Siemens RS-485 Cable Model 3109A

RS-485 Four-Pair Cable with Shielding

Introduction to RS-485 Cable Belden Model 3109A

The Belden 3109A cable is an RS-485 cable with 4 pairs of 22AWG Tinned Copper conductors designed for data transmission in industrial environments. This cable features Overall Beldfoil® + Tinned Copper Braid (65%) Shielding, preventing Electromagnetic Interference (EMI) and ensuring high-quality signal transmission. The outer jacket is made of PVC, which is resistant to oil, sunlight, and harsh environmental conditions. This cable meets CM, PLTC, and Oil Resistant standards, making it ideal for industrial automation, IIoT, and data communication applications.

Features of RS-485 Cable Belden Model 3109A

Designed for harsh industrial environments, IIoT, factory automation, data processing, video, and audio transmission

4 pairs of 22AWG Tinned Copper conductors for stable data transmission

Aluminum Polyester Shield (100%) + Tinned Copper Braid (65%) for noise reduction and enhanced data security

PVC Jacket resistant to oil, sunlight, and harsh environmental conditions

Operating voltage: 300V (CM, PLTC) for safe use in industrial systems

Certified for fire resistance: UL 1685, FT1, IEC 60332-1-2

Technical Specifications of RS-485 Cable Belden Model 3109A

Cable Structure

Conductor: 4 Pairs of 22AWG (7×30) Tinned Copper

Insulation: Polyethylene (PE) Foam with a thickness of 0.023 inches (0.58 mm) and a final diameter of 0.075 inches (1.9 mm)

Shielding: Beldfoil® Aluminum Polyester Tape (100%) + 65% Tinned Copper Braid

Outer Jacket: Oil and Sunlight-Resistant PVC with a thickness of 0.053 inches (1.3 mm) and a total diameter of 0.448 inches (11.4 mm)

Electrical Properties

Conductor DC Resistance: 14.7 Ohms per 1000 feet

Capacitance between Conductors: 11 pF/ft (36 pF/m)

Capacitance between Conductors and Shield: 20.9 pF/ft

Characteristic Impedance: 120 Ohms

Signal Propagation Velocity: 78%

Maximum Current per Conductor at 25°C: 2.7 Amps

Outer Shield DC Resistance: 2.53 Ohms per 1000 feet (8.30 Ohms/km)

Mechanical Properties

Operating Temperature: -20°C to +60°C

Minimum Bend Radius (Stationary/Installation): 5.5 inches (140 mm)

Maximum Pulling Tension: 100 lbs (45 kg)

Cable Weight: 82 lbs per 1000 feet

Applications of RS-485 Cable Belden Model 3109A

This cable is widely used in industrial and telecommunications systems, including:

RS-485 communication in industrial environments

Industrial Internet of Things (IIoT) in harsh conditions

Factory and Process Automation for control data transmission

Video and Audio Transmission in communication systems

Data Networks and Digital Communications in industrial environments

Indoor and Outdoor Applications resistant to sunlight and oil

Types of RS-485 Cable Belden Model 3109A

The Belden 3109A cable is available in different versions and lengths:

3109A 0101000: Black color, Reel 1000 ft

3109A 0102000: Black color, Reel 2000 ft

3109A 0105000: Black color, Reel 5000 ft

Advantages of RS-485 Cable Belden Model 3109A

High protection against noise and Electromagnetic Interference (EMI) due to dual shielding

Stable performance and data transmission without signal loss

Flexible and highly durable for use in harsh environments

Oil and sunlight resistance for industrial and outdoor applications

Fire-resistant, certified with UL 1685, FT1, IEC 60332-1-2 for enhanced safety

Supports long-distance data transmission with minimal signal loss

Conclusion

The Belden 3109A cable is an ideal choice for RS-485 communication and industrial automation in demanding environments. With a 4-pair 22AWG Tinned Copper conductor structure, dual shielding (Beldfoil® + Tinned Copper Braid), and a durable PVC jacket, this cable ensures stable performance, high safety, and long-lasting durability. It is one of the top choices for industrial control systems, IIoT, and data communication networks.