Chint NXBLE-63 3P+N C40A Residual Current Operated Circuit Breaker

Chint NXBLE-63 3P+N C40A Residual Current Operated Circuit Breaker

Chint NXBLE-63 3P+N C40A is a residual current operated circuit breaker, mainly used for overload, short-circuit and leakage protection of electrical circuits.

– Pole Number: 3P+N, namely three poles plus neutral wire, which can control three phase wires and one neutral wire simultaneously.

– Rated Current: 40あ, indicating that the maximum current the circuit breaker can carry for long-term stable operation is 40A.

– Residual Current: Usually 30mA. When the leakage current in the circuit reaches or exceeds this value, the circuit breaker will trip automatically.

– Breaking Capacity: 6の, meaning it can quickly cut off the circuit when the short-circuit current reaches 6kA, thus protecting the safety of equipment and personnel.

– Leakage Protection Type: Type AC, suitable for leakage protection in alternating current circuits.

– Residual Current Release Type: Electronic type, which detects leakage signals through electronic components and triggers the tripping mechanism.

– Rated Voltage: 400VAC, applicable to AC circuits with a rated voltage of 400V.

– 機能的な特徴: It has overload, short-circuit and residual current operation protection functions. It complies with standards such as GB/T 16917.1 and IEC 61009-1, and has obtained CCC certification, which can effectively ensure circuit safety.

– Appearance and Installation: It features a white plastic shell and a blue operating handle, with a compact size. It can be installed on standard guide rails, facilitating installation and wiring in distribution boxes.

Installation and Operation Instructions for Chint NXBLE-63 3P+N C40A Residual Current Operated Circuit Breaker

Chint NXBLE-63 3P+N C40A is an electronic residual current operated circuit breaker, integrating triple protection functions of overload, short-circuit and leakage protection. It is suitable for 400VAC three-phase four-wire distribution circuits. The following are standardized specifications for installation, wiring, operation and maintenance.

Pre-installation Preparation
Check Product Status

Confirm that the circuit breaker model is NXBLE-63 3P+N C40A, and verify that the nameplate parameters (rated voltage 400VAC, rated current 40A, rated residual operating current 30mA, breaking capacity 6kA) match the application scenario.

Check that the shell is free from damage, 操作ハンドルは柔軟です (with clear “ON”, “OFF” そして “テスト” marks), and the wiring terminals are free from oxidation.

Verify the CCC certification mark to ensure the product is genuine.

Confirm Installation Environment

Ambient temperature: -5℃～+40℃, with the average temperature not exceeding +35℃ within 24 hours.

高度: ≤2000m; derating is required if the altitude exceeds this limit.

Humidity requirement: Relative air humidity ≤90% (at 25℃), free from condensation, corrosive gases and dust accumulation.

Installation location: Avoid severe vibration, direct sunlight and stay away from strong magnetic field interference sources.

Prepare Tools and Accessories

ツール: Phillips screwdriver, wire stripper, torque wrench, voltage tester pen.

Accessories: Standard 35mm DIN guide rail (the circuit breaker is equipped with guide rail mounting clips as standard), copper wiring terminals (it is recommended to use those suitable for 10-25mm² wires).

Installation and Wiring Steps
Guide Rail Installation

– This circuit breaker adopts 35mm DIN standard guide rail clamping installation, requiring no additional fixing screws.

– Operation method: Align the clamping clips on the back of the circuit breaker with the guide rail, press down and push forward until the clamping clips are fully locked on the guide rail; press the clip release button to remove the circuit breaker during disassembly.

– Installation spacing: Reserve a space of ≥5mm on both sides of the circuit breaker to ensure heat dissipation and wiring operation.

Wiring Specifications (Core Focus)

The neutral pole (N pole) of NXBLE-63 3P+N cannot be disconnected. During wiring, strictly distinguish between phase wire and neutral wire terminals, and reverse connection is strictly prohibited.

Terminal Mark	Wiring Type	Conductor Specification (Copper Core)	Tightening Torque
L1/L2/L3	Three-phase Phase Wires	10-25mm	2.5-3N*m
N	Neutral Wire	10-25mm	2.5-3N*m
Load-side Terminals	Outlet Circuit	Same as Inlet Specification	Same as Inlet Torque

– Wiring Steps

Power-off and Voltage Testing: Ensure that there is no voltage in the incoming circuit to avoid live wiring.
Wire Stripping: Strip about 8-10mm of the wire insulation layer to expose the copper core without oxidation; it is recommended to install cold-pressed terminals to prevent wire loosening.
Inlet Direction: Top-in and bottom-out (recommended) or bottom-in and top-out are both acceptable, but the wiring direction must be unified in the same power distribution system.
Terminal Tightening: Tighten the wiring terminal screws with a screwdriver to ensure the wires are not loose; check the torque with a torque wrench to prevent over-loosening (which may cause heating) or over-tightening (which may damage the terminals).
Neutral Wire Notes: The N pole must be connected to the neutral wire and cannot be left unconnected; it is strictly prohibited to connect phase wires to the N terminal, otherwise the leakage protection function will fail.

– Prohibited Operations

– It is strictly prohibited to use the 3P+N circuit breaker in three-phase three-wire circuits (scenarios without neutral wire).

– It is strictly prohibited to connect multiple strands of wires to the terminals (without installing terminal blocks).

– It is strictly prohibited to share the neutral wire on the outlet side of the residual current circuit breaker with neutral wires of other circuits.

Ⅲ. Operation Method

Closing and Opening Operations

– Closing: Flip the operating handle upward to the “ON” position to put the circuit breaker into operation; if the handle is in the middle position (tripped state), flip it downward to the “OFF” position first, then flip it upward to close the circuit breaker.

– Opening: Flip the handle downward to the “OFF” position to manually cut off the circuit.

– Leakage Test: After closing the circuit breaker, press the “テスト” button on the panel; the circuit breaker should trip immediately (the handle bounces to the middle position), indicating that the leakage protection function is normal; it is recommended to perform the test once a month.

Trip Fault Troubleshooting

After the circuit breaker trips, troubleshoot the cause before closing it again; do not close it blindly.

Trip Phenomenon	Possible Causes	Troubleshooting Methods
Trips when the TEST button is pressed	Normal leakage protection test	Close the circuit breaker directly
Trips immediately after closing	1. Leakage in the line or load	1. Test the line insulation resistance with a megohmmeter
	2. Reverse connection of phase wire and neutral wire	2. Verify the marks of the wiring terminals
	3. Repeated grounding of the neutral wire	3. Remove redundant grounding points of the neutral wire
Trips during load operation	1. Load current exceeds 40A (overload)	1. Reduce the load or replace the circuit breaker with a larger rated current
	2. Line short circuit	2. Troubleshoot the short-circuit point (例えば, damaged wire insulation)
	3. Excessive leakage current	3. Test the leakage status of the equipment

Daily Operation Notes

– After the circuit breaker trips, eliminate the fault before closing it again to avoid expanding the fault due to repeated closing.

– It is forbidden to connect other electrical components (such as fuses) in parallel or series with the circuit breaker terminals.

– Do not connect equipment with large harmonics (such as frequency converters and electric welders) to the load side; さもないと, a Type A residual current circuit breaker should be selected.

Maintenance and Upkeep
Regular Inspection

Monthly: Press the TEST button to test the leakage protection function to ensure reliable operation.

Quarterly: Clean the dust on the surface of the circuit breaker, and check whether the wiring terminals have heating discoloration or loose screws.

Annually: Test the insulation resistance between the incoming and outgoing lines of the circuit breaker with a megohmmeter (disconnect all loads; the insulation resistance ≥1MΩ is qualified).

Fault Handling

If the circuit breaker does not trip when the TEST button is pressed, it indicates that the leakage protection function has failed; replace the circuit breaker immediately and do not continue to use it.

If the shell is cracked or the terminals are ablated, replace the product in a timely manner; do not reuse it after repair.

Safety Warnings
Installation, wiring and maintenance must be operated by certified electricians, and the power-off, voltage testing, grounding and tagging system must be strictly followed.
Before putting the circuit breaker into operation, confirm that all loads are disconnected to avoid arc generation caused by closing with load.
The residual current operated circuit breaker cannot replace grounding protection; the power distribution system must meet the grounding specification requirements at the same time.