Is your machine wiring causing expensive downtime?
You know the feeling. Your production line is running fast. The robotic arm is moving. The conveyor belt is spinning. But suddenly, the system throws an error. The sensor signal drops out. You check the wires and find a broken core or a short circuit.Cables in moving parts face a tough life. They get pulled, twisted, and bent millions of times. Standard wires crack under this stress. Electrical noise from nearby motors messes up your data signals. If the cable isn’t flexible enough, it creates drag. If it’s not tough enough, it breaks.You need a cable that moves as freely as your machine. It must resist bending fatigue. It must block electromagnetic interference (EMI). And it must last for years without cracking.This is where the German imported UNITRONIC FD CY 7×0.25mm² comes in. It is not just a wire. It is a high-performance solution built for power chains, drag chains, and dynamic automation.
What makes this 7-core 0.25mm² cable special?
This cable is a market leader for a reason. It comes from LAPP Group, a German engineering giant. They invented the standard for flexible data cables. The “FD” in the name stands for “Flexible Data” or “Drag Chain” use. The “CY” indicates a PVC sheath with a copper braid shield.It is specifically designed for low-frequency data and control signals. You use it to connect sensors, actuators, and controllers. The 7 cores give you enough space for power and multiple signal lines in one jacket.The construction is optimized for energy chains. This means the outer diameter is small, but the bending radius is tight. It fits into small cable carriers without taking up too much space. This leaves room for other hoses or cables in your machine.
Technical Specifications: The numbers you need to know
We keep things transparent. Here are the exact specs for part number 0027429:
Physical Properties
- Cores: 7 cores (multi-core).
- Conductor Size: 0.25 mm² per core.
- Conductor Material: Tinned copper, extra-fine stranded (Class 6). This means the copper is made of many tiny wires, not one thick one. This is the secret to its flexibility.
- Outer Diameter: 6.7 mm. This is a compact size for a 7-core shielded cable.
- Weight: 75 kg per km.
- Copper Content: 39.6 kg per km. High copper means better conductivity and less voltage drop.
- Color: Grey (standard PVC color).
Performance Limits
- Bending Radius (Flexing): 7.5 times the outer diameter. For this cable, that is about 50 mm. It can bend very sharply without damage.
- Bending Radius (Fixed): 4 times the outer diameter. About 27 mm.
- Temperature Range (Moving): -5°C to +70°C.
- Temperature Range (Fixed): -40°C to +80°C.
- Test Voltage: 1500 V.
- Peak Operating Voltage: 350 V.
- Max Inductance: 0.65 mH per km. Low inductance means clean signal transmission.
Material & Safety
- Insulation: PVC (Polyvinyl Chloride).
- Sheath: PVC.
- Shielding: Tinned copper braid. It covers the whole cable to stop noise.
- Flame Retardant: Yes, according to EN 60332-1-2. It does not spread fire easily.
- Oil Resistance: Standard PVC has limited oil resistance. For oily environments, you might need PUR versions, but PVC is great for general industrial use.
Why choose a shielded cable for data transmission?
You might ask, “Why do I need a shield?” Industrial environments are noisy. Big motors, welders, and VFDs (Variable Frequency Drives) create electromagnetic fields.If your data cable has no shield, these fields create “ghost signals” in your wires. Your PLC might read a “1” when it should be a “0”. This causes positioning errors or safety stops.The copper braid shield acts as a cage. It catches the noise and sends it to the ground. It keeps your data clean. This is critical for:
- Encoder signals.
- Safety sensor loops.
- Analog sensor data (0-10V).
- Bus systems in noisy areas.
The shield is made of tinned copper. Tin prevents the copper from oxidizing. It ensures a good ground connection for a long time.
Perfect applications for this drag chain cable
This cable shines where movement happens. Here are the top use cases:
Automated Assembly Lines
In car factories or packaging plants, parts move on conveyors. The cables on the moving trolley need to flex constantly. This FD CY cable handles the constant “sweeping” motion. It resists abrasion against the chain links.
CNC Machines and Robotics
Robot arms have joints that rotate 360 degrees. The cable going into the arm must bend millions of times. The extra-fine stranded conductors prevent “metal fatigue.” The cable does not break even in tight bends inside the robot wrist.
Measurement and Control Systems
For measuring circuits, signal stability is key. The low capacitance (approx 110 nF/km) ensures that high-frequency signals don’t get distorted. It is perfect for connecting measurement probes to control cabinets.
Fire Alarm and Security Systems
Since the cable is flame retardant (EN 60332-1-2), it is safe for indoor building wiring. It is often used in access control systems and intrusion detection systems where cables run through moving doors or rotating cameras.
How does it compare to cheaper alternatives?
You will find cheaper 7-core cables online. But most of them are not “FD” rated.
- Standard Cables: They have solid or coarse stranded wires. They crack after 100,000 bends.
- Unshielded Cables: They pick up noise. You spend hours troubleshooting “ghost” errors.
- Thick Cables: They have a large outer diameter. They make your cable chain heavy and slow.
The UNITRONIC FD CY uses a special lay length for the twisting. The cores are twisted in different lengths. This prevents them from rubbing against each other. It reduces friction inside the cable. This is why it lasts 2 to 8 million cycles.The PVC sheath has a low-adhesion surface. It slides smoothly in the plastic chain. It doesn’t snag. It doesn’t get stuck.
Quality you can trust from Germany
LAPP Group is not a budget brand. They are a premium supplier. When you buy this cable, you are buying consistency.
- Every meter is tested for 1500V.
- The copper purity is strictly controlled.
- The diameter is precise. It fits standard cable glands and connectors.
For a trading company like yours, this means fewer returns. Your customers won’t complain about stiff wires or broken cores. You build a reputation for selling reliable industrial parts.
Ready to upgrade your wiring?
Don’t let cable failure stop your machines. Use the same cable that top German engineers use in their factories. The UNITRONIC FD CY 7×0.25mm² is the gold standard for flexible, shielded data transmission.It is in stock and ready to ship. We offer competitive pricing for bulk orders and export shipments.Send us an inquiry today. Tell us your required length and destination port. We will send you a detailed quotation within 24 hours. Let’s keep your customers’ machines running smoothly.