Chint RCCB NXBLE63-4PC40

Chint NXBLE63-4PC40 is a residual current circuit breaker (RCCB) suitable for three-phase four-wire circuits. It is mainly used in residential, commercial, and small industrial power distribution systems to provide overload, short-circuit, and residual current protection.

 I. Basic Specifications

 1. Model Interpretation

- NXBLE: Indicates the Chint NXB series residual current circuit breaker.

- 63: Frame current rating is 63A, meaning the maximum rated current of the circuit breaker is 63A.

- 4P: Four-pole design, which can disconnect three-phase live wires (L1/L2/L3) and the neutral wire (N) simultaneously, suitable for three-phase four-wire circuits.

- C40: Rated current is 40A, with a C-type tripping characteristic (suitable for conventional resistive loads such as lighting and household appliances).

 2. Electrical Parameters

- Rated Voltage: 400V AC (suitable for three-phase systems).

- Breaking Capacity: 6kA (the maximum short-circuit current that can be safely interrupted at the rated voltage).

- Residual Current Protection Characteristics:

  - Residual operating current: 30mA (a safety threshold for the human body, which can quickly cut off the circuit to prevent electric shock).

  - Residual current protection type: AC type, which mainly detects power-frequency sinusoidal AC leakage and is suitable for common residential and commercial environments.

 3. Certifications and Standards

- Complies with GB/T 16917.1 (Chinese standard) and IEC 61009-1 (international standard), and has passed the CCC certification to ensure product safety and reliability.

 II. Core Functions

 1. Overload Protection

When the circuit current exceeds the rated current (40A), the circuit breaker will automatically trip within a certain time (related to the degree of overload) to prevent line overheating and fire hazards.

 2. Short-Circuit Protection

When a short-circuit fault occurs in the circuit (current increases sharply), the circuit breaker can cut off the circuit in an extremely short time (usually less than 0.1 seconds) to prevent equipment damage and electrical accidents.

 3. Residual Current Protection

It detects the leakage current in the circuit through a built-in zero-sequence current transformer. When the leakage current reaches 30mA, the circuit breaker acts quickly (tripping time ≤ 0.1 seconds) to effectively protect personnel from electric shock.

 4. Isolation Function

After the circuit breaker is disconnected, it can provide a visible disconnection point to ensure safety during maintenance.

 III. Installation and Dimensions

 1. Installation Method

It adopts a standard 35mm DIN rail installation, compatible with most distribution boxes, featuring easy installation and space-saving.

 2. Overall Dimensions

- Width: 18 modules (approximately 90mm). The four-pole design occupies 18 standard module positions in the distribution box.

- Height and Depth: Refer to official drawings (such as the NXBLE-63 4P outline drawing). The overall size is compact and suitable for common distribution box specifications.

 IV. Application Scenarios

 1. Residential Power Distribution

Used as the main incoming switch for three-phase four-wire households, it protects household appliances and personal safety, especially suitable for circuits with concentrated high-power appliances.

 2. Commercial and Small Industrial Use

Used for three-phase power incoming protection in scenarios such as stores and small processing plants. It can control three-phase equipment and neutral wire circuits simultaneously to ensure stable system operation.

 3. Temporary Power Supply

Suitable for scenarios requiring mobile or temporary power supply, such as construction sites and temporary event venues, providing comprehensive electrical protection.

 V. Selection and Precautions

 1. Model Matching

- Confirm that the rated current of the circuit (40A) matches the total power of the load to avoid overload.

- If the load includes a large number of inductive equipment (such as motors), it is recommended to select a circuit breaker with D-type tripping characteristic (D curve).

 2. Residual Current Protection Type

AC-type residual current circuit breakers are suitable for conventional environments. If detection of pulsating DC or high-frequency leakage (such as in frequency conversion equipment) is required, Type A or Type B products should be selected. However, only the AC type is available for the 4PC40 model in the NXBLE63 series.

 3. Price and Purchase Channels

- The reference market price is approximately 120-130 RMB per unit (promotional price on e-commerce platforms). The specific price varies depending on the purchase quantity and channel.

- It is recommended to purchase via Chint WhatsApp: 0086-13811255435 to avoid counterfeit products.

 4. Alternative Models

If higher breaking capacity (such as 10kA) is required, an upgrade to the Chint NXBLE-63H series can be considered, but it is necessary to confirm whether the distribution box space is compatible.

 VI. Maintenance and Replacement

 1. Regular Testing

Use the "TEST" button on the circuit breaker to test the residual current protection function once a month to ensure its normal operation.

 2. Replacement Recommendations

The service life of the circuit breaker is usually 10-15 years. If difficulties in closing, contact ablation, or frequent misoperation occur, it should be replaced in a timely manner.

 Summary

With its stable performance, comprehensive protection functions, and compact design, Chint NXBLE63-4PC40 has become an ideal choice for three-phase four-wire circuits. Before installation, carefully check the circuit parameters and follow the electrical installation specifications to ensure safe and reliable operation of the system. For special loads or complex environmental requirements, it is recommended to consult a professional electrician for optimized model selection.

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