FLRY-B Automotive Cable (per DIN 72551-6)
Definition:
FLRY-B designates a flexible, thin-wall, PVC-insulated single-core cable for low-voltage applications in road vehicles.
Key Technical Parameters
Conductor:
- Material: Annealed copper (bare or tinned)
- Stranding: Finely stranded (IEC 60228 Class 5)
- Cross-Section Range: 0.35 mm² to 1.0 mm² (common sizes: 0.35, 0.50, 0.75, 1.0 mm²)
Insulation:
- Material: PVC (Polyvinyl Chloride)
- Thickness: Thin-wall design (typically 0.3–0.4 mm, thinner than standard PVC cables)
- Color: Solid colors or with longitudinal stripes for circuit identification.
Voltage Rating:
- 60V AC / 25V DC (nominal voltage)
- Test Voltage: 1.5 kV AC (routine test)
Temperature Range:
- –40°C to +105°C (continuous operation)
- Short-term peak: +120°C (max 100 hours/year)
Bending Radius:
- Minimum dynamic bending radius: 4 × cable diameter
Electrical Performance
| Parameter | Value | Test Standard |
|---|
| Max. Conductor Resistance | 54.6 Ω/km (0.35 mm²)
19.5 Ω/km (1.0 mm²) | DIN EN 60228 |
| Insulation Resistance | ≥20 MΩ·km (20°C) | DIN EN 60811-2-1 |
| Dielectric Strength | 1.5 kV AC (50 Hz, 5 min) | DIN EN 60332-1 |
| Current Carrying Capacity | ~8–14 A (depending on installation) | DIN 72551-1 |
Application Requirements
Environment:
- Resistant to automotive fluids (fuel, oil, coolant, diluted acids/alkalis).
- UV-resistant for under-hood and interior use.
- Abrasion-resistant per DIN EN 50396.
Installation:
- Suitable for low mechanical stress areas (e.g., wiring harnesses with clamps).
- Not for direct exposure to moving parts or high-vibration zones without additional protection.
Flame Retardancy:
- Self-extinguishing per ISO 6722 (horizontal flame test).
- Halogen-free alternatives (e.g., FLRY-Y) required for specific eco-designs.
Marking:
- Must be marked permanently with:
FLRY-B | Cross-section (e.g., 0.75) | Manufacturer | Standard (e.g., DIN 72551-6).
Primary Applications
- Low-current signal transmission: Sensors (oxygen, temperature, speed), switches, lighting (LEDs).
- Control systems: Body control modules (BCM), infotainment, HVAC.
- Interior wiring: Dashboard, seats, door panels.
- Exterior use: License plate lights, parking sensors (if protected).
Comparison to Similar Standards
| Cable Type | Insulation Thickness | Max. Temp. | Key Use Case |
|---|
| FLRY-B | Thin-wall PVC | 105°C | General low-current |
| FLRY-A | Standard PVC | 90°C | Older/legacy systems |
| FLRY-Y | Halogen-free | 125°C | Eco-sensitive areas |
Standards Compliance
- Primary: DIN 72551-6 (German Automotive Standard)
- Alignment: ISO 6722 (Road Vehicles – 60V cables), LV 112-1 (Mercedes-Benz), VW 60306 (Volkswagen).
Note: Always verify manufacturer datasheets and OEM-specific specifications (e.g., BMW, Audi) for design validation.
This specification aligns with DIN 72551-6 requirements for FLRY-B cables in automotive electrical systems. For high-temperature/high-voltage applications, consider FLRY-W.
