NXB-125 Moulded Case Circuit Breaker

NXB-125-125A-1P-MCB-2

NXB-125-125A-1P-MCB-Front-5

NXB-125-125A-2P-MCB-2

NXB-125-125A-2P-MCB-Front-5

NXB-125-125A-3P-MCB-2

NXB-125-125A-3P-MCB-Front-5

NXB-125-125A-4P-MCB-2

NXB-125-125A-4P-MCB-Front-5

NXB-125-MCB-Side-2

NXB-125-125A-1P-MCB-2

NXB-125-125A-1P-MCB-Front-5

NXB-125-125A-2P-MCB-2

NXB-125-125A-2P-MCB-Front-5

NXB-125-125A-3P-MCB-2

NXB-125-125A-3P-MCB-Front-5

NXB-125-125A-4P-MCB-2

NXB-125-125A-4P-MCB-Front-5

NXB-125-MCB-Side-2

NXB-125 Moulded Case Circuit Breaker

The NXB-125 Moulded Case Circuit Breaker (MCCB) by CHINT offers advanced overload, short-circuit, and isolation protection for both AC and DC applications. Built to IEC/EN 60947-2 standards, it provides reliable performance across 230/400V AC and up to 220V DC systems. With rated currents from 63A to 125A, breaking capacity up to 20kA, and C or D tripping curves, the NXB-125 ensures efficient circuit protection and long service life for residential, commercial, and industrial environments.

Product Information

Function: Automatically disconnects during abnormal voltage (over/under) and restores after recovery
Rated Voltage (Ue): AC 230V, 50Hz
Rated Operating Current (Ie): 32A, 40A, 50A, 63A, 80A
Number of Poles: 1P+N, 3P+N
Overvoltage Cutoff Value: 275V
Undervoltage Cutoff Value: 161V
Recovery Voltage Range: 196V–253V
Voltage Protection Range: 0–450V
Time Delay for Reconnection: 30 ±10 seconds
Impulse Withstand Voltage: 4kV (Category III equipment safety standard)
Mechanical/Electrical Life: >50,000 operations
Power Consumption: <2W
Ambient Temperature: −35°C to +70°C
Altitude: ≤3000m
Relative Humidity: ≤50% at +40°C, up to 90% at +20°C
Pollution Degree: 2
Mounting Category: II or III
Mounting Type: TH35-7.5 DIN rail (vertical deviation ≤5°)
Connection Method:
- Bottom entry and upper/bottom exit wiring
- Neutral (N) and Live (L) connections must not be reversed
Conductor Capacity:
- 32A → 6mm²
- 40A → 10mm²
- 50A → 10mm²
- 63A → 16mm²
- 80A → 25mm²
LED Indication:
- Green = Normal voltage
- Red = Overvoltage/Undervoltage fault
Dimensions (mm): 81 × 42.5 × 27 (H×W×D)
Installation Tip: Tighten terminal screws before use to prevent contact failure

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NXB-125-MCCB-Catalog.pdf

905.9KB

2025-12-04

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2004-NXB-125-MCCB-Manual EN.pdf

257.9KB

2024-09-22

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2004-NXB-125-MCCB-Manual.pdf

872.25KB

2024-09-22

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2403-NXB-125-MCCB-CE LVD Certificate.pdf

1.94MB

2024-09-22

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2403-NXB-125-MCCB-TUV Certificate.pdf

2.02MB

2024-09-22

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2311-NXB-125-MCCB-Carbon Footprint Certificate.pdf

540.68KB

2024-09-22

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2211-NXB-125-MCCB-SAA Certificate.pdf

909.64KB

2024-09-22

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2209-NXB-125-MCCB-REACH Declaration Certificate.pdf

1.23MB

2024-09-22

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2207-NXB-125-MCCB-TUV Certificate.pdf

984.29KB

2024-09-22

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2206-NXB-125-MCCB-EAC Certificate.pdf

617.97KB

2024-09-22

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2205-NXB-125-MCCB-CE Certificate.pdf

449.4KB

2024-09-22

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2204-NXB-125-MCCB-SEMKO Certificate.pdf

571.81KB

2024-09-22

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2204-NXB-125-MCCB-CB Certificate.pdf

214.73KB

2025-08-19

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2109-NXB-125-MCCB-UKCA Certificate.pdf

420.73KB

2024-09-22

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2011-NXB-125-MCCB-CE RoHS Declaration Certificate.pdf

492.5KB

2024-09-22

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NXB-125-MCCB-Drawing-1P-3D.x_t

6.14MB

2024-09-22

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NXB-125-MCCB-Drawing-3P-3D.x_t

18.4MB

2024-09-22

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NXB-125-MCCB-Drawing-4P-3D.x_t

24.49MB

2024-09-22

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NXB-125-MCCB-Drawing-2P-3D.x_t

2024-09-22

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FAQs

What is the purpose of the OUVR-2 Self-recovery Overvoltage and Undervoltage Protector?

It safeguards equipment by disconnecting power during unsafe voltage conditions (over or under) and automatically restoring it once the voltage stabilizes, ensuring continuous and safe operation.

Where is the OUVR-2 typically used?

It’s ideal for household distribution boxes, small commercial systems, or industrial control panels requiring stable power supply and unattended recovery.

How does the LED indication system work?

The green LED signals normal voltage, while the red LED lights up during overvoltage or undervoltage events, providing a quick status overview.

How long does it take to recover after a voltage fault?

The device reconnects automatically after 30 ±10 seconds once the voltage returns to the safe range (196V–253V).

What makes the OUVR-2 reliable?

Its inverse time-lag operation (<1s), 50,000-cycle lifespan, and 4kV surge withstand capability make it a durable, low-maintenance choice for reliable power protection.