High-Quality Air Circuit Breaker Supplier
CDADA is a professional manufacturer of electrical equipment based in China. We invite you to explore our range of Air Circuit Breakers, which features a comprehensive selection of specifications and complies with international standards. Through rigorous quality control, we are committed to providing you with advanced products and comprehensive services.
What Is an Air Circuit Breaker?
An Air Circuit Breaker (ACB) is a heavy-duty low-voltage switching device designed to protect electrical distribution systems from overloads, short circuits, and earth faults. Operating at voltage levels up to 690V AC (50/60Hz) with current ratings spanning 630A to 6300A, ACBs serve as primary protection devices in main switchboards, power distribution centers, and critical industrial infrastructure.
Unlike molded case circuit breakers (MCCBs), ACBs utilize atmospheric air as the arc quenching medium, employing sophisticated arc chute systems and magnetic blowout coils to extinguish fault currents safely. This open-construction design allows for complete visibility of internal components, enabling preventive maintenance and extending operational lifespan to 15-20 years or more with proper servicing.
ACB Product Categories & Configurations
| Classification | Type | Current Range | Key Characteristics |
| Mounting Configuration | Fixed Type | 630A – 4000A | Permanent installation, cost-effective, compact footprint |
| Draw-out Type | 630A – 6300A | Withdrawable chassis, maintenance-friendly, service position testing | |
| Pole Configuration | 3-Pole | All ratings | Standard industrial applications, three-phase systems |
| 4-Pole | All ratings | Systems requiring neutral protection, adjustable neutral settings (50-100% rated current) | |
| Operating Mechanism | Manual | 630A – 3200A | Spring-charged handle operation, suitable for infrequent operation |
| Motor-operated | 800A – 6300A | Universal AC/DC motor (110V/220V), remote control capability, automatic spring charging | |
| Trip Unit Technology | Thermal-Magnetic | 630A – 1600A | Basic protection, fixed settings, economical |
| Electronic LSIG | 800A – 6300A | Microprocessor-based, adjustable L-S-I-G curves, zone-selective interlocking, communication protocols |
Frame Size Standards:
1600A Frame: 630A – 1600A (Compact distribution)
3200A Frame: 800A – 3200A (Industrial mains)
6300A Frame: 2000A – 6300A (Power generation, infrastructure)
Core Functions & Protection Capabilities
| Function | Description | Technical Parameters |
| Overload Protection (L) | Long-time inverse curve tripping | Adjustable: 0.4 – 1.0 × In, Time delay: 1s – 1000s |
| Short-Circuit Delay (S) | Selective short-circuit protection | Adjustable: 2 – 10 × Ir, Delay: 0.05s – 0.5s |
| Instantaneous Trip (I) | High-speed fault clearance | Fixed or adjustable: 5 – 20 × Ir, <50ms operation |
| Ground Fault (G) | Earth leakage detection | 20% – 100% of In, sensitive earth fault protection |
| Undervoltage Release | Automatic disconnection on voltage loss | 35% – 70% Un, adjustable time delay |
| Phase Loss Protection | Three-phase imbalance detection | <80% voltage on any phase triggers trip |
Application Environments & Use Cases
| Industry Sector | Specific Application | Typical Specifications |
| Data Centers | Main LV incoming, UPS bypass, bus-coupler | 3200A-6300A, 100kA Icu, electronic LSIG, communication-enabled |
| Healthcare Facilities | Hospital main distribution, generator synchronization | 4-pole, 4000A, isolated neutral, dual-source transfer |
| Manufacturing Plants | Motor control centers, transformer protection | 1600A-3200A, high mechanical endurance (10,000+ cycles) |
| Commercial Buildings | High-rise distribution, shopping malls, airports | 800A-2500A, draw-out type, compact footprint |
| Renewable Energy | Solar farm collection, wind turbine switchgear | 1000V AC rated, extended temperature range (-25°C to +70°C) |
| Oil & Gas | Offshore platforms, refineries, petrochemical | Tropicalized (T2), corrosion-resistant, IP54 minimum |
| Infrastructure | Metro systems, railway traction, water treatment | High shock/vibration resistance, electromagnetic compatibility |
Manufacturing Process & Production Workflow
Precision Manufacturing Sequence
Raw Material Incoming Inspection → Contact Assembly Fabrication → Arc Chute Construction → Mechanism Assembly → Trip Unit Integration → Primary Assembly → Calibration & Testing → Final Inspection → Packaging
Critical Manufacturing Stages
| Stage | Process Details | Quality Control Points |
| Contact System Production | Silver-plated copper contacts (AgNi 90/10 or AgCdO), CNC-machined contact arms, brazing in controlled atmosphere | Hardness testing (HV 80-120), silver thickness measurement (≥8μm), contact resistance <50μΩ |
| Arc Chute Fabrication | Ceramic splitter plates, steel arc runners, deionizing grids, high-temperature resistant insulation | Dielectric strength testing (2.5kV/1min), dimensional tolerance ±0.1mm |
| Mechanism Assembly | Spring steel charging mechanisms, cam-operated drive systems, anti-pumping devices | Mechanical endurance testing (10,000 operations), torque verification |
| Trip Unit Integration | PCB assembly, current transformer installation, firmware programming, communication module fitting | Functional testing at 0.5%, 5×, 10× rated current, timing accuracy ±5% |
| Final Assembly | Modular construction, draw-out chassis integration, terminal connections, enclosure fitting | Dielectric withstand (3.5kV/1min), insulation resistance (>100MΩ) |
Primary Raw Materials & Component Specifications
| Component | Material Specification | Supplier Standards | Key Properties |
| Main Contacts | Electrolytic copper (Cu-ETP) + Silver plating (Ag 99.9%) | ASTM B152, IEC 60368 | Conductivity ≥100% IACS, oxidation resistance |
| Arcing Contacts | Copper-tungsten (CuW 80/20) or Silver-tungsten carbide | ASTM B702 | High arc erosion resistance, low contact resistance |
| Contact Springs | Beryllium copper (CuBe2) or Stainless steel 301 | ASTM B196 | Fatigue life >50,000 cycles, consistent contact pressure |
| Arc Chute Plates | Cold-rolled steel SPCC + Ceramic coating | JIS G 3141 | Heat resistance >1000°C, magnetic arc deflection |
| Insulation Housing | BMC (Bulk Molding Compound) DMC or SMC fiberglass | UL 94 V-0 | Tracking index >600V, flame retardant |
| Operating Mechanism | Carbon steel S45C, heat-treated | JIS G 4051 | Tensile strength ≥600MPa, wear-resistant |
| Busbars | T2 copper (99.9% pure) or 6061-T6 aluminum | ASTM B187 | Current density 1.5-2.0 A/mm², tin plating optional |
| Electronic Components | Industrial-grade PCBs, Hall-effect sensors, ARM processors | IEC 60721-3-3 | Operating temperature -25°C to +70°C, EMC compliant |
| Enclosure | CRCA steel sheet (1.5-2.0mm) + Epoxy powder coating | JIS G 3141, ISO 12944 | Corrosion resistance C3-C5, IP40-IP54 |
Standards Compliance & Testing Protocols
International Standards Framework
| Standard | Scope | Applicable Ratings |
| IEC 60947-2 | Low-voltage switchgear - Circuit-breakers | Global baseline for ACB design, testing, performance |
| EN 60947-2 | European harmonized version of IEC 60947-2 | CE marking compliance, EU market access |
| GB/T 14048.2 | Chinese national standard equivalent to IEC 60947-2 | CCC certification, China market |
Mandatory Type Tests (IEC 60947-2)
| Test Category | Specific Test | Acceptance Criteria |
| Dielectric Performance | Power-frequency withstand (2.5kV-3.5kV/1min) | No breakdown, no flashover |
| Impulse withstand voltage (8kV-12kV 1.2/50μs) | No disruptive discharge | |
| Temperature Rise | Continuous current at rated In | Terminal temp ≤80K (silver-plated), ≤65K (bare copper) |
| Short-Circuit Breaking | Ultimate breaking capacity (Icu) - 3 operations | Successful interruption, no permanent damage |
| Service breaking capacity (Ics = 50%-100% Icu) | 3 operations, continued serviceability | |
| Short-Time Withstand | Icw for 1s or 3s (thermal & dynamic stress) | No deformation, contact welding, or insulation damage |
| Mechanical Endurance | No-load operations (typically 10,000-20,000 cycles) | <5% parameter drift, no mechanical failure |
| Electrical Endurance | Load operations at rated current (typically 2,000-6,000 cycles) | Contact wear <50%, consistent trip characteristics |
| Trip Unit Accuracy | Verification of L-S-I-G curves | ±10% current accuracy, ±20% time accuracy |
| Environmental | Damp heat (IEC 60068-2-30), cold, dry heat | Functional after conditioning, no corrosion |
Factory Quality Control & Inspection Standards
Incoming Material QC (IQC)
| Material | Inspection Items | Sampling Plan | Equipment |
| Copper contacts | Chemical composition, conductivity, dimensional tolerance | AQL 0.65, ISO 2859 | Spectrometer, conductivity meter, CMM |
| Silver plating | Thickness (XRF), adhesion (tape test), porosity | 100% visual, 5% thickness check | X-ray fluorescence, metallurgical microscope |
| Steel components | Hardness, tensile strength, surface finish | AQL 1.0 | Rockwell hardness tester, tensile machine |
| Electronic components | Function test, parameter verification, solderability | 100% AOI, 5% functional | LCR meter, oscilloscope, X-ray inspection |
In-Process Quality Control (IPQC)
| Station | Control Parameters | Frequency | Method |
| Contact assembly | Contact gap, pressure, alignment | Every 100 units | Force gauge, feeler gauge, optical comparator |
| Arc chute assembly | Splitter plate spacing, magnetic circuit integrity | Every 50 units | Go/no-go gauges, flux density meter |
| Mechanism calibration | Spring charge time, trip force, closing speed | Every unit | Automated test bench, data logging |
| Trip unit programming | Curve verification, communication test | 100% | Primary injection test set, protocol analyzer |
Final Quality Control (FQC) & Outgoing QC (OQC)
| Test Item | Standard | Sample Size |
| Dielectric withstand voltage | 3.5kV AC/1min | 100% |
| Insulation resistance | >100MΩ @ 500V DC | 100% |
| Contact resistance | <50μΩ per pole | 100% |
| Timing characteristics | Close/trip time, sync between poles | 100% |
| Overcurrent trip verification | 3×In (instantaneous), 1.05×In (overload) | 100% |
| Mechanical operation | 5 close-open cycles | 100% |
| Visual & dimensional inspection | Zero defects on critical dimensions | 100% |
| Packaging integrity | Drop test, vibration test (ISTA 3A) | AQL 1.0 per lot |
Production Infrastructure & Manufacturing Capability
Advanced Production Equipment
| Equipment Category | Machine Specification | Function | Capacity |
| CNC Machining Center | 5-axis vertical machining center (Mazak/Haas) | Precision contact machining, complex geometries | 5,000 contact sets/month |
| Stamping & Forming | 200-ton progressive die press (Bruderer) | Copper busbar forming, contact spring production | 10,000 components/day |
| Surface Treatment | Automated silver plating line (Barrel/Rack) | Contact plating thickness 8-20μm | 2,000 kg/day |
| Plastic Molding | BMC injection molding machine (300-ton) | Arc chute housings, insulation components | 5,000 pieces/day |
| Assembly Automation | Robotic assembly cells (ABB/Fanuc) | Mechanism assembly, consistency critical operations | 500 units/day per line |
| Testing Equipment | Primary injection test set (10,000A capacity) | High-current trip verification | 200 units/day |
| High-voltage withstand tester (5kV AC) | Dielectric testing | 300 units/day | |
| Mechanical endurance test bench | 20,000 cycle automated testing | 50 units simultaneous |
Production Capacity & Lead Times
| Product Category | Monthly Capacity | Standard Lead Time | Urgent Order Capability |
| Fixed Type ACB (630A-1600A) | 3,000 units | 2-3 weeks | 5 days (stock components) |
| Fixed Type ACB (2000A-4000A) | 1,500 units | 3-4 weeks | 7 days |
| Draw-out Type ACB (800A-3200A) | 2,000 units | 3-4 weeks | 10 days |
| Draw-out Type ACB (4000A-6300A) | 800 units | 4-6 weeks | 14 days |
| Custom Configurations | Project basis | 6-8 weeks | 4 weeks |
Engineering & Technical Team Structure
| Department | Personnel | Expertise | Responsibilities |
| R&D Engineering | 5 engineers | Power systems, electromagnetic design, embedded software | New product development, customization, patent portfolio |
| Process Engineering | 15 engineers | Manufacturing processes, automation, quality systems | Production line optimization, SOP documentation, yield improvement |
| Testing & Validation | 12 engineers | High-power testing, environmental simulation, reliability engineering | Type testing coordination, failure analysis, certification management |
| Application Engineering | 10 engineers | Power system protection, selective coordination, field commissioning | Customer technical support, scheme design, site commissioning |
| Quality Assurance | 20 technicians | ISO 9001, statistical process control | Supplier audit, process audit, corrective action management |
Certifications & Compliance Documentation
| Certification | Issuing Body | Scope | Validity |
| ISO 9001:2015 | ZHONGDA/ SGS | Quality management system | Annual surveillance |
| IEC 60947-2 Type Test | Intertek | Product safety & performance | Per product series |
| CE Marking | Notified Body (Intertek) | EU market access | Design-dependent |
| CCC (China) | CQC | Chinese compulsory certification | 5-year validity |
Why Our ACB Manufacturing Stands Apart
Our production facility represents two decades of specialization in low-voltage power distribution equipment, delivering air circuit breakers that exceed industry benchmarks through:
Vertical integration: In-house contact plating, precision machining, and electronic trip unit programming ensure complete quality control
Testing investment: $2M+ in high-power testing laboratories capable of 150kA short-circuit verification
Digital manufacturing: MES-integrated production lines with full traceability (batch records, component serialization)
Customization capability: From specialized tropical coatings to proprietary communication protocols, we engineer to specification
Global compliance: Multi-standard certification strategy enabling seamless market entry across 80+ countries
For technical specifications, selective coordination studies, or factory audit scheduling, our engineering team provides direct consultation to ensure your power protection architecture meets both current demands and future expansion requirements.
- View as
1600A Air Circuit Breaker
CDADA is a reliable manufacturer of 1600A Air Circuit Breaker, which is CB-certified with intelligent protection, built for heavy-duty industrial power distribution needs. Made with high-grade components and robust construction, this air circuit breaker is easy to operate and maintain, fitting seamlessly into industrial power systems. It's the top choice for wholesale and OEM procurement, delivering stable, reliable performance for all industrial power protection demands.
2000A Air Circuit Breaker
2000A Air Circuit Breaker is CDADA factory's product, it is perfect for wholesale and bulk procurement, with IEC/GB certification. The product offers drawout or fixed type options, ideal for industrial power distribution. We welcome OEM orders, as a reliable ACB supplier with open communication interface, easy to deploy in power systems.
3200A Air Circuit Breaker
CDADA is a professional ACB manufacturer and supplier in China. This 3200A Air Circuit Breaker (DAA2-3200 Series) is perfect for bulk buying, fit for AC 50Hz, 690V networks. It boasts intelligent protection and precise selective tripping, with drawout/fixed options. It’s a dependable low voltage ACB for bulk buyers needing stable power distribution performance.
4000A Air Circuit Breaker
4000A Air Circuit Breaker is offered by the reliable manufacturer, CDADA. It is a top pick for bulk procurement, engineered for AC 50Hz, 690V heavy-duty power systems. This ACB features intelligent protection and precise selective tripping, with flexible drawout and fixed configurations. Ideal for switchgear setups, we welcome bulk orders and OEM projects for this high-capacity ACB.
6300A Air Circuit Breaker
Choose CDADA as your supplier, our 6300A Air Circuit Breaker is a top choice for bulk sourcing, an IEC/GB certified high-capacity unit built for power plants and heavy industrial use. It comes in drawout and fixed types, engineered for reliable low-voltage power protection. We're a trusted manufacturer, welcoming OEM projects and bulk ACB orders for global industrial buyers.
3 Phase Air Circuit Breaker
CDADA is the manufacturer of 3 phase air circuit breaker, this product is ideal for bulk sourcing, a versatile solution built for industrial power distribution networks with 400A-6300A rating. It features intelligent protection and precise selective tripping, compliant with GB14048.2 and IEC60947-2. It's the go-to 3P ACB for OEMs and distributors needing robust, reliable low-voltage switchgear for global projects.
CDADA is a Air Circuit Breaker manufacturer and supplier in China. Our factory serves diverse industries such as power systems, building automation, and industrial manufacturing, offering flexible OEM/ODM solutions.
