CHNT CJX2-4011 AC Contactor

CJX2-4011 is a 3-pole AC contactor from CHNT’s classic CJX2 series, with a 40A rated current and equipped with 1 NO + 1 NC auxiliary contacts.

It is suitable for AC-3 duty (e.g., three-phase motors) and widely used in industrial motor control, power distribution switching, and automation systems. It is a cost-effective choice from a leading domestic brand.

1. Model & Part Number Explanation

2. Core Technical Specifications

3. Features & Advantages
4. High-reliability contact system

Silver alloy contacts offer good conductivity, anti-welding, and arc resistance

32-sheet silicon steel core for stable, low-noise operation (≤55dB)

Red copper coil + flame-retardant housing for high temperature resistance

2. Dual mounting flexibility

Standard 35mm DIN rail for quick installation

Also supports screw mounting for panel installation

3. Energy saving

Low power consumption for long-term operation

Stable coil pull-in, reduced control circuit energy use

4. Strong compatibility

Directly matches CHNT NR2 series thermal overload relays

Dimensions compatible with Schneider LC1-D40 series for direct replacement

4. Installation & Wiring Guide

4.1 Installation Requirements

DIN rail: Clip onto 35mm standard rail and ensure full locking

Screw mounting: Use M4 screws on a flat surface with ≥10mm clearance for heat dissipation

Prefer vertical installation; avoid horizontal mounting

4.2 Wiring Specification

4.3 Key Wiring Notes

Do NOT mix main pole and coil terminals

Securely crimp wires to avoid overheating

When used with a thermal relay, connect it after T1/T2/T3

5. Typical Applications

Three-phase motor control: 7.5kW~18.5kW pumps, fans, conveyors

Industrial power distribution: cabinet switching, capacitor bank control

Automated production lines: PLC-controlled start/stop and interlock

Building systems: HVAC, elevators, fire pumps

Machine tools: lathes, milling machines, drilling machines

6. Replacement Models & Compatibility

6.1 CHNT Upgraded Replacements

6.2 Cross-Brand Equivalents

7. Purchasing & Usage Tips
8. Authenticity

Buy via official channels to avoid counterfeits

Verify model, coil voltage, and poles

2. Accessories

Must use with NR2 thermal relay for motor overload protection

Surge suppressor (SR2 series) recommended for frequent switching

3. Selection Rules

AC-3 for motors; AC-1 for resistive loads

Coil voltage must match control power

Higher protection grade for dusty/humid environments

4. Maintenance

Check terminal tightness every 6–12 months

Clean contacts and replace if worn

Energize briefly before long-term storage

> Note: CJX2-4011 is a general-purpose contactor with high cost-performance, stable supply, and easy replacement. Widely used in machinery, chemical, building materials, light industry.

Complete CHNT AC Contactor Series-Models & Order Codes

Core Overview

CHNT AC contactors cover 5 main series:

CJX2 (classic), NXC (Kunlun upgrade), NC1 (industrial IEC), NC2 (high current), NC8 (high voltage heavy duty).

Models are coded by current + auxiliary contacts + coil voltage.

Order codes start with 710010xxxx and cover 6A ~ 1250A.

1. CJX2 Series (Classic, being phased out)

Application: Small-medium motors, 35mm DIN rail, compatible with Schneider LC1-D.

> Note: 01=1NC, 10=1NO, 11=1NO+1NC. Coil voltages: AC24/36/110/220/380V. Last 3 digits = voltage code.

2. NXC Series (Kunlun Upgrade, Mainstream)

Application: CJX2 replacement, smaller, lower power, longer life.

> Note: Z = DC coil (e.g., NXC-12Z DC24V); M = mechanical latching.

3. NC1 Series (Industrial IEC Standard)

Application: International standard, high reliability, frequent operation.

> Note: NC1-N = reversing contactor. Z = DC coil.

4. NC2 Series (High Current Industrial)

Application: Heavy motors & main circuits up to 800A.

> Note: 3P/4P available. Shunt trip, undervoltage release optional.

5. NC8 Series (High Voltage Heavy Duty)

Application: Up to 1140V, 2650A for metallurgy, mining, marine.

> Note: M = mechanical latching. 4P for 3P+N systems. DC coil available.

6. General Selection & Order Code Rules

6.1 Model Coding

6.2 Order Code Format

Standard: 710010xxxxxxx

Example:

CJX2-4011 AC220V → 710010200403220

NXC-12 DC24V → 710010100000500Z

6.3 Key Selection Points

1. Load: AC-3 for motors; AC-1 for resistive loads
2. Coil voltage must match control power
3. Auxiliary contacts: 10, 01, 11, 22
4. Poles: 3P for three-phase; 4P for 3P+N
5. Series Comparison & Recommendation