Chint Air Switch NXB63-3P/D32 circuit breaker

Chint Air Switch NXB63-3P/D32 is a three-pole miniature circuit breaker suitable for industrial and commercial scenarios, mainly used for overload protection, short-circuit protection and circuit isolation. The following is a collation of its core information:

 1. Model Parsing and Technical Parameters

- **Model Meaning**:

  - **NXB-63**: Chint NXB series miniature circuit breaker with a frame current of 63A.

  - **3P**: Three-pole design, suitable for three-phase circuits (such as 400V systems).

  - **D32**: D-type tripping curve, rated current 32A, suitable for loads with high inrush current (such as motors).

- **Key Parameters**:

  - **Rated Voltage**: 400V AC (3P specification), frequency 50Hz.

  - **Breaking Capacity**: 6kA (complies with IEC 60898-1 standard), capable of quickly cutting off short-circuit current.

  - **Tripping Characteristic**: D-type curve, suitable for equipment with large starting current, such as motors, transformers, etc.

  - **Certification**: Certified by CCC, CE, TUV, etc., but UL certification is not explicitly mentioned, so it may not be applicable to the North American market.

 2. Application Scenarios and Functions

- **Applicable Fields**:

  - Overload and short-circuit protection for industrial power distribution systems, commercial buildings and residential three-phase circuits.

  - Particularly suitable for motor control circuits, as it can withstand the instantaneous high current during motor startup.

- **Core Functions**:

  - **Overload Protection**: When the current exceeds the rated value, the bimetallic strip heats up and bends to trigger tripping.

  - **Short-Circuit Protection**: The electromagnetic tripping device quickly cuts off the circuit in case of a short circuit (response time < 0.1 seconds).

  - **Isolation Function**: After the handle is opened, the circuit can be safely maintained, meeting the requirements of electrical isolation.

3. Installation and Usage Notes

- **Installation Method**:

  - Standard 35mm guide rail installation, supporting DIN EN 60715 standard, with simple installation.

  - The wiring method is top-in and bottom-out, and it is necessary to ensure that the cross-sectional area of the wire matches the current (for example, 32A is recommended to use 6mm² copper wire).

- **Environmental Requirements**:

  - Operating temperature range: -5℃ to +40℃, humidity ≤ 95%RH (no condensation).

  - Avoid installation in environments with high temperature, humidity or corrosive gases.

- **Maintenance Suggestions**:

  - Regularly check the flexibility of the handle operation and the state of the contacts to ensure no ablation or oxidation.

  - It is recommended to replace the circuit breaker after 10 years or 10,000 operations to ensure reliability.

 4. Purchase and Market Applicability

- **International Market**:

  - This model has not explicitly obtained UL certification and may not comply with North American electrical standards (such as NEC).

  - If American users need to use it, it is recommended to purchase through importers via Whatsapp: 0086-13811255435, but they need to confirm the compatibility and certification issues by themselves.

 5. Suggestions for Alternative Solutions

- **Alternative Models for the North American Market**:

  - If UL certification is required, you can consider Chint's NXB series variants designed for North America (such as NXB-63 3P D32 UL), or international brands such as Siemens 5SJ6 and ABB S203 series.

  - Note that the commonly used voltage in North America is 120/240V, while NXB63-3P/D32 is a 400V specification, so direct use may require a transformer for voltage reduction.

 6. Risk Tips

- **Compatibility Risks**:

  - Installation of non-UL certified products in the United States may violate local electrical regulations, leading to insurance claims rejection or safety hazards.

  - Three-phase 400V equipment is incompatible with the North American single-phase 240V system, and a professional electrician is required to evaluate the transformation plan.