Engineering Philosophy
Engineered for universal industrial connectivity, SN Series terminal blocks deliver 660V AC/440V DC performance with flame-retardant PC housing. Supporting 0.75–50 mm² conductors at 10–150A current ratings, they provide reliable interconnections for power distribution, control circuits, and automation systems.
Key Specifications
| Parameter | Technical Data |
|---|---|
| Rated Voltage | ≤660V AC (50/60Hz), ≤440V DC |
| Current Rating | 10A–150A (by cross-section) |
| Conductor Range | 0.75–50 mm² (solid/stranded Cu) |
| Housing Material | Flame-Retardant PC (UL94 V-0) |
| Operating Temp | -40°C to +105°C |
| Mounting | DIN Rail (TH35) or Screw Fixation |
| Contact Material | Tin-plated Copper Alloy |
| Isolation Voltage | 2.5kV (50Hz, 1min) |
Advantages of PC Material
✅ Superior Flame Resistance
- Self-extinguishing properties (UL94 V-0 certified)
- Limits flame spread to <10 seconds after ignition removal
✅ Enhanced Dielectric Strength
- Withstands 600V/mm dielectric stress (IEC 60243-1)
- Surface resistance >10¹³ Ω prevents leakage currents
✅ Environmental Durability
- UV-resistant formulation maintains integrity in outdoor applications
- Withstands oils, weak acids, and industrial solvents
✅ Mechanical Resilience
- Impact strength: 85 kJ/m² (ISO 179)
- Zero cold-weather embrittlement at -40°C
Product Architecture
1. Universal Mounting System
- Tool-free DIN rail clip: Compatible with TH35 rails (EN 60715)
2. Optimized Contact Design
- Serrated contact jaws: Prevent conductor slippage under vibration
- Torque-controlled screws: 0.6–2.5Nm range (ISO 898)
3. Safety Features
- Touch-safe barriers: Finger protection per IEC 60529 IP20
Current-Cross Section Matrix
| Cross-section (mm²) | Max Current (A) |
|---|---|
| 0.75–1.5 | 10–24A |
| 2.5–6 | 25–63A |
| 10–25 | 80–125A |
| 35–50 | 150A |
Application Spectrum
- Motor Control Centers: Power bus connections
- PLC Cabinets: I/O module wiring
- Power Supplies: Transformer secondary circuits
- HVAC Systems: Compressor control lines
- Railway Signaling: Track circuit interfaces
Compliance & Certification
- International: IEC 60947-1, IEC 60947-7-1, EN 60947-7-1
- Chinese Standards: GB/T 14048.7
- Safety: CE, RoHS, REACH SVHC-free
Technical Notes:
- PC Material Advantages
- Comparative tracking index (CTI): 600V (IEC 60112)
- Glow-wire resistance: 850°C pass (IEC 60695-2-12)
- Halogen-free formulation (IEC 61249-2-21)
- Installation Guidelines
- DIN rail mounting torque: 0.8Nm (EN 60715)
- Recommended conductor stripping length: 10–12mm
- Compliance Verification
- 10,000 mechanical operation cycles (IEC 60947-1)
- Salt spray tested: 96h per ISO 9227
Post time: Aug-04-2025