Chint NCH8 Modular Contactor

Name: Chint NCH8 Modular Contactor
Brand: CHINT
SKU: 1600649871074

Electricity Type:AC
Brand Name:Chint
Place of Origin:China
Model Number:NCH8
Phase:3
Main Circuit Rating Current:20A 25A 40A 63A

Poles

Rated Current (AC-3)

Coil Voltage

The Chint NCH8 Modular Contactor is an industrial-grade AC contactor designed for building automation, lighting control, heating systems, and small motor control in distribution boards. With current ratings from 0.1A - 630A and 3P / 4P pole configuration.

Technical Specifications

Frequently Asked Questions

A: The contactor should be rated for at least the motor's full load current (FLC). For AC-3 duty, use the motor's rated current. For heavy start applications, consider the next size up.

A: Yes, a contactor provides switching control but does NOT protect against motor overload. You need a thermal overload relay (such as Chint NR2/NXR series) mounted directly below the contactor.

Description

Chint NCH8 20A 25A 40A 63A NCH8-20/20 NCH8-20/11 NCH8-40/20 NCH8-40/40 NCH8-63/40 NCH8-63/22 CHNT Din rail Modular Contactor

Chint NCH8 Modular AC Contactor 20~63A

1. General
1.1 Electric ratings: up to 20A, 25A, 40A, 63A, 230V, 400V AC50/60Hz;
1.2 Utilization category: AC-1, AC-7a, AC-7b;
1.3 Standard: IEC/EN 61095

2. Features
2.1 Compact design and modularization design;
2.2 Insulation material with excellent performances has been adopted to enhance the operation security to a great extent;
2.3 Elegant appearance. A mounting instruction diagram is appended for convenient operation;
2.4 No noise during operation.
2.5 IP20

Additional information

Weight	2 kg
Dimensions	25 × 25 × 25 cm
Poles	1P 1NO, 1P 1NC, 2P 2NO, 2P 1NO+1NC, 2P 2NC, 4P 4NO, 4P 3NO+1NC, 4P 2NO+2NC
Rated Current (AC-3)	20A, 25A, 40A, 63A
Coil Voltage	AC 24V, AC 220V, AC 230V, AC 240V

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for Chint NCH8 Modular Contactor.

📥

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.