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Low water absorption + excellent dimensional stability
Water absorption is only 0.3%–1.1% (much lower than PA6/PA66), ensuring no deformation or warpage in humid environments and maintaining precise fitting clearances for circuit breaker switching, arc extinguishing, and insulation.
Excellent electrical insulation properties
Volume resistivity: 1×10¹² Ω·cm
Dielectric strength: 30–36 kV/mm
Comparative Tracking Index (CTI): ≥600 V (can be higher with flame-retardant modification)
Meets insulation and tracking resistance requirements for circuit breakers rated AC 400V–690V and DC 1000V.
High low-temperature toughness
Brittle temperature is -60°C, providing excellent impact resistance without cracking in alpine, outdoor, or cold-storage environments, ensuring mechanical safety and service life.
Oil resistance, chemical resistance, and arc resistance
Resistant to transformer oil, grease, weak acids and alkalis, and arc-extinguishing media; features good arc and tracking resistance, ideal for frequent switching and short-circuit arc scenarios.
Heat resistance and long-term aging stability
Melting point: 200–210°C, long-term service temperature: 80–120°C. Heat-stabilized grades withstand temperature rises and short-circuit thermal shocks in circuit breakers.
Eco-friendly bio-based material
Derived from castor oil, with low VOC and recyclability, complying with EU RoHS, REACH, and low-carbon requirements for new energy applications.
II. Common Modification Solutions (Essential for Circuit Breaker Housings)
Unmodified PA1010 is UL94 HB grade; housings require flame retardancy and reinforcement:
Flame-retardant PA1010 (V‑0/5VA)
System: Halogen-free (phosphorus-nitrogen) or low-halogen flame retardant
Rating: UL94 V‑0 (1.6mm), 5VA; CTI ≥500–600V
Function: Self-extinguishing, non-dripping, and anti-flammability under short-circuit, overload, and arcing conditions.
Glass fiber reinforced GF20–30%
Improves: stiffness, strength, heat resistance, creep resistance, and dimensional accuracy
Suitable for: large housings, bases, arc chamber frames, mounting surfaces.
Low-warpage / mineral-filled
Enhances: flatness, mold fitting precision, and insulation consistency
Used in: precision molded case circuit breakers (MCCB) and miniature circuit breakers (MCB).
Weather-resistant / UV-resistant / anti-aging
Designed for: outdoor circuit breakers, distribution boxes, and new energy equipment.
III. Typical Components in Circuit Breakers
Housings, bases, and middle covers of miniature circuit breakers (MCB)
For residential and industrial use up to 63A: low water absorption, stable dimensions, good insulation, impact resistance, and UL94 V‑0 flame retardancy.
Housings and bases of molded case circuit breakers (MCCB), arc chamber supports
For 100–630A applications: high strength, arc resistance, heat resistance, oil resistance, and long-term stability.
Housings of residual current circuit breakers (RCCB/RCBO), transformer covers, terminal blocks
Requires precise fitting, high insulation, low moisture absorption, and anti-leakage performance.
Housings of DC circuit breakers for new energy vehicles (EV) and energy storage systems
Features: high-voltage insulation, low water absorption, low-temperature resistance, flame retardancy, environmental protection, and lightweight.
Circuit breaker accessories: operating handles, latches, interlocks, seals
Benefits from: wear resistance, self-lubrication, good toughness, and weather resistance.
IV. Material Comparison: PA1010 vs. Common Circuit Breaker Materials
| Properties | Flame-retardant GF PA1010 | Flame-retardant PA66 | DMC/BMC (Bulk Molding Compound) | Flame-retardant ABS |
|---|---|---|---|---|
| Water absorption | Very low (0.3–1.1%) | High (1.2–2.5%) | Very low | Low |
| Dimensional stability | Excellent | Fair | Good | Good |
| Insulation / CTI | Excellent (600V+) | Good (500V) | Excellent | Moderate |
| Low-temperature resistance (-40°C) | No cracking | Prone to cracking | Brittle | Brittle |
| Long-term heat resistance | 100–120°C | 120–140°C | 150–180°C | 60–80°C |
| Oil / chemical resistance | Excellent | Good | Good | Poor |
| Processability | Easy injection molding | Injection molding | Compression molding (difficult for complex parts) | Injection molding |
| Cost | Medium-high | Medium | Medium-low | Low |
| Application positioning | Precision / weather-resistant / new energy / outdoor | General indoor use | High voltage / ultra-high temperature |
V. Summary: Core Value of PA1010 for Circuit Breaker Housings
High precision and stability: Stable fitting clearances, reliable arc extinguishing, and no jamming in humid or extreme temperature environments.
High safety insulation: high CTI, arc resistance, UL94 V‑0 flame retardancy, and low leakage risk.
Strong environmental adaptability: Operates reliably from -60°C to 120°C, with oil resistance and weatherability for outdoor, new energy, and alpine applications.
Substitution value:
Replaces PA66 with better stability, low-temperature toughness, and chemical resistance.
Replaces DMC with efficient injection molding, recyclability, and high toughness.
Replaces ABS with superior safety, heat resistance, and durability.
