The Air Circuit Breaker (ACB) serves as the primary protection component for main and interconnection circuits in low-voltage distribution systems. Its housing is integrally molded from high-strength flame-retardant thermosetting plastic, featuring a robust mechanical structure that withstands electrical arcs, high temperatures, and aging conditions, enabling continuous operation under standard operating conditions in distribution rooms. Equipped with a dual-breakpoint arc-extinguishing mechanism and a large-capacity arc chamber, it rapidly extinguishes arcs generated during opening operations, significantly enhancing breaking capacity and operational safety while effectively mitigating arc-induced short-circuit risks.

product highlights:

Flagship capacity coverage: Covers the entire range of rack currents from 800 A to 6300 A, with a maximum breaking capacity of up to 100 kA, making it the core component with the highest capacity and most comprehensive protection in low-voltage distribution systems.
Precise tri-level protection coordination: integrates long-time delay overload protection, short-circuit short-time delay protection, and instantaneous short-circuit protection features, allowing customizable settings for precise selective interlocking between upper and lower levels.
Modular intelligent architecture: components such as arc extinguishing chambers, smart controllers, and operating mechanisms are designed as independent units for rapid replacement or modification; supports Modbus/Profibus communication for remote monitoring and data acquisition.

Extreme environment tolerance: mechanical life ≥ 10,000 cycles, electrical life ≥ 5,000 cycles, operating temperature range-25°C to +70°C, suitable for demanding distribution applications in power plants, industrial facilities, and mining enterprises.

The electrical protection function is highly comprehensive, integrating three fundamental protections against overload, short circuit, and ground fault. It features a modular electronic trip unit that supports flexible configuration of three protection modes: long delay, short delay, and instantaneous protection. Protection parameters can be precisely set according to distribution hierarchy and load type, ensuring coordinated protection actions between upstream and downstream circuit breakers to prevent fault-induced cross-level tripping. The product offers multiple optional industrial communication interfaces and an integrated smart monitoring unit capable of real-time acquisition of circuit current, voltage, temperature rise, and switch status data. It interfaces with SCADA systems, PLCs, and smart power distribution platforms for remote monitoring, data collection, fault alerts, and remote switching operations, facilitating the digital and intelligent transformation of traditional power distribution systems.
The product strictly complies with relevant national and international standards for low-voltage switchgear systems. Prior to shipment, it undergoes rigorous testing including breaking capacity, temperature resistance, mechanical service life, and electrical lifespan. Its high-breaking-capacity design enables effective handling of sudden short-circuit events in power lines. With extended overall mechanical service life, smooth operating mechanism performance, and low failure rate, the product is suitable for continuous 24-hour operation scenarios.

application scenarios:

deployed as the primary protection component in data centers and incoming cabinets of communication rooms to ensure power supply safety for high-density computing equipment; installed in main distribution rooms of steel metallurgy plants, petrochemical facilities, and large-scale manufacturing plants to provide first-level protection for heavy industrial loads; applied in urban municipal power distribution hubs, commercial complexes, and rail transit substations to coordinate power security for large building complexes and public facilities; widely used in the main grid-connected circuits of new energy distribution systems such as photovoltaic and energy storage systems to safeguard stable power transmission. As the core protection device at the top level of low-voltage distribution systems, frame circuit breakers have become standard components in high-power distribution projects due to their comprehensive advantages of high current capacity, robust protection capabilities, and intelligent functionality.