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Air Circuit Breakers
Air Circuit Breakers (ACBs) are heavy-duty protective devices designed for low-voltage power distribution systems, typically rated for currents from 630A up to 6300A and voltages up to 690V AC. These circuit breakers utilize air as the arc extinguishing medium, offering superior breaking capacities often exceeding 65kA at 415V. ACBs are characte...
Air Circuit Breakers (ACBs) are heavy-duty protective devices designed for low-voltage power distribution systems, typically rated for currents from 630A up to 6300A and voltages up to 690V AC. These circuit breakers utilize air as the arc extinguishing medium, offering superior breaking capacities often exceeding 65kA at 415V. ACBs are characterized by their robust construction, typically available in 3-pole (3P) and 4-pole (4P) configurations, with electronic trip units providing adjustable protection curves (L, S, I, G) for long-time delay, short-time delay, instantaneous, and ground fault protection. They feature draw-out or fixed mounting options, allowing for easy maintenance and replacement without disturbing main connections. Key technical parameters include rated operational voltage (Ue), rated insulation voltage (Ui), rated impulse withstand voltage (Uimp), and utilization categories like Category A (non-selectively coordinated) or Category B (selectively coordinated). Modern ACBs integrate advanced communication protocols such as Modbus, Profibus, or Ethernet/IP for seamless integration into building management and industrial automation systems.
Air Circuit Breakers are predominantly deployed in main distribution boards (MDBs), substations, and critical power infrastructure within commercial buildings, industrial plants, data centers, and large-scale facilities. They serve as the primary incoming protection for transformers, generators, and busbar trunking systems, ensuring selective coordination to isolate faults while maintaining power to healthy sections. In industrial settings, ACBs protect large motors, capacitor banks, and welding equipment against overloads and short circuits. They are essential in marine and offshore applications, where high fault currents and harsh environmental conditions demand reliable protection. Additionally, ACBs are used in renewable energy installations, such as solar farms and wind turbines, to safeguard inverters and power conversion systems. Their ability to handle high continuous currents and provide remote monitoring makes them ideal for critical processes in hospitals, airports, and manufacturing facilities.
Our inventory includes a comprehensive range of Air Circuit Breakers from leading manufacturers, covering various frame sizes and breaking capacities. Key subcategories include fixed-type ACBs (e.g., models like Masterpact NW, Emax E2, and SACE S3) and draw-out type ACBs (e.g., Masterpact NT, Emax E1, and SACE S5). Article codes typically follow a structured format: for example, "NW25H1" indicates a Masterpact NW frame with 2500A rating and high breaking capacity (H), while "E2N1600" denotes an Emax E2 frame at 1600A with normal breaking capacity. Other common codes include "S3H630" for a SACE S3 frame at 630A high breaking, and "NT16H1" for a Masterpact NT at 1600A high breaking. We also stock electronic trip units (e.g., Micrologic 5.0, 6.0, 7.0) and accessories like shunt releases, undervoltage releases, and auxiliary contacts. Each product is accompanied by detailed technical datasheets, wiring diagrams, and compliance certifications (IEC 60947-2, UL 1066).
Partnering with Electric Automation Network ensures access to genuine, certified Air Circuit Breakers with real-time pricing and global express shipping. Our team of specialized electrical engineers provides personalized technical support, assisting with selection, coordination studies, and integration into existing systems. We offer comprehensive documentation, including dimensional drawings, trip curve charts, and installation manuals, ensuring seamless project execution. Whether you need a single replacement unit or a bulk order for a large-scale installation, our logistics network guarantees fast delivery worldwide. Benefit from our expertise in low-voltage power distribution and automation to optimize your electrical infrastructure, reduce downtime, and enhance system reliability. Contact our engineers for tailored solutions and competitive quotations.
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