​Chint NXBLE32-3PC32 Residual Current Operated Circuit Breaker

Chint NXBLE32-3PC32 is a Residual Current Operated Circuit Breaker with Overcurrent Protection (RCBO) suitable for three-phase circuits. It integrates overload, short-circuit, and residual current protection functions, and is mainly used for safety protection in terminal power distribution systems.

 Core Parameters and Functions

1. Rated Current and Pole Number

- **Rated Current (In)**: 32A, applicable to circuits where the total current of three-phase loads does not exceed 32A (such as small commercial equipment, motors, etc.).

- **Pole Number**: 3P (three-phase three-wire). It can disconnect three phase wires simultaneously, and is suitable for three-phase systems without a neutral wire or scenarios that require disconnecting three-phase power supplies.

2. Tripping Characteristic

- **Curve Type C**: Suitable for conventional resistive loads (such as lighting, heating equipment). It can trip quickly when the current reaches 5-10 times the rated current, preventing circuit damage caused by overload.

3. Residual Current Protection Function

- **Rated Residual Operating Current (IΔn)**: 30mA (default value). When the residual current reaches 30mA, the circuit breaker will cut off the power supply within 0.1 seconds, effectively preventing electric shock and electrical fires.

- **Residual Current Protection Type**: Type AC. It can detect power-frequency sinusoidal AC residual current and is suitable for common household and industrial equipment.

4. Breaking Capacity and Voltage Level

- **Rated Short-Circuit Breaking Capacity (Icu)**: 6kA. It can reliably break the circuit when the short-circuit current is as high as 6000A, protecting the circuit from severe damage.

- **Rated Voltage**: 400V AC (three-phase), which conforms to the standard voltage of domestic three-phase power distribution systems.

 Design and Installation

1. Structure and Dimensions

- **Overall Dimensions**: Width 45mm (for 3P), depth 76.8mm, height 94.5mm. It adopts standard 35mm DIN rail mounting, saving space in the distribution box.

- **Wiring Method**: Incoming wires can be connected from both the top and bottom. It supports wires with a maximum cross-sectional area of 25mm². The torque of the terminal blocks must be operated in accordance with standards (refer to the instruction manual for recommendations).

2. Environmental Adaptability

- **Operating Temperature**: -35℃ to +70℃, adaptable to a wide range of environmental temperatures.

- **Protection Level**: IP20 (for direct installation) or IP40 (for installation inside distribution boxes), preventing the intrusion of foreign objects.

3. Certifications and Standards

- It complies with China's CCC certification and the international IEC 61009-1 standard, and has passed CQC test verification, ensuring reliable quality.

 Application Scenarios

- **Three-Phase Motor Protection**: Used for equipment such as small water pumps and compressors to prevent equipment damage and safety accidents caused by overload, short circuit, and residual current.

- **Commercial and Industrial Power Distribution**: Applied in three-phase power supply systems of places like restaurants and small factories to provide comprehensive circuit protection.

- **Temporary Power Supply Facilities**: Suitable for scenarios requiring mobile power supply such as construction sites and event venues to ensure electricity safety.

Selection and Precautions

1. Current Matching

- Select the rated current according to the total load current to avoid overload. If multiple devices are connected in parallel, the derating factor should be considered (for example, when more than 9 devices are installed side by side, the current should be derated to 0.76In).

2. Selection of Residual Operating Current

- 30mA is suitable for direct contact protection (such as human electric shock). If higher sensitivity is required, a 10mA model can be considered (but it is necessary to confirm whether the load allows this).

3. Alternative Models and Compatibility

- If neutral wire protection is required, a 3P+N model (such as NXBLE32-3P+NC32) can be selected; if the load current is larger, it can be upgraded to the NXBLE63 series (with a frame current of 63A).

4. Price and Purchase Channels

- The price of a single unit is approximately 80-120 RMB.

Installation and Maintenance

1. Installation Steps

- Turn off the upper-level power supply, clamp the circuit breaker onto the 35mm DIN rail, and connect the three-phase incoming and outgoing wires according to the marks to ensure firm wiring.

- Before closing the switch, test the residual current protection function: press the test button (marked "T"), and the circuit breaker should trip immediately.

2. Regular Inspection

- Operate the test button once a month to check whether the residual current protection function works normally.

- Regularly clean the dust on the surface of the circuit breaker and check whether the terminal blocks are loose.

Summary

Chint NXBLE32-3PC32 is a cost-effective three-phase RCBO with balanced parameter configuration, suitable for various industrial and commercial scenarios. Its 30mA residual current protection, Type C tripping characteristic, and 6kA breaking capacity can effectively ensure circuit safety. During selection and installation, reasonable configuration should be made according to the actual load requirements and the structure of the power distribution system, and electrical installation specifications should be followed.