NCH8-M Modular AC Contactor | CHINT

Name: CHINT NCH8-M Modular AC Contactor Manual Operation
Brand: CHINT
SKU: CHINT-NCH8-M-CONTACTOR

Description

Product Overview

The NCH8-M Modular AC Contactor combines automatic control with manual operation, featuring AUTO, ON, and OFF modes. This versatile contactor is ideal for lighting, heating, ventilation, and automation systems in residential, commercial, and small industrial environments.

Main Features

Dual Operation Modes: Automatic control with manual override capability
Three Position Switch: AUTO, ON, and OFF modes for flexible control
Silent Operation: Ideal for offices, hospitals, and residential spaces
Modular Design: DIN rail or screw mounting for easy installation
Wide Current Range: Available in 16A, 20A, 25A, 40A, and 63A models
High Power Capacity: Supports loads up to 11 kW
Versatile Applications: Suitable for lighting, heating, ventilation systems

Technical Specifications

Parameter	Specification
Rated Current	16A, 20A, 25A, 40A, 63A
Rated Voltage	AC 230V, 400V
Power Capacity	Up to 11 kW
Operation Modes	AUTO, ON, OFF
Mounting	35mm DIN rail or screw fixing
Installation	Modular panels or distribution boards

Technical and Application Notes

The NCH8-M contactor is designed for switching and control of lighting systems, heating equipment, ventilation systems, and small motors. Its silent operation makes it particularly suitable for noise-sensitive environments such as hospitals, libraries, and residential buildings.

The manual operation feature allows maintenance personnel to override automatic controls when needed, providing flexibility for testing and system commissioning.

Typical Applications

Lighting control systems
Heating and HVAC systems
Ventilation and air conditioning
Industrial automation
Residential electrical panels
Commercial building management

Ordering Support

When ordering NCH8-M modular contactors, please specify:

Rated current (16A, 20A, 25A, 40A, or 63A)
Rated voltage (230V or 400V)
Control voltage for coil
Mounting preference (DIN rail or screw)
Any auxiliary contact requirements

Product Catalog

For detailed specifications and technical data, please refer to the product catalog below.

Additional information

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-M Modular AC Contactor Manual Operation.

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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.