NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

NB7 Miniature Circuit Breaker

The NB7 Miniature Circuit Breaker (MCB) by CHINT is designed for overload and short-circuit protection in AC circuits up to 240/415V with rated currents up to 63A. Built to comply with IEC 60898-1, it provides reliable circuit isolation and non-frequent switching. With B, C, and D tripping curves and a breaking capacity of up to 6kA, the NB7 ensures dependable protection in industrial, commercial, and residential installations.

Product Information

Standard Compliance: IEC 60898-1
Function: Overload and short-circuit protection; circuit switching and isolation
Rated Frequency: 50Hz / 60Hz
Rated Voltage (Ue):
- 1P: 240V / 415V AC
- 2P, 3P, 4P: 415V AC
Rated Current (In): 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A
Tripping Characteristics:
- Type B (3–5 In) – for resistive loads such as lighting and heating
- Type C (5–10 In) – for inductive loads such as motors
- Type D (10–16 In) – for high inrush current circuits like transformers or discharge lamps
Rated Short-Circuit Capacity (Icn):
- 6kA for 1–40A (B, C types)
- 4.5kA for 50–63A (B, C, D types)
Number of Poles: 1P, 2P, 3P, 4P
Mechanical Life: ≥10,000 operations
Electrical Life: ≥4,000 operations
Wiring Capacity: Suitable for copper conductors up to 25mm²
Terminal Type: Screw terminal with hold-down torque of 2 N·m
Recommended Wire Size:
- 1–6A → 1 mm²
- 10A → 1.5 mm²
- 16–20A → 2.5 mm²
- 25A → 4 mm²
- 32A → 6 mm²
- 40–50A → 10 mm²
- 63A → 16 mm²
Mounting: DIN rail (35mm)
Dimensions:
- Height: 81.5mm
- Width (per pole): 18mm
- Depth: 72mm (1P) / 80mm (multi-pole)
Connection Direction: Top or bottom feed
Operating Environment: Industrial, commercial, and residential applications

Name

Size

Release time

Operate

NB7-MCB-Catalog.pdf

331.71KB

2025-12-04

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Name

Size

Release time

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2004-NB7-MCB-Manual EN.pdf

143.32KB

2024-09-22

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2004-NB7-MCB-Manual.pdf

581.44KB

2024-09-22

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Name

Size

Release time

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2305-NB7-MCB-SLS Certificate.pdf

3.16MB

2024-09-22

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2201-NB7-MCB-CE Certificate.pdf

453.38KB

2024-09-22

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2101-NB7-MCB-SEMKO Certificate.pdf

371.54KB

2024-09-22

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2101-NB7-MCB-CB Certificate.pdf

263.93KB

2024-09-22

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Name

Size

Release time

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NB7 2P-2D(V1)-MCB-Drawing.dwg

2024-09-22

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NB7 3P-3D(V1)-MCB-Drawing.stp

5.37MB

2024-09-22

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NB7 2P-3D(V1)-MCB-Drawing.stp

2024-09-22

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NB7 1P-2D(V1)-MCB-Drawing.dwg

2024-09-22

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NB7 4P-2D(V1)-MCB-Drawing.dwg

2024-09-22

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NB7 1P-3D(V1)-MCB-Drawing.stp

4.52MB

2024-09-22

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NB7 4P-3D(V1)-MCB-Drawing.stp

2024-09-22

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NB7 3P-2D(V1)-MCB-Drawing.dwg

560.47KB

2024-09-22

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FAQs

What is the purpose of the NB7 Miniature Circuit Breaker?

The NB7 MCB protects electrical circuits from overload and short-circuit faults, while also allowing safe manual switching and isolation of circuits.

What is the difference between the B, C, and D tripping types?

Type B: For resistive loads like lighting or heating.

Type C: For general-purpose inductive loads, such as motors.

Type D: For high inrush applications such as transformers and capacitive circuits.

What is the rated breaking capacity of the NB7 series?

The breaker provides up to 6kA breaking capacity for most current ratings and 4.5kA for higher-rated circuits (50–63A), ensuring reliability in demanding electrical environments.

Where can the NB7 MCB be installed?

It is suitable for residential, commercial, and industrial power distribution systems, including lighting and socket circuits in buildings, factories, and offices.

How should the NB7 be wired and installed?

The NB7 MCB supports DIN rail mounting and accepts copper conductors up to 25mm² with a 2N·m tightening torque, ensuring stable and safe connections.