Chint Circuit Breaker NBH8-40 Series

IL Chint circuit breaker NBH840 series is a smallsized circuit breaker specifically designed for terminal power distribution in residential, commerciale, and industrial settings. The following is a detailed analysis of its core information:

1. Technical Parameters and Functional Features
2. Basic Parameters

Tensione nominale: AC 230V (suitable for singlephase circuits).

Corrente nominale: Ranging from 1A to 40A (such as 1A, 2UN, 3UN, 4UN, 6UN, 10UN, 16UN, 20UN, 25UN, 32UN, 40UN), soddisfare diversi requisiti di carico.

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

Interrupting Capacity:

NBH840: 4500UN (conventional type).

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

Caratteristiche di intervento: Type B (tripping at 35 volte la corrente nominale, suitable for resistive loads) and Type C (tripping at 510 volte la corrente nominale, suitable for inductive loads).

2. Safety Design

Twopole Cutting of Phase Wire + Neutral Wire: 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. Certificazioni e standard

Complies with GB/T 10963.1 (Chinese standard), IEC/EN 608981 (international standard), and has passed multiple certifications such as CCC, CE, SEMKO, VDE, ecc.

1. Scenari applicativi
2. Residential Power Distribution

Used for overload and shortcircuit protection of branches such as lighting, sockets, 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, hotels, and small factories, protecting lowpower equipment and circuits.

3. Ambienti speciali

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. Metodo di installazione

Rail Installation: Using the TH357.5 standard rail, it supports quick plugging and unplugging, saving space.

Requisiti di cablaggio:

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

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

2. Optional Accessories

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

Shunt Trip (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. Prezzo e canali di acquisto
2. Price Range

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 (Per esempio, the price of the NBH840H high interrupting type is slightly higher).

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

2. Purchase Channels

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.

Solution: 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.

Solution: 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. Service Life

The mechanical life is 10,000 volte, and the electrical life is 20,000 volte. Regularly check the wear condition of the contacts.

1. Alternative Models and Discontinuation Status

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

Discontinuation Status: 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. Precauzioni

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 (si consiglia di prenotare a 20% margine).

2. Specifiche di installazione

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, you can visit [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.