NB8 -63 Miniature Circuit Breaker Datasheet & Manual

NB8 -63 Miniature Circuit Breaker

The NB8-63 Miniature Circuit Breaker (MCB) provides reliable protection for residential, commercial, and industrial electrical systems. It safeguards circuits against overload and short-circuit currents, while offering efficient switching and isolation. Available with B, C, and D tripping curves, the NB8-63 supports diverse load types and ensures long service life with up to 20,000 mechanical operations. Built in compliance with IEC 60898-1 standards, this compact MCB combines performance, safety, and ease of installation.

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FAQs

What is the main application of the NB8-63 Miniature Circuit Breaker?

The NB8-63 MCB is ideal for residential, commercial, and industrial electrical installations, providing reliable protection against short-circuit and overload faults.

How do I choose the right tripping curve (B, C, or D)?

B Curve: For residential circuits or long cable runs.

C Curve: For mixed loads with motors or lighting.

D Curve: For heavy inductive loads like compressors or transformers.

What is the rated breaking capacity?

The NB8-63 MCB has a breaking capacity of 6kA, ensuring dependable protection even under high fault conditions.

Can this MCB be installed in either direction?

Yes — the device supports top or bottom wiring, allowing flexible installation in any distribution board.

What accessories are compatible with NB8-63?

It can be paired with auxiliary and alarm contacts (XF9, XF9J) and voltage release modules (OVT-1, OUVT-1) for advanced monitoring and control.

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NB8 -63 Miniature Circuit Breaker

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