Product Detail

NXB-125G Miniature Circuit Breaker

SKU:NXB-125G

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

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.