Chint NQ2 DOL Starter

Name: Chint NQ2 DOL Starter
Brand: CHINT
SKU: 1769741221586018304

The Chint NQ2 DOL Starter is a DOL (Direct On-Line) Motor Starter providing complete motor starting and protection in one integrated unit. Designed for three-phase squirrel cage motors up to 0.37kW - 15kW, this starter combines contactor, overload relay, and enclosure for quick installation in pump controls, compressor stations, fan systems, and small machinery.

What is DOL Starting?

DOL (Direct On-Line) is the simplest motor starting method where the motor receives full line voltage immediately upon start. This provides maximum starting torque but draws 6-8 times rated current for a brief period. DOL is suitable for:

Integrated Protection Features

FAQs

A: NQ2 is the standard series for general applications. NQ3 offers enhanced features and higher power ratings, suitable for more demanding industrial environments.

A: DOL is generally suitable up to 10-15kW depending on your power supply capacity. Above this, consider Star-Delta or Soft Starter to reduce starting current. Check with your electrical engineer if unsure.

Description

Chint original NQ2 NQ2-15 NQ2-15P NQ2-15N NQ2-15NB NQ2-33 NQ2-33P 220V 380V 13A 18A 25A 36A 52A 68A CHNT DOL Direct On-line Starter

Chint NQ2 series electromagnetic starter ( "starter" for short hereinafter) applies mainly to circuit with AC current of 50Hz (or 60Hz),
rated operational voltage of 660V and rated controlled power up to 33kW (current up to 68A) for using to control the direct start
and halt of the electromotor to protect the motor from overload and phase failure.
The starter conforms to standards IEC/EN60947-4-1

Additional information

Power (kW)	0.75kW, 1.5kW, 2.2kW, 4kW, 5.5kW, 7.5kW, 11kW, 15kW, 18.5kW, 22kW, 30kW, 37kW, 45kW

Technical Datasheet & Downloads

📄 Technical Documentation & Product Specifications

Download official engineering datasheets, certified test standards (IEC / UL / CE), wiring diagrams, and dimensional drawings for Chint NQ2 DOL Starter.

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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.