CHINT NA1 ACB 3P/4P 1000A-4000A AC/DC Air Circuit Breaker

Name: CHINT NA1 ACB 3P/4P 1000A-4000A AC/DC Air Circuit Breaker
Brand: CHINT
SKU: 1600722064627

Brand Name:Chint
Place of Origin:China
Model Number:NA1
Rated Frequency (Hz):50/60Hz
Protection:LSI
Breaking Capacity:25kA – 100kA
Rated Voltage:400V, 690V
Type:Air

Poles

Rated Current

SKU: 1600722064627 Category: Others

Description

Chint NA1 series air circuit breaker is suitable for AC 50Hz/60Hz circuits with rated operational voltage 400V and 690V,
and rated current up to 6300A. It is mainly used to distribute electric energy and to protect circuits and electrical equipment
against overload, under-voltage, short-circuit, and single-phase earthing fault. Typical applications include power stations,
factories, mines, and modern high-rise building distribution systems.

High current application: suitable for low-voltage distribution systems with rated current up to 6300A.
Voltage options: suitable for 400V and 690V AC systems.
Protection capability: used for overload, under-voltage, short-circuit, and single-phase earthing fault protection.
Protection type: LSI.
Breaking capacity range: 25kA – 100kA.
Standard reference: IEC/EN 60947-2.

Technical Specifications

Parameter	Specification
Model Series	NA1
Type	Air Circuit Breaker (ACB)
Rated Frequency	50Hz / 60Hz
Rated Voltage	400V / 690V AC
Rated Current	Up to 6300A
Protection	LSI
Breaking Capacity	25kA – 100kA
Standard	IEC/EN 60947-2

Type designation

Structure

Technique Parameters

Accessories

Additional information

Weight	2 kg
Dimensions	25 × 25 × 25 cm
Rated Current	200A – 6300A
Poles	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 NA1 ACB 3P/4P 1000A-4000A AC/DC Air 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.

Trip Unit Protection

How to choose between Thermal-Magnetic (TMD) and Electronic (Micrologic) trip units?

Thermal-magnetic trip units provide fixed or adjustable bimetallic overload and electromagnetic instantaneous short-circuit protection, ideal for standard industrial power distribution. Electronic microprocessor trip units offer precise digital dials for L (Long-time delay overload), S (Short-time delay short-circuit), I (Instantaneous short-circuit), and G (Ground-fault protection), delivering total time-current selectivity in modern switchgear.

Ics vs Icu Capacity

What is the technical distinction between Ultimate (Icu) and Service (Ics) breaking capacity?

Icu represents the absolute maximum fault current the breaker can safely interrupt, after which inspection or replacement may be needed. Ics represents the operational breaking capacity (50%, 75%, or 100% of Icu) that the breaker can clear repeatedly and remain fully operational without performance degradation. In critical healthcare, data center, and continuous industrial applications, specify breakers with Ics = 100% Icu.

3P vs 4P Neutral

When should a 4-Pole (4P) MCCB be specified instead of a standard 3-Pole (3P) MCCB?

A 4P breaker with a switched neutral is required in systems with dual power sources (generator / utility ATS transfer) to prevent circulating neutral currents, in IT distribution networks, and in commercial installations with heavy non-linear harmonic loads (LED drivers, variable speed drives) where neutral conductor current can exceed phase currents.

Motorized & Remote Operation

How to select manual rotary handles vs motorized electric operating mechanisms?

Direct or extended door rotary handles are specified when the MCCB is enclosed inside switchgear cubicles, providing padlocking and door-interlock safety. Motor operating mechanisms (electric operators) are required for automated SCADA control, remote PLC open/close operations, and automatic transfer switch (ATS) integration.

Terminal & Mounting Options

What terminal connection hardware and mounting configurations are available?

Standard front connection lugs accept copper or aluminum compression terminals and busbar connections. For high-density panel boards, extended spreader terminals, rear connection studs, and plug-in / draw-out base cassettes are available to facilitate rapid maintenance and modular swap-out.