 1581
Flame Retardancy: IEC/EN 60332-1-2 (Single cable vertical flame propagation)
Halogen-Free Emission: IEC/EN 60754-1/2 (Zero halogen acid gas emission)
Smoke Density: IEC/EN 61034-1/2 (Low optical smoke density)
Voltage & Temperature Ratings: Rated 300V (signal/data only); Fixed operating temperature: -30°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 primary difference between Profibus PA and Profibus DP cables?
A: Profibus DP is engineered for high-speed factory automation (up to 12 Mbps) with a 150-ohm impedance and 0.64mm conductors, whereas Profibus PA is optimized for process automation at a fixed rate of 31.25 kbps with a 100-ohm impedance and a larger 0.85mm conductor, allowing power and data transmission over the same two-wire bus line.

Q: What mechanical advantages does Galvanized Steel Wire Braid (GSWB) offer over steel wire armour?
A: Galvanized Steel Wire Braid (GSWB) uses interwoven steel wires that provide high radial crush resistance, impact protection, and rodent resistance while maintaining much greater flexibility and ease of termination than heavy rigid steel wire armour (SWA).

Q: Why does this cable feature both Al/PET tape and a tinned copper wire braid?
A: The Al/PET tape provides 100% electrostatic coverage against high-frequency interference, while the tinned copper braid delivers low DC shielding resistance against low-frequency electromagnetic hum, providing dual-layer noise immunity across industrial frequency bands.

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, with 30% advance deposit and 70% against shipping documents) and 100% Irrevocable Letter of Credit (L/C) at sight.

Profibus PA LSZH SWB Cable – Why Choose Huadong Cable?

Huadong Cable Group manufactures Profibus PA LSZH SWB cables in strict conformity with IEC/EN 61158 and UL 1581 fieldbus standards, verified through testing protocols in ISO/IEC 17025 accredited testing facilities. Utilizing high-purity 0.85mm solid copper conductors, our automated extrusion lines apply precision solid polyethylene insulation to maintain strict mutual capacitance limits and consistent 100-ohm impedance. Combined with continuous Al/PET foil wrapping, high-coverage tinned copper wire braiding, an LSZH inner bedding, galvanized steel wire braiding, and a flame-retardant outer LSZH jacket, our cables provide dependable signal integrity and mechanical protection across demanding processing facilities.

With more than 20 years of precision cable engineering expertise, Huadong Cable Group operates high-speed braiding, planetary stranding, and halogen-free polymer 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 packaged on ISPM 15 heat-treated export wooden reels, and seamless door-to-port logistics for EPC contractors and industrial automation builders worldwide.