CHINT NBG-63 Miniature Circuit Breaker

Name: CHINT NBG-63 Miniature Circuit Breaker
Brand: CHINT

Brand Name: CHINT
Product Type: Miniature Circuit Breaker
Model: NBG-63
Rated Voltage: AC 230V/400V, 63A
Application: Miniature circuit breaker for low-voltage distribution panels

Poles

Rated Current

Tripping Curve

Breaking Capacity

Description

CHINT NBG-63 is an original CHINT miniature circuit breaker designed for AC 230V/400V, 63A applications. It provides reliable overcurrent protection for low-voltage power distribution systems in residential, commercial and industrial installations.

1. Product Overview

The NBG-63 MCB offers dependable circuit protection with compact design for easy installation in distribution panels and switchboards. It is suitable for protecting electrical circuits against overload and short circuit conditions.

2. Main Features

Original CHINT NBG-63 miniature circuit breaker
Product type: Miniature Circuit Breaker
Rated voltage: AC 230V/400V, 63A
Compact design for DIN rail mounting
Reliable overcurrent and short circuit protection
Suitable for distribution boards and panel installations

3. Technical and Application Notes

Please confirm the rated current, breaking capacity and pole configuration before ordering. Selection should be based on load requirements and installation environment. If you need help choosing the correct CHINT MCB, we can assist with model matching.

4. Typical Applications

Residential electrical distribution
Commercial building panels
Industrial control systems
OEM panel assemblies
Project and wholesale supply

5. Ordering Support

Send us the rated current, pole number, breaking capacity and target market, and we can help confirm the correct CHINT MCB for your project.

6. Product Catalog

Additional information

Poles	1P, 2P, 3P, 4P
Rated Current	1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A
Tripping Curve	B, C, D
Breaking Capacity	6kA

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for CHINT NBG-63 Miniature Circuit Breaker.

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Official Technical Datasheet (PDF) Complete electrical ratings, tripping characteristics, dimensions, and compliance specifications.

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2D/3D CAD & Dimensional Drawings STEP, DXF, and PDF CAD drawing files for panel builders and switchgear designers.

Technical FAQ & Selection Guide

💡 Frequently Asked Technical Questions & Selection Guide

Pure engineering specifications, tripping curve parameters, and electrical selection guidance for panel builders and system designers.

Curve Selection

How to choose between Tripping Curves B, C, and D for this miniature circuit breaker?

Curve B trips at 3–5 In (designed for resistive loads, electric heating, and domestic appliances with negligible inrush). Curve C trips at 5–10 In (the standard international choice for residential and commercial lighting, socket outlets, and small induction motors). Curve D trips at 10–14 In (specifically engineered for high-inrush inductive equipment such as industrial transformers, heavy motors, compressors, and welding circuits).

Breaking Capacity

How do I determine whether 6kA or 10kA breaking capacity is required for my installation?

Breaking capacity (Icn/Icu) must exceed the calculated prospective short-circuit fault current at the installation point. 6kA (IEC 60898-1) is standard for residential consumer units and sub-distribution branch circuits located downstream. 10kA (IEC 60947-2) is required for industrial facilities, main switchboards, commercial distribution panels, or circuits situated close to supply transformers where fault levels are high.

Poles & Neutral Isolation

How to choose the correct number of poles (1P, 1P+N, 2P, 3P, 3P+N, 4P) for single-phase and three-phase circuits?

For single-phase 230V circuits: 1P provides active phase protection; 1P+N or 2P isolates both live and neutral lines simultaneously (essential for TT earthing systems and sensitive sub-panels). For three-phase 400V systems: 3P protects balanced 3-wire motor loads; 3P+N or 4P is required for 4-wire mixed single-phase loads to ensure complete neutral disconnection during isolation.

DC vs AC Application

Can this circuit breaker be used in DC circuits (Solar PV, Battery Storage, Telecom)?

Standard AC breakers cannot safely extinguish DC arcs due to the absence of natural zero-crossing current. For DC circuits (60V to 1000V DC), select specialized DC breakers (such as DZ158-125 DC or NM8NDC series) equipped with permanent magnetic arc-blowout chutes and strictly observe polarity wiring to prevent arc re-ignition.

Modular Accessories & Interlocks

What modular accessories and mechanical interlocks can be fitted to this breaker?

Standard modular clip-on accessories can be mounted directly on the side without tools: OF (Auxiliary Contact for remote status indication), SD (Alarm Contact for trip fault signaling), MX (Shunt Trip for remote emergency tripping), MN (Under-voltage Release for voltage loss protection), and NXBZ mechanical interlock kits for manual generator/mains transfer switches.