Both Chint NA8 and NA1 are air circuit breakers (ACBs)

The core difference is that the NA8 is a upgraded and replacement model of the NA1, with comprehensive enhancements in rated current upper limit, breaking capacity, environmental adaptability, contact system and arc-extinguishing technology, while maintaining compatibility in intelligent protection and basic electrical characteristics.

1. Comparison of Core Parameters

1. Technical Features and Functional Differences
2. Intelligent Protection Functions

NA1: Equipped with basic intelligent protection, supporting overload, undervoltage, short-circuit, and single-phase grounding protection. Its precise selective protection improves power supply reliability.

NA8: Upgraded based on the NA1, adding advanced measurement and fault recording (capable of recording 8 faults), zone interlocking and other safety features. Some models support current fault early warning, with a higher level of intelligence.

2. Leakage Protection Implementation

NA1: Some models have a built-in leakage protection module.

NA8: Leakage protection is achieved by combining the H-type controller, optional leakage protection function and leakage current transformer (LEC) accessory.

3. Характеристики установки и эксплуатации

– Both support 3P/4P pole numbers, drawout/fixed installation, and manual/electric operation.

– The NA8 has an optimized mechanical interlocking and secondary connector design, facilitating easier installation and maintenance.

III. Differences in Application Scenarios

1. Model Selection Recommendations
2. Capacity Expansion: When upgrading the existing NA1 system to over 6300A, the NA8 series is preferred.
3. Harsh Environments: For outdoor applications, metallurgical, chemical, new energy and other industries with large temperature fluctuations or harsh environments, select the NA8.
4. High Short-Circuit Risk: For locations close to generators, transformers and other equipment with high short-circuit current, choose the NA8 model with 150kA breaking capacity.
5. Cost Sensitivity: For conventional building power distribution and general industrial loads, the NA1 can meet performance requirements with higher cost-effectiveness.
6. Intelligence Requirements: For applications requiring fault recording, remote monitoring and early warning functions, the NA8 series is preferred.

As an upgraded model of the NA1, the NA8 achieves generational improvements in performance, reliability and environmental adaptability, while maintaining electrical and installation compatibility with the NA1, facilitating the upgrade and replacement of existing projects. Model selection should be comprehensively determined based on load capacity, short-circuit level, environmental conditions and intelligent requirements. For critical systems, it is recommended to prioritize the NA8 to improve power supply safety and stability.

As a fully upgraded version of the NA1, the NA8 is fully compatible with all basic application scenarios of the NA1, and provides superior performance and protection capabilities in scenarios such as extreme environments, large capacity, high short-circuit risk and high intelligence requirements.

1. Basic Application Scenarios of NA1 (Fully Supported by NA8)

The NA8 fully covers the standard application fields of the NA1, with compatible electrical characteristics and installation methods, enabling direct replacement and upgrade:

1. Additional Enhanced Application Scenarios of NA8 (NA1 Is Restricted or Unsuitable)

With advantages such as performance upgrade (rated current up to 7500A, breaking capacity up to 150kA), enhanced environmental adaptability (-45°C~+70°C), and improved intelligence (8 fault records, harmonic monitoring), the NA8 expands its adaptability to the following scenarios:

1. Extreme Environment Scenarios

Frigid Regions: Outdoor power distribution in Northeast/Northwest China, plateau power stations, withstanding low temperatures of -45°C (NA1 only supports -5°C)

High-Temperature Environments: Industrial furnace areas in metallurgical, glass, chemical industries, desert areas, withstanding high temperatures of +70°C (NA1 only supports +40°C)

High Humidity/Salt Spray Environments: Coastal/marine platforms, chemical parks, with optimized protection design to improve reliability

2. Large-Capacity Distribution Scenarios

Ultra-Large Factories: Production lines of steel, automotive, semiconductor industries requiring 7500A-level main switches

Data Centers/Cloud Computing: High-density IT loads requiring larger current carrying capacity and more precise protection

Regional Energy Centers: Centralized energy supply systems with multi-power interconnection, requiring high short-circuit breaking capacity (150тот)

3. High Short-Circuit Risk Scenarios

Proximity to Generators/Transformers : Areas with short-circuit current up to 120-150kA, the NA8 has a 50% higher breaking capacity

Grid Interconnection Nodes : Multi-power parallel connection with superimposed fault current, requiring coordinated protection with Icu=Ics=Icw

Industrial Heavy-Duty Starting : Frequent starting and stopping of large motors with high inrush current, optimized contact system with extended electrical service life

4. High Intelligence Requirement Scenarios

Predictive Maintenance : Critical equipment requiring fault recording (8 раз) and current fault early warning

Smart Grid Integration : Supporting communication protocols such as Modbus/Profinet, harmonic monitoring, remote monitoring

Enhanced Safety Interlocking : Complex distribution systems requiring advanced zone interlocking and optimized mechanical interlocking

III. Core Technical Guarantees for NA8 Supporting NA1 Scenarios

1. Electrical Compatibility: Identical rated voltage (400V/690V), installation dimensions, pole numbers (3P/4P) and operation methods (manual/electric), enabling direct replacement and upgrade
2. Protection Function Compatibility: Inheriting all basic protection functions of the NA1, adding advanced measurement, fault diagnosis, harmonic analysis and other functions
3. Accessory Compatibility: Supporting common accessories of the NA1 (shunt release/undervoltage release, вспомогательные контакты), while providing more intelligent accessory options
4. Scenario-Adaptive Model Selection Recommendations

The NA8 not only 100% covers all application scenarios of the NA1, but also solves the application limitations of the NA1 in extreme conditions, large-capacity and high-risk scenarios through upgrades in three dimensions: performance, environmental adaptability and intelligence . For model selection, NA1 or NA8 can be chosen according to cost in basic scenarios, while for critical scenarios with higher requirements for power supply reliability and safety, it is recommended to prioritize the NA8 series to obtain more comprehensive protection and longer service life.