NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

NXB-125G Miniature Circuit Breaker

The CHINT NXB-125G Miniature Circuit Breaker provides advanced overload, short-circuit, and isolation protection for AC circuits up to 400 V and 125 A. With a high breaking capacity of 10 kA, multiple tripping curves (B, C, D, and OV), and a durable mechanical life of 20,000 operations, it ensures stable and safe circuit control. Built to IEC/EN 60898-1 standards, the NXB-125G delivers dependable performance in residential, commercial, and industrial power distribution environments.

Product Information

Standards Compliance: IEC/EN 60898-1
Certifications: CE, RoHS, REACH, Carbon Footprint compliant
Function: Overload protection, short-circuit protection, positive isolation
Rated Current (In): 63 A, 80 A, 100 A (1P, 2P, 3P, 4P), 125 A (1P, 2P)
Rated Voltage (Ue):
- 230 V~ for 1P
- 400 V~ for 2P, 3P, 4P
Rated Frequency: 50/60 Hz
Number of Poles: 1P, 2P, 3P, 4P
Rated Short-circuit Breaking Capacity (Icn): 10 kA
Rated Short-circuit Service Capacity (Ics): 7.5 kA
Rated Impulse Withstand Voltage (Uimp): 4 kV (1.2/50 μs)
Thermal-Magnetic Release Type:
- B Curve: 3–5 In (resistive loads)
- C Curve: 5–10 In (inductive loads)
- D Curve: 10–14 In (high inrush loads)
- OV Curve: 14–20 In (available only for 3P 80 A)
Mechanical Life: 20,000 cycles
Electrical Life:
- 6,000 cycles (In ≤ 100 A)
- 4,000 cycles (In > 100 A)
Power Consumption per Pole:
- 63 A – 5 W
- 80 A – 7 W
- 100 A – 10 W
- 125 A – 14 W
Temperature Derating (Reference: 30 °C):
- 1.43× at –35 °C
- 1.20× at 0 °C
- 1.00× at 30 °C
- 0.81× at 60 °C
- 0.74× at 70 °C
Operating Temperature: –35 °C to +70 °C
Storage Temperature: –35 °C to +85 °C
Applicable Altitude: ≤ 2000 m
Mounting Method: TH35-7.5 DIN rail mounting
Cable Entry: Top or bottom entry
Terminal Capacity:
- Min: 16 mm²
- Max: 50 mm²
Tightening Torque: 3.5 N·m (max 4 N·m)
Pollution Degree: 2
Protection Degree:
- IP20 (direct mounting)
- IP40 (in distribution box)
Compatible Accessories: AX-X3, AL-X3, SHT-X3, OVT-X3, UVT-X3, OUVT-X3
Dimensions (L × H, mm):
- 1P – 27.0 × 75.5
- 2P – 54.0 × 78.5
- 3P – 81.0 × 78.5
- 4P – 108.0 × 78.5

Name

Size

Release time

Operate

NXB-125G-MCB-Catalog.pdf

930.69KB

2025-12-04

Download

Name

Size

Release time

Operate

2004-NXB-125G-MCB-Manual.pdf

862KB

2024-09-22

Download

Name

Size

Release time

Operate

2403-NXB-125G-MCB-REACH Declaration Certificate.pdf

739.05KB

2024-09-22

Download

2402-NXB-125G-MCB-SIRIM Certificate.pdf

1.28MB

2024-09-22

Download

2311-NXB-125G-MCB-Carbon Footprint Certificate.pdf

540.95KB

2024-09-22

Download

2208-NXB-125G-MCB-Certificate.pdf

453.77KB

2024-09-22

Download

2206-NXB-125G-MCB-EAC Certificate.pdf

618.18KB

2024-09-22

Download

2104-NXB-125G-MCB-Intertek Certificate.pdf

445.66KB

2024-09-22

Download

2011-NXB-125G-MCB-CE Declaration Certificate.pdf

504.03KB

2024-09-22

Download

1604-NXB-125G-MCB-CB Certificate.jpg

1.01MB

2024-09-22

Download

Name

Size

Release time

Operate

NXB-125G -MCB-Drawing-1P-3D.stp

6.95MB

2024-09-22

Download

NXB-125G-MCB-Drawing-4P-3D.stp

16.87MB

2024-09-22

Download

NXB-125G-MCB-Drawing-3P-3D.stp

14.13MB

2024-09-22

Download

NXB-125G-MCB-Drawing-1P-2D.dwg

213.88KB

2024-09-22

Download

NXB-125G-MCB-Drawing-2P-3D.stp

9.86MB

2024-09-22

Download

NXB-125G-MCB-Drawing-4P-2D.dwg

297.14KB

2024-09-22

Download

NXB-125G-MCB-Drawing-3P-2D.dwg

273.99KB

2024-09-22

Download

NXB-125G-MCB-Drawing-2P-2D.dwg

250.05KB

2024-09-22

Download

Need Support From Us?

Blog

Blog

Find expert perspectives on the trends and technologies driving your business.

View Now

Download Center

Download Center

Download new and previously released documents including product document, solutions, cases, coporate report.

View Now

Contact Us

Reach out to us to receive more information, technical support, assistance with complaints and more.

Collapsed

Expand

FAQs

What protection functions does the NXB-125G offer?

It provides overload, short-circuit, and isolation protection, ensuring system safety and preventing damage from electrical faults

What applications is the NXB-125G suitable for?

It’s designed for industrial power distribution, commercial installations, and heavy-duty machinery, where high breaking capacity and reliability are critical

How many poles are available for the NXB-125G?

The breaker comes in 1P, 2P, 3P, and 4P configurations, supporting both single-phase and three-phase systems

What’s the difference between the tripping curves?

B Curve: Protects resistive loads (e.g., lighting).

C Curve: Protects mixed loads (motors, outlets).

D Curve: Handles high inrush currents (transformers, motors).

OV Curve: Specialized high inrush curve (3P, 80 A only).

How does it handle temperature variations?

The NXB-125G maintains rated performance up to 30 °C, with derating applied above that (e.g., 93% at 40 °C, 74% at 70 °C).