Introduction

AC contactors are core electrical components widely used for switching motors, resistive loads, capacitor banks and other electrical equipment. This guide covers mainstream AC contactor series, full model specifications, technical parameters, application scenarios and selection rules, helping you pick the right product quickly for industrial control, power distribution and automation projects.

1. CJX2 Series (Most Popular General-Purpose Type)

Basic Technical Parameters

• Rated insulation voltage: 690V
• Rated operational voltage: 380V / 660V
• Rated frequency: 50/60Hz
• Utilization category: AC-3 (Motor load), AC-1 (Resistive load)
• Mechanical endurance: 10,000,000 operations
• Electrical endurance (AC-3): 1,000,000 operations
• Coil voltage options: AC 24V, 36V, 110V, 220V, 380V; DC 24V
• Auxiliary contacts: 1 NO / 1 NC (≤32A); 1 NO + 1 NC (≥40A)

Model & Performance Table (380V System)

Application

General industrial equipment, water pumps, fans, ordinary machine tools and conventional motor control circuits.

2. NXT Series (New Generation, Replacement for CJX2)

Basic Technical Parameters

• Rated insulation voltage: 1000V
• Rated operational voltage: 690V
• Current range: 6A ~ 630A
• Coil type: AC / DC dual-purpose 24～380V, low power consumption
• Mechanical endurance: 12,000,000 operations
• Electrical endurance: 1,500,000 operations
• Working temperature: -35℃ ~ +70℃

Common Models

NXT-06, NXT-09, NXT-12, NXT-16, NXT-25, NXT-32, NXT-40, NXT-50, NXT-65, NXT-80, NXT-95, NXT-115, NXT-150, NXT-185, NXT-225, NXT-265, NXT-330, NXT-400, NXT-500, NXT-630

Application

Upgraded version for universal scenarios, suitable for standard automation systems and distribution cabinets.

3. CJ20 Series (Heavy-Duty Industrial Contactor)

Basic Technical Parameters

• Rated insulation voltage: 660V
• Rated operational voltage: 380V / 660V
• Current range: 10A ~ 630A
• Auxiliary contacts: 2 NO + 2 NC (10A ~ 160A); 4 NO + 2 NC (≥250A)
• Coil voltage: AC 220V, 380V; DC 24V, 220V
• Mechanical endurance: 6,000,000 operations
• Electrical endurance: 600,000 operations

Common Models

CJ20-10, CJ20-16, CJ20-25, CJ20-40, CJ20-63, CJ20-100, CJ20-160, CJ20-250, CJ20-400, CJ20-630

Application

Heavy load equipment, crushers, electric furnaces, large-power motors and industrial distribution systems.

4. CJ40 Series (New National Standard, Updated for CJ20)

Basic Technical Parameters

• Rated insulation voltage: 660V / 1140V
• Rated operational voltage: 380V, 660V, 1140V
• Current range: 63A ~ 1000A
• Auxiliary contacts: 2 NO + 2 NC (expandable)
• Coil type: Standard AC coil; Energy-saving AC/DC universal coil (for models above 63A)

Common Models

CJ40-63, CJ40-80, CJ40-100, CJ40-125, CJ40-160, CJ40-200, CJ40-250, CJ40-315, CJ40-400, CJ40-500, CJ40-630, CJ40-800, CJ40-1000

Application

Large-capacity motors, complete switchgear and high-power industrial power distribution projects.

5. CJX1 Series (Traditional Industrial Type)

Basic Technical Parameters

• Rated insulation voltage: 1000V
• Rated operational voltage: 380V / 660V
• Current range: 9A ~ 475A
• Auxiliary contacts: 2 NO + 2 NC
• Coil voltage: AC 12V ~ 660V; DC 12V ~ 220V (small current models)
• Structure: Double-break design, dustproof with protective cover

Common Models

CJX1-9, CJX1-12, CJX1-16, CJX1-22, CJX1-32, CJX1-45, CJX1-63, CJX1-75, CJX1-85, CJX1-110, CJX1-140, CJX1-170, CJX1-205, CJX1-250, CJX1-300, CJX1-475

Application

Machine tools, textile machinery and renovation of old industrial control equipment.

6. CJT1 Series (Classic Old-Style Contactor)

Basic Technical Parameters

• Rated insulation voltage: 380V
• Rated operational voltage: 380V
• Current range: 10A ~ 150A
• Auxiliary contacts: 2 NO + 2 NC
• Coil voltage: AC 36V, 110V, 220V, 380V
• Protection degree: IP10 (10A model); IP00 (20A and above)

Common Models

CJT1-10, CJT1-20, CJT1-40, CJT1-60, CJT1-100, CJT1-150

Application

Simple control circuits and legacy low-voltage distribution cabinets.

7. CJ19 Series (Special Contactor for Capacitor Compensation)

Basic Features

Built-in surge suppression resistors to avoid inrush current during capacitor switching, specially designed for reactive power compensation cabinets.

• Rated voltage: 400V / 450V
• Current range: 9A ~ 95A

Common Models

CJ19-9, CJ19-12, CJ19-18, CJ19-25, CJ19-32, CJ19-40, CJ19-50, CJ19-63, CJ19-80, CJ19-95

Application

Capacitor switching in power factor compensation systems.

8. DIN-Rail Type Contactor (For Civil & Light Commercial Use)

Main Models & Parameters

• LMCT Series
  Models:LMCT-16, LMCT-20, LMCT-25, LMCT-32, LMCT-40, LMCT-63, LMCT-80, LMCT-100, LMCT-125 (1P / 2P /  3P / 4P optional)
• Rated Voltage: 230V(1P, 2P) / 400V(3P,4P)
• Coil Voltage: AC 24V / 110V / 230V / 380V
• Main Contacts: 1P(1NO、1NC), 2P(1NO1NC、2NO、2NC),3P(3NO、3NC),4P(2NO2NC、3NO1NC、4NO、4NC)
• Use Category:AC-7a, AC7-b

Application

Building automation, household appliances, air conditioners and lighting control systems.

Core Selection Guidelines

1. Confirm Rated Current
   Select contactor current 1.5~3 times higher than load current. Use 1.5x for resistive loads, 2.0~2.5x for regular motors, 2.5~3.0x for frequent start/stop and forward/reverse operation.
2. Match Coil Voltage
   Ensure coil voltage is consistent with control power supply to prevent burnout.
3. Select Auxiliary Contacts
   Choose 1 NO for self-locking circuits; choose 1 NO + 1 NC for interlock control.
4. Classify Load Type
   Pick AC-3 type for general motors, AC-4 type for heavy-duty frequent operation, and dedicated capacitor contactors for compensation systems.
5. Leave Current Margin
   Avoid full-load operation for long service life; select one higher current grade if conditions permit.