​Chint NXBLE32-3PC32 Residual Current Operated Circuit Breaker

Chint NXBLE323PC32 is a Residual Current Operated Circuit Breaker with Overcurrent Protection (RCBO) suitable for threephase circuits. It integrates overload, shortcircuit, 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 threephase loads does not exceed 32A (such as small commercial equipment, motors, etc.).

Pole Number: 3P (threephase threewire). It can disconnect three phase wires simultaneously, and is suitable for threephase systems without a neutral wire or scenarios that require disconnecting threephase 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 510 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 powerfrequency sinusoidal AC residual current and is suitable for common household and industrial equipment.

4. Breaking Capacity and Voltage Level

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

Rated Voltage: 400V AC (threephase), which conforms to the standard voltage of domestic threephase 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 crosssectional 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 610091 standard, and has passed CQC test verification, ensuring reliable quality.

Application Scenarios

ThreePhase 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 threephase 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 NXBLE323P+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 80120 RMB.

Installation and Maintenance

1. Installation Steps

Turn off the upperlevel power supply, clamp the circuit breaker onto the 35mm DIN rail, and connect the threephase 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 NXBLE323PC32 is a costeffective threephase 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.