Chint Surge Protector NXU-ⅡG-40kA/275V

Chint Surge Protector NXU-40/275 (i.e., model NXU-ⅡG-40kA/275V) is a surge protection device specially designed for low-voltage distribution systems, suitable for household, commercial and industrial scenarios. The following is its core information and application guidelines:

 I. Technical Parameters and Performance

1. **Core Indicators**  

   - **Maximum Continuous Operating Voltage (Uc)**: 275V AC, suitable for 220V/230V standard power grids.  

   - **Maximum Discharge Current (Imax)**: 40kA (8/20μs waveform), nominal discharge current (In) is 20kA, capable of withstanding multiple surge impacts.  

   - **Voltage Protection Level (Up)**: ≤1.5kV, which can limit the instantaneous overvoltage within the safe range of equipment, significantly lower than the tolerance threshold of most household appliances and electronic devices (usually ≥2kV).  

   - **Pole Number and Installation**: Supports 2P (single-phase) configuration, adopts 35mm guide rail installation, and the modular design allows plug-in replacement of protection modules without rewiring.

2. **Safety Certifications**  

   - Complies with IEC/EN 61643-11 and GB/T 18802.11 standards, and has passed CQC, CE, and CB certifications, suitable for most markets around the world.  

   - Built-in thermal trip and short-circuit protection mechanisms, which automatically disconnect the circuit in case of failure to avoid fire risks.

 II. Application Scenarios and Installation Recommendations

1. **Scope of Application**  

   - **Household Protection**: Installed at the secondary distribution position of the distribution box to protect household appliances such as air conditioners, refrigerators, and TVs, especially suitable for areas with frequent thunderstorms.  

   - **Commercial and Industrial**: Used in office and shopping mall distribution systems, or at the front end of industrial equipment (such as PLC, frequency converters) to resist lightning strikes and operating overvoltages generated by equipment start-up and shutdown.  

   - **Photovoltaic Systems**: Can protect inverters and components, reducing damage to new energy equipment caused by lightning strikes.

2. **Installation Points**  

   - **Location Selection**: Close to the power supply incoming end of the protected equipment, with a wiring length of ≤1.5 meters to reduce the impact of line inductance on protection effects.  

   - **Grounding Requirements**: The grounding wire diameter is ≥4mm², length ≤5 meters, and grounding resistance <4Ω to ensure that surge energy is quickly discharged into the ground.  

   - **Cooperating with Circuit Breakers**: A 10-16A circuit breaker needs to be connected in series at the front end to prevent fire caused by SPD short circuits.

 III. Maintenance and Replacement

1. **Status Monitoring**  

   - The surface of the module is equipped with a degradation indicator window, which is green when normal and pops up a red warning after failure, requiring immediate replacement.  

   - It is recommended to check the indicator lights and wiring terminals quarterly, and focus on testing the grounding system before the thunderstorm season.

2. **Lifespan and Replacement Cycle**  

   - The service life is about 5-8 years under normal use. If it frequently encounters high-current surges (such as direct lightning strikes), it needs to be evaluated for replacement in advance.  

   - When replacing, only need to pull out the old module and insert a new module of the same specification, without professional tools.

 IV. Purchase and Price Reference

1. **Channels and Prices**  

   - **International Market**: Purchases can be made through Whatsapp: 0086-13811255435

2. **Description of Alternative Models**  

   - The NXU-ⅡG series is an upgraded version of the previous NU6-II, with significant optimizations in response speed (<25ns), impact resistance times (≥20 times In), and heat dissipation design.

V. Precautions

1. **Environmental Adaptability**  

   - The operating temperature range is -40℃~+70℃, and humidity ≤95% (no condensation), suitable for harsh environments such as high temperature and high humidity.  

   - Avoid installation in areas with strong electromagnetic interference, and keep away from inductive loads (such as large motors) to reduce false triggers.

2. **Selection Recommendations**  

   - If the grid voltage fluctuates greatly (such as in remote areas), the Uc=320V model can be selected; for industrial scenarios, it is recommended to match the NXU-ⅡG-F series with remote signaling contacts to realize remote status monitoring.

VI. Typical Troubleshooting

Through reasonable selection and standardized installation, NXU-40/275 can effectively improve the stability of the electrical system and reduce the risk of equipment damage caused by surges. It is recommended to formulate a hierarchical protection scheme (such as primary + secondary + tertiary combination) according to local power grid characteristics and equipment requirements to achieve comprehensive protection.