Chint NXB63-1P/D10 miniature circuit breaker

Chint NXB63-1P/D10 is a miniature circuit breaker suitable for residential, industrial, and commercial scenarios. It is mainly used for overload protection, short-circuit protection, and isolation of electrical circuits. 

 I. Analysis of Core Parameters

 1. Model Meaning

- **NXB-63**: Series name, with a frame current of 63A, suitable for circuits with a rated current ≤ 63A.

- **1P**: Single-pole design, which only controls the live wire and occupies 1 module (18mm in width).

- **D10**: D-type tripping curve with a rated current of 10A. The D-type curve is applicable to **loads with high inrush current**, such as motors, transformers, and solenoid valves. Its instantaneous tripping range is **10-20 times the rated current** (i.e., rapid tripping occurs when the current is 100-200A), which can effectively avoid false tripping during motor startup.

2. Electrical Performance

- **Rated Voltage**: AC 230V (suitable for single-phase circuits).

- **Breaking Capacity**: 6kA (compliant with GB/T 10963.1 and IEC 60898-1 standards), capable of safely interrupting the circuit when the short-circuit current is ≤ 6kA.

- **Service Life**: Mechanical life of 20,000 operations and electrical life of 10,000 operations, meeting the requirements of long-term use.

 3. Certifications and Standards

- It has passed the CCC certification (China Compulsory Certification) and complies with the CE standard (for some export models), ensuring product quality and safety.

 II. Application Scenarios and Selection Recommendations

1. Typical Applications

- **Power Equipment Protection**: Such as small motors (power ≤ 2.2kW; a 10A circuit breaker is suitable for approximately a 2.2kW three-phase motor or a 1.5kW single-phase motor), air-conditioning compressors, water pumps, etc.

- **Industrial Control Circuits**: Protecting equipment prone to surge currents, such as solenoid valves and transformers.

- **Residential Power Distribution**: Can be used for branches of high-power electrical appliances (e.g., ovens, electric water heaters), but it should be noted that in single-phase circuits, it needs to be used with a neutral terminal block.

2. Selection Notes

- **Load Current Matching**: Ensure that the normal operating current of the circuit is ≤ 10A, and the peak starting current of the motor does not exceed the tripping curve range (100-200A).

- **Breaking Capacity Adaptation**: Select the breaking capacity according to the short-circuit current level at the installation location. If the short-circuit current may exceed 6kA, it is necessary to upgrade to the **NXB-63H series** (with a breaking capacity of 10kA).

- **Installation Compatibility**: The NXB-63 series is compatible with the DZ47 series in terms of DIN rail installation dimensions (18mm per pole). However, the terminal design of the NXB series is more compact and can accommodate thicker wires (e.g., 4mm²).

III. Price and Market Supply

1. Price Range

- The retail price per unit is approximately **5-20 RMB**, which varies depending on the procurement channel:

  - E-commerce platforms (e.g., 1688, Lichuang Mall): Approximately 5-6 RMB per unit.

  - Offline distributors or brand flagship stores: Approximately 15-20 RMB per unit.

- Discounts are available for bulk purchases (e.g., a box of 20 units), and the unit price can be reduced to 4-5 RMB.

2. Inventory and Alternative Models

- **Inventory Status**: In 2025, the market supply is sufficient, and mainstream platforms have spot goods available.

- **Alternative Solutions**: For higher breaking capacity, the **NXB-63H 1P D10** (with a breaking capacity of 10kA and a price of approximately 10-15 RMB per unit) can be selected; for leakage protection, it can be matched with the **NXBLE-63 series residual current circuit breaker** (e.g., 1P+N C10 30mA).

 IV. Installation and Usage Tips

1. Installation Steps

- Ensure operation is performed after power-off. Clip the circuit breaker onto the 35mm standard DIN rail and tighten the terminal blocks (it is recommended to use a screwdriver with a torque ≤ 0.5N·m).

- A single-pole circuit breaker only controls the live wire; the neutral wire must be connected through a neutral terminal block to prevent electrical appliances from being charged due to neutral wire disconnection.

2. Maintenance Recommendations

- Regularly check for signs of oxidation or overheating on the contacts, and operate the circuit breaker 2-3 times a year to maintain mechanical flexibility.

- If frequent tripping occurs, it is necessary to check whether the load is overloaded, or if there is a line short-circuit or ground fault.

3. Safety Precautions

- Replacing the circuit breaker while it is energized is strictly prohibited; the operation must be performed by a professional electrician.

- Avoid installation in humid environments; if outdoor use is required, a supporting waterproof distribution box must be used.

 V. Comparison with Competitors

Summary

With its high cost-effectiveness, reliable D-type tripping protection, and wide compatibility, the Chint NXB63-1P/D10 has become the preferred choice for power circuit protection. During selection, the breaking capacity should be reasonably chosen based on load characteristics and short-circuit current, and attention should be paid to installation specifications to ensure safety. For leakage protection, it is recommended to use it with the NXBLE series residual current circuit breaker.