Arc extinguishing cover of molded case circuit breaker25

Product Description

The core highlight of this arc-extinguishing cover for molded case circuit breakers lies in its optimized internal arc-extinguishing structure. It enables rapid arc segmentation and ultra-fast extinction, significantly reducing thermal damage to circuit breaker contacts and extending equipment lifespan. This provides a highly reliable arc-extinguishing solution for industrial power distribution, complete electrical equipment, and various precision power supply systems.
Efficient arc handling is critical to ensuring circuit breaker performance. This product employs a precisely engineered internal arc-quenching structure to establish a multi-stage arc-splitting and cooling system. When a fault current arc is generated during breaker operation, powerful electrodynamic forces rapidly draw the arc into the arc-quenching cover. Its specially arranged arc-splitting grids instantly fragment the long arc into multiple independent mini-arcs. Based on arc physics, smaller arcs require higher maintenance voltages and are less likely to sustain combustion under identical circuit conditions. Simultaneously, the fragmented arcs exhibit significantly increased heat dissipation surface area, enabling rapid thermal release and accelerating overall arc extinction. Field testing confirms this product reduces arc extinction time by over 40% compared to traditional arc-quenching structures, delivering markedly enhanced quenching efficiency.
Prolonged high temperatures generated by sustained arcing cause severe thermal damage to circuit breaker contacts, leading to welding, accelerated wear, and reduced breaking reliability. By accelerating arc extinction, this product substantially reduces the contact time between the high-temperature arc and the contacts. This effectively minimizes heat accumulation and erosion damage on the contact surfaces, providing core-level protection for critical circuit breaker components. This advantage ensures stable contact performance even under demanding conditions such as high-frequency operation and heavy-load service, significantly extending the maintenance cycle and service life of the entire unit while reducing operational and maintenance costs for users.
While focusing on core arc-quenching performance, the product also prioritizes adaptability and stability. Its standardized structural design strictly adheres to industry dimensional specifications, enabling seamless integration with various mainstream molded-case circuit breakers on the market without requiring additional modifications. The housing utilizes high-quality, high-temperature-resistant insulating materials combined with precision molding techniques, delivering excellent insulation properties and mechanical strength to withstand arc impacts and mechanical vibrations. Rigorous quality control throughout the entire production process covers critical aspects such as raw materials, structural precision, and arc-quenching performance, ensuring each product meets the high reliability requirements of industrial-grade applications.
Whether in heavy-duty industrial high-load distribution scenarios or precision power supply networks in commercial buildings, this arc-quenching cover delivers comprehensive protection for circuit breakers through its efficient arc-splitting and arc-quenching capabilities. It helps build a safe, stable, and long-lasting power operation system.

Composition

Six arc-extinguishing grids + two arc-isolating plates.

The arc-extinguishing grids are made of Q195 strip steel with a Zn6 blue-white coating;

The arc-isolating plates are made of red steel paper.

Parameters