Chint NBX-63C40 circuit breaker
The Chint NBX-63C40 circuit breaker is a small-sized circuit breaker, mainly used for overload and short-circuit
protection in household or small-sized power distribution systems. The following is the collation of key information:
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### 1. **Meaning of the Model**
- **NBX-63**: The frame current is 63A, indicating that the maximum carrying current of this circuit breaker is 63A.
- **C40**: The rated current is 40A, and it has a C-type tripping curve (suitable for conventional scenarios such as
lighting and resistive loads).
### 2. **Main Parameters**
- **Number of Poles**: Commonly 2P (single-phase, controlling the live wire and the neutral wire).
- **Interrupting Capacity**: Approximately 6kA (some models may indicate a higher interrupting capacity).
- **Rated Voltage**: 220V (for household use) or 380V (three-phase).
- **Application Scenarios**: Household distribution boxes, lighting circuits, protection of small electrical appliances.
### 3. **Functional Features**
- **Overload Protection**: When the current exceeds 40A, the circuit breaker will trip within a certain period of time.
- **Short-circuit Protection**: Immediately disconnects the circuit in case of an instantaneous large current.
- **Leakage Protection**: Some models (such as NXBLE-63C40) have a leakage protection function. Pay attention to
whether the model suffix contains "LE".
### 4. **Price Reference**
- Ordinary type (without leakage protection): Approximately 12-15 yuan per piece.
- Leakage protection type (such as NXBLE-63C40): Approximately 20-65 yuan per piece (the price difference is related
to the channel and capacity).
### 5. **Precautions**
- **Authenticity Identification**: It is recommended to purchase through formal channels, and check the packaging,
anti-counterfeiting marks, and product workmanship (such as the material of the contacts and the texture of the shell).
- **Installation Specifications**: It needs to be operated by a professional electrician to ensure correct wiring and avoid
overloading.
- **Model Selection and Matching**: Select an appropriate rated current according to the total household load. 40A is
suitable for medium loads (such as multiple air conditioners, kitchen appliances, etc.).
### 6. **Examples of Application Scenarios**
- Protection of the main switch in households or the branch circuits of high-power electrical appliances (such as air
conditioners, electric water heaters).
- Power distribution protection in small commercial premises.
If the leakage protection function is required, select a model with the "LE" suffix (such as NXBLE-63C40), and pay attention
to the leakage operating current (usually 30mA) and the operating time (≤0.1 seconds).
