Instruction Manual for Chint NBX - 63C40 Circuit Breaker

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#### 1. General Introduction

The Chint NBX - 63C40 circuit breaker is a miniature circuit breaker designed for overload and short -

 circuit protection in residential and small - scale power distribution systems. It offers reliable and efficient

 protection to ensure the safety of electrical circuits.

#### 2. Model Explanation

- **NBX - 63**: The frame current rating is 63A, which means the maximum current that the circuit breaker 

can carry is 63A.

- **C40**: The rated current is 40A. It has a C - type tripping curve, which is suitable for general applications 

such as lighting circuits and resistive loads.

#### 3. Main Technical Parameters

- **Number of Poles**: Commonly available in 2P (single - phase, controlling both the live wire and the neutral wire).

- **Breaking Capacity**: Approximately 6kA. Some models may have a higher breaking capacity as specified.

- **Rated Voltage**: 220V for household use or 380V for three - phase applications.

- **Application Scenarios**: Suitable for household distribution boxes, lighting circuits, and protection of 

small electrical appliances.

#### 4. Functional Features

- **Overload Protection**: When the current exceeds 40A, the circuit breaker will trip within a certain period of time

 to prevent damage to the circuit due to over - current.

- **Short - circuit Protection**: In case of a sudden large - current short - circuit fault, the circuit breaker will 

immediately disconnect the circuit to avoid potential hazards such as fire.

- **Leakage Protection (Optional)**: Some models, such as NXBLE - 63C40, are equipped with a leakage protection 

function. Please note that the model suffix "LE" indicates the presence of this function.

#### 5. Price Reference

- **Non - leakage Protection Type**: Approximately 12 - 15 yuan per unit.

- **Leakage Protection Type (e.g., NXBLE - 63C40)**: Approximately 20 - 65 yuan per unit. The price may vary 

depending on the purchasing channel and product specifications.

#### 6. Precautions

- **Authenticity Verification**: It is recommended to purchase the product through authorized channels. Check 

the packaging, anti - counterfeiting labels, and the quality of the product, such as the material of the contacts

 and the texture of the housing.

- **Installation Requirements**: Installation should be carried out by a professional electrician. Ensure correct

 wiring and avoid overloading the circuit breaker.

- **Model Selection**: Select the appropriate rated current according to the total load of the electrical system. 

A 40A circuit breaker is suitable for medium - load applications, such as multiple air conditioners and kitchen appliances.

#### 7. Application Examples

- **Residential Use**: Can be used as the main switch in a household distribution box or for protecting the branch

 circuits of high - power electrical appliances such as air conditioners and electric water heaters.

- **Commercial Use**: Suitable for small - scale commercial premises for power distribution protection.

If you need the leakage protection function, please choose a model with the "LE" suffix (e.g., NXBLE - 63C40). Pay 

attention to the leakage operating current (usually 30mA) and the operating time (≤0.1 seconds).