NCX1 Dust-proof AC Contactor

Name: CHINT NCX1 Enclosed Dust-Proof AC Contactor
Brand: CHINT
SKU: NCX1

Description

Product Overview

NCX1 series anti-dust AC contactor is designed for power systems with AC 50Hz, rated insulation voltage of 690V, rated working voltage of 380V and rated working current up to 95A under AC-3 use category. It is used for remote connection and disconnection of circuits, suitable for controlling the start, stop and reversal of AC motors.

Main Features

Anti-dust design for harsh industrial environments
Rated insulation voltage: 690V
Rated working voltage: 380V AC
Rated current: 9A~95A (AC-3 category)
AC 50Hz operation
Suitable for remote connection and disconnection circuits
Can form electromagnetic starter with thermal relay for overload protection
Complies with IEC 60947-4-1 standard

Technical Specifications

Parameter	Specification
Rated Current	9A ~ 95A (AC-3)
Rated Voltage	380V AC
Insulation Voltage	690V
Frequency	50Hz
Ambient Temp	-5℃ ~ +40℃
Altitude	≤2000m
Pollution Class	Class 3
Installation Category	Category III
Standard	IEC 60947-4-1

Technical and Application Notes

NCX1-9~25 AC contactors are mainly used in electrical circuits under Category AC-3 with rated operating current up to 25A at rated operating voltage of 380V for long-distance circuit making and breaking. They can be used with appropriate relay to form electromagnetic starters to protect circuits from overloading. In addition to traditional contactor applications, also suitable for building materials processing machinery, metal processing machinery, metallurgical machinery, textile machinery, construction machinery, petroleum industry, machine tools, cement industry, chemical industry, photovoltaic systems, wind power systems, and other dust environment applications.

Typical Applications

Building materials processing machinery
Metal processing machinery
Metallurgical machinery
Textile machinery
Construction machinery
Petroleum industry
Machine tools
Cement industry
Chemical industry
Photovoltaic systems
Wind power systems
Other dust environment applications

Ordering Support

For detailed ordering information, model selection guidance, and technical support, please contact our sales team. Customized solutions available for specific application requirements.

Product Catalog

Please refer to the catalog images below for detailed specifications:

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for CHINT NCX1 Enclosed Dust-Proof AC Contactor.

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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.

AC-1 / AC-3 Duty

How to calculate contactor rating based on motor power and utilization categories (AC-1 vs AC-3 vs AC-4)?

AC-3 rating applies to standard squirrel-cage motor starting and stopping during normal run (starting current 5–7x In). For non-inductive or purely resistive heating loads, use the higher AC-1 rating. For severe inching, jogging, and plugging applications (AC-4 duty), derate the contactor or upsize by 1 to 2 frame sizes to prevent contact erosion.

Coil Voltage Selection

How to choose the correct control coil voltage, frequency, and electronic wide-voltage options?

Standard AC coils include 24V, 48V, 110V, 220V/230V, 380V at 50/60Hz. For DC control loops or PLC outputs, specify DC coils or electronic wide-range AC/DC coils (e.g. 100V–250V AC/DC) which feature built-in surge suppression, low holding power consumption, and immunity to voltage dips.

Overload Coordination

How to size and coordinate the matching thermal overload relay (TOR) for Type 2 protection?

Select a thermal overload relay whose current setting range straddles the motor full-load current (FLA). Set the dial precisely to 1.0x motor nameplate FLA. For IEC 60947-4-1 Type 2 coordination, pair the contactor and relay with backed-up upstream fuses or fast-acting MCB/MCCB to prevent welding under fault conditions.

Auxiliary & Interlocks

What auxiliary contact blocks and mechanical interlocks can be added for motor reversing?

Units feature built-in 1NO or 1NC auxiliary contacts, expandable with top-mounted 2-pole or 4-pole auxiliary contact blocks (F4 / AX) and pneumatic timer delay blocks. For forward/reverse motor starters or star-delta starter assemblies, add side-mounted mechanical interlock units (MI) with electrical interlocking.

Ambient & Altitude Derating

How do ambient temperature and installation altitude affect contactor performance?

Standard ratings are calibrated for -5°C to +40°C. For ambient temperatures exceeding 55°C or altitudes above 2000m (where reduced air density diminishes heat dissipation and dielectric insulation), derate operational current by 2% per 100m above 2000m and verify insulation voltage limits per IEC standards.