Chint Circuit Breaker NBH8-40 Series

El Chint circuit breaker NBH840 series is a smallsized circuit breaker specifically designed for terminal power distribution in residential, comercial, and industrial settings. El siguiente es un análisis detallado de su información principal.:

1. Technical Parameters and Functional Features
2. Parámetros básicos

Tensión nominal: CA 230 V (suitable for singlephase circuits).

Corriente nominal: Ranging from 1A to 40A (such as 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A), meeting different load requirements.

Number of Poles: 1P+N (cutting off the phase wire and the neutral wire simultaneously), enhancing safety.

Interrupting Capacity:

NBH840: 4500A (conventional type).

NBH840H: 6000A (high interrupting type), suitable for scenarios with high shortcircuit currents.

Características de disparo: Type B (tripping at 35 veces la corriente nominal, suitable for resistive loads) and Type C (tripping at 510 veces la corriente nominal, suitable for inductive loads).

2. Diseño de seguridad

Twopole Cutting of Phase Wire + Cable neutro: Avoids the risk of electric shock caused by incorrect wiring or potential shift of the neutral wire.

Energystorage Operating Mechanism: The closing speed of the contacts is not affected by manual operation, reducing arc burning and extending the service life.

High Protection Level: IP20 protection prevents the intrusion of foreign objects.

3. Certificaciones y estándares

Cumple con GB/T 10963.1 (estándar chino), IEC/EN 608981 (estándar internacional), and has passed multiple certifications such as CCC, CE, SEMKO, VDE, etc..

1. Escenarios de aplicación
2. Distribución de energía residencial

Used for overload and shortcircuit protection of branches such as lighting, enchufes, and air conditioners to ensure the safety of household electricity use.

2. Commercial and Industrial Applications

Suitable for terminal power distribution in places such as office buildings, hoteles, and small factories, protecting lowpower equipment and circuits.

3. Ambientes Especiales

The operating temperature range is from 5°C to +40°C, with a pollution degree of Level 2, and it can operate stably in ordinary environments.

When the altitude is ≤ 2000m, there is no need to derate. When it exceeds this height, refer to Chint’s official derating factor table.

III. Installation and Accessories

1. Método de instalación

Instalación de rieles: Using the TH357.5 standard rail, it supports quick plugging and unplugging, saving space.

Requisitos de cableado:

The crosssectional area of the copper wire needs to match the current specification (Por ejemplo, 16A corresponds to 1.5mm², and 40A corresponds to 6mm²).

The tightening torque is 1.5N·m to ensure reliable contact.

2. Optional Accessories

Contacto auxiliar (XF9): Used for remote signal indication (such as the status feedback of the circuit breaker).

Viaje de derivación (S9): Supports remote control of opening (requires an external 24V power supply).

Undervoltage Release (V9): Automatically cuts off the circuit when the voltage is abnormal.

1. Precio y canales de compra
2. Gama de precios

The price of a singlepole (1P+N) circuit breaker is approximately [incorrect price data here]. The specific price depends on the current specification and interrupting capacity (Por ejemplo, the price of the NBH840H high interrupting type is slightly higher).

There may be discounts for bulk purchases or through dealer channels.

2. Canales de compra

Online Platforms: [Incorrect information here]

1. Common Problems and Maintenance
2. Frequent Tripping of the Circuit Breaker

Cause: The load current exceeds the rated value, the circuit is shortcircuited, or the wiring is loose.

Solución: Check the load power, troubleshoot the shortcircuit point, and tighten the wiring terminals.

2. Inability to Close the Circuit Breaker

Cause: There is still a short circuit in the circuit, or the tripping mechanism has not been reset.

Solución: Eliminate the shortcircuit fault and manually reset the tripping handle.

3. Accessory Compatibility

Some accessories (such as the S9 shunt trip) need to match the circuit breaker model. It is recommended to consult the supplier or refer to the manual.

4. Vida útil

The mechanical life is 10,000 veces, y la vida eléctrica es 20,000 veces. Comprobar periódicamente el estado de desgaste de los contactos..

1. Alternative Models and Discontinuation Status

Modelos alternativos: Chint mainly promotes the NXB series (such as NXB40), which has a higher interrupting capacity (6el), and its size is compatible with the NBH840, and it can be directly replaced.

Estado de discontinuación: The NBH840 series is still available from some dealers, but Chint’s official website has gradually reduced the promotion of this series. It is recommended to give priority to the NXB series to ensure longterm support.

VII. Precauciones

1. Model Selection Suggestions

Select the Type B or Type C tripping characteristics according to the load type (resistive/inductive).

The rated current should be greater than the maximum load current (se recomienda reservar un 20% margen).

2. Especificaciones de instalación

Installed by a professional electrician to ensure correct wiring and firm fixing of the rail.

Avoid using it in humid and corrosive environments.

3. Safety Tips

Cut off the power supply before maintenance to prevent electric shock.

Regularly check the status of the circuit breaker and replace aging components in a timely manner.

For further information, puedes visitar [Chint Electric’s official website] or contact the customer service to obtain the product manual and information of authorized dealers.

Please note that the content in the original text with incorrect or unclear information (such as the incorrect price data and the wrong online platform information) has been noted in the translation. You may need to correct and supplement this information for a more accurate description.