The Air Circuit Breaker (ACB) is a high-performance protection device designed for low-voltage power distribution systems in industrial, commercial, and utility applications. It provides reliable protection against overloads, short circuits, and ground faults, and is ideal for main circuit breakers in large-capacity systems.
Air Circuit Breaker (ACB) Overview
1. Installation category
Class IV for main circuits of the circuit breaker and voltage tripper coil and primary coil of power transformer; Class III for auxiliary circuit and control circuits. The inclination with the vertical plane does not exceed 5° when installation.
2. Pollution class: 3
3. Altitude ≤2,000m, derating when above 2,000 m.
4. Atmospheric conditions
The relative humidity does not exceed 50% at the ambient temperature of +40°C, and a higher relative humidity at the lower temperature may be allowed;
The relative humidity at the low temperature +25°C can be up to 90%. The necessary measures can be taken for condensation on the product surface due to temperature changes.
5. Protection level IP20 for the front and IP00 for the remaining
6. Electromagnetic interference Suitable for electromagnetic environment
Air Circuit Breaker (ACB) Parameter
Key Features of Air Circuit Breaker:
- High Breaking Capacity: Rated up to 100kA for demanding applications
- Adjustable Protection Settings: For overload, short circuit, and earth fault protections
- Multiple Operation Modes: Manual, electrical, or remote-controlled
- Modular Design: Front-mounted, drawer-type or fixed-type installation options
- Advanced Trip Units: Microprocessor-based electronic trip units for precision
- Easy Maintenance: Designed with contact wear indicators and safety interlocks
- Communication Capabilities: Optional Modbus/RS485 for smart grid integration
Air Circuit Breaker Applications:
Air Circuit Breakers (ACBs) are widely used in high-power load protection and low-voltage main power control, and are particularly suitable for the following industries and systems:
•Industrial Manufacturing Plants: In heavy industries such as machinery processing, steel metallurgy, cement, and chemical plants, ACBs are installed in main distribution panels to ensure power supply stability across the facility and to prevent tripping or fire hazards caused by power surges or equipment faults.
• Commercial and Infrastructure Projects: High-rise office buildings, shopping malls, airports, and metro stations typically use ACBs in main distribution cabinets to protect all branch circuits. These breakers support remote monitoring and smart distribution needs.
• Data Centers & IT Rooms: Data centers demand extremely high power quality. ACBs act as the main protection devices, offering fast interruption, auto reclosing, and RS485 communication for remote diagnostics and control, minimizing downtime due to power failures.
• Power Generation and Distribution Systems: In power plants, wind farms, and photovoltaic inverter stations, ACBs are used for busbar protection, backup power switching, and generator output control. They are capable of handling high current surges and frequent operation demands.
• Water Treatment & Municipal Projects: ACBs are installed in wastewater treatment plants, water supply facilities, and electric pump stations to ensure the safe operation of large motors and control systems, protecting against overloads, short circuits, and arc faults.
• Medical & Emergency Facilities: Hospitals, emergency centers, and laboratories require uninterrupted power supply. ACBs provide high reliability and manual/remote switching, ensuring fast transfer to backup generators and continuous operation of life-support systems in case of power outage.
Air Circuit Breaker Packaging & Delivery
- Heavy-duty export carton with shockproof protection
- Optional wooden crate for large ACB units
- Delivery time: 10–20 working days based on order volume
- Certifications: CE, ISO9001, CCC
FAQ About Air Circuit Breaker
Q1: What is the difference between ACB and MCCB?
A: ACBs are used for higher current ratings (up to 6300A) and provide advanced protection and monitoring functions, suitable for main switchboards, whereas MCCBs are used for medium-range protection.
Q2: Can Air Circuit Breakers be integrated into smart grids?
A: Yes, many modern ACBs support Modbus/RS485 communication and remote monitoring, ideal for smart grid and industrial automation systems.
Q3: How often should an ACB be maintained?
A: Maintenance is recommended every 6–12 months, depending on usage. Modern ACBs feature indicators for contact wear and built-in diagnostics.
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