Chint NXB63-1P/D10 miniature circuit breaker

Chint NXB63-1P/D10 is a disyuntor miniatura suitable for residential, industrial, and commercial scenarios. It is mainly used for overload protection, protección contra cortocircuitos, 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**, como motores, transformers, and solenoid valves. Its instantaneous tripping range is **10-20 times the rated current** (es decir., rapid tripping occurs when the current is 100-200A), which can effectively avoid false tripping during motor startup.

2. Rendimiento eléctrico

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

– **Breaking Capacity**: 6el (compliant with GB/T 10963.1 y CEI 60898-1 estándares), 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 operaciones, meeting the requirements of long-term use.

3. Certificaciones y estándares

– It has passed the CCC certification (Certificación obligatoria de China) and complies with the CE standard (for some export models), ensuring product quality and safety.

II. Escenarios de aplicación y recomendaciones de selección

1. Aplicaciones típicas

– **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, bombas de agua, 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 (p.ej., hornos, calentadores de agua electricos), but it should be noted that in single-phase circuits, it needs to be used with a neutral terminal block.

2. Notas de selección

– **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). Sin embargo, the terminal design of the NXB series is more compact and can accommodate thicker wires (p.ej., 4mm²).

III. Price and Market Supply

1. Gama de precios

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

– plataformas de comercio electrónico (p.ej., 1688, Lichuang Mall): Aproximadamente 5-6 RMB por unidad.

– Offline distributors or brand flagship stores: Aproximadamente 15-20 RMB por unidad.

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

2. Inventory and Alternative Models

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

– **Alternative Solutions**: Para mayor capacidad de corte, the **NXB-63H 1P D10** (with a breaking capacity of 10kA and a price of approximately 10-15 RMB por unidad) se puede seleccionar; for leakage protection, it can be matched with the **NXBLE-63 series residual current circuit breaker** (p.ej., 1P+N C10 30mA).

IV. Installation and Usage Tips

1. Pasos de instalación

– 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. Recomendaciones de mantenimiento

– 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.

– Si se producen tropezones frecuentes, 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

Resumen

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. Para protección contra fugas, it is recommended to use it with the NXBLE series residual current circuit breaker.