Name: NB7 Miniature Circuit Breaker
Brand: Chint

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.

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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.

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NB7 Miniature Circuit Breaker

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