CHINT NXB-80 Miniature Circuit Breaker

Name: CHINT NXB-80 Miniature Circuit Breaker
Brand: CHINT
SKU: 10000006678493

CHINT NXB-80 miniature circuit breaker is designed for higher-current low-voltage distribution, panel protection, and commercial electrical systems. It is suitable for distributors, installers, and buyers looking for practical 80A DIN rail MCB products.

Poles

Rated Current

Tripping Curve

SKU: 10000006678493 Category: Chint MCB

Description

CHINT NXB-80 miniature circuit breaker is designed for AC 50Hz/60Hz low-voltage distribution circuits and provides reliable overload protection, short-circuit protection, and positive isolation for distribution boards, control panels, and higher-load electrical systems. The NXB-80 series supports 1P, 1P+N, and 2P configurations, B / C / D tripping characteristics, and DIN rail installation for residential, commercial, and light industrial power distribution applications.

Technical Specifications

Parameter	Specification
Model Series	NXB-80
Type	Miniature Circuit Breaker (MCB)
Trip Curve	B / C / D
Rated Current	80A
Pole Number	1P / 1P+N / 2P
Rated Voltage	240V AC
Rated Frequency	50Hz / 60Hz
Breaking Capacity	6kA
Protection Function	Overload protection / Short-circuit protection / Positive isolation
Mechanical Life	20,000 cycles
Electrical Life	10,000 cycles
Rated Impulse Withstand Voltage	4kV
Power Consumption per Pole	≤ 6.5W
Standard	IEC 60898-1
Certification	CE
Application	Low-voltage distribution / Commercial panels / Higher-load circuit protection / DIN rail mounting

Additional information

Weight	0.6 kg
Dimensions	22 × 22 × 22 cm
Rated Current	80A
Poles	1P, 2P
Tripping Curve	B, C, D

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for CHINT NXB-80 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.