Date | 2026-06-12 07:41:42
High-voltage DC contactors are critical components for circuit control in electric vehicles, energy storage systems, and DC fast-charging stations. With the growing adoption of 800V–1500V platforms, these contactors demand housing materials with superior insulation, arc resistance, flame retardancy, and dimensional stability.
Core Advantages of BMC:
Electrical Insulation:
Volume resistivity: 10¹²–10¹⁴ Ω·cm
Dielectric strength: ≥20 kV/mm
BMC provides over 100× the safety margin compared to CE-LVD requirements, ensuring reliability in humid, hot, or corrosive conditions.
Arc Resistance:
Withstands arc durations ≥180s (GB/T 1411), significantly reducing surface erosion and maintaining insulation integrity over the contactor’s lifecycle.
Flame Retardancy:
UL94 V-0 (0.4 mm), 960°C glow-wire resistance. Suppresses fire spread during thermal runaway or short circuits.
Thermal Stability and Dimensional Precision:
Heat deflection temperature: 200–250°C
Shrinkage: ≤0.2%
Ensures precise fit with contacts and arc chambers, eliminating secondary machining.
BMC vs. Engineering Plastics:
| Property | BMC | PA66 | PBT/PC |
|---|---|---|---|
| Insulation resistivity | ≥10¹³ Ω | Good, degrades in heat/humidity | Good |
| Arc resistance | ≥180s | Limited | Limited |
| Flammability | UL94 V-0 (0.4mm) | Needs additives | Needs additives |
| Heat deflection | 200–250°C | ~200°C | 130–180°C |
| Shrinkage | ≤0.2% | 1–2% | 0.5–1.5% |
BMC’s superior insulation, arc resistance, and dimensional stability make it ideal for high-voltage, high-current applications.
Recommended Applications:
800V–1000V EV contactors: 17XX series – shrinkage ≤0.2%, dielectric strength ≥20 kV/mm
1500V energy storage contactors: 16XX series – UL94 V-0, glow-wire 960°C
High-power DC fast-charging contactors: 18XX series – temperature index ≥170°C, arc resistance ≥180s
Contact Us: For technical data or material selection support:
📧 wendy.qiu@smcbmc.com
📞 +86 13868305300
