CHINT NXB-63 4-Pole C63A Miniature Circuit Breaker

Name: CHINT NXB-63 4-Pole C63A Miniature Circuit Breaker
Brand: CHINT
SKU: 1600725043355

BCD Curve:B, C, D
Type:MCB
Brand Name:Chint
Place of Origin:China
Model Number:NXB-63
Rated Frequency (Hz):50/60Hz
Protection:LSI
Breaking Capacity:6kA
Rated Voltage:220-240V, 380-415V
Type:Mini

Poles

Rated Current

SKU: 1600725043355 Category: Others

Description

Chint NXB-63 miniature circuit breaker is designed for low-voltage distribution systems and provides reliable protection against overload,
short circuit, and isolation requirements in household, commercial, and light industrial circuits. The NXB-63 series is suitable for DIN rail installation
and is widely used in distribution boards, control panels, building electrical systems, and export projects requiring practical 1A-63A MCB solutions.

Technical Specifications

Parameter	Specification
Model Series	NXB-63
Type	Miniature Circuit Breaker (MCB)
Standard	IEC60898-1
Certification	CCC / CE
Major Function	Overload protection / Short circuit protection / Positive isolation
Rated Current	1A – 63A
Rated Voltage	220V / 230V / 240V AC (1P, 1P+N); 380V / 400V / 415V AC (2P, 3P, 3P+N, 4P)
Rated Frequency	50Hz / 60Hz
Electromagnetic Release Type	B / C / D
Pole Number	1P / 1P+N / 2P / 3P / 3P+N / 4P
Mechanical Life	20,000 cycles
Electrical Life	10,000 cycles
Rated Short-Circuit Breaking Capacity (Icn)	6000A
Short-Circuit Breaking Capacity (Ics)	6000A
Rated Impulse Withstand Voltage (Uimp)	4kV

Additional information

Weight	2 kg
Dimensions	25 × 25 × 25 cm
Rated Current	1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A
Poles	1P, 2P, 3P, 4P

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-63 4-Pole C63A Miniature Circuit Breaker.

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

Download PDF Datasheet

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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.