Application
CJX2 series AC contactor is suitable for using in the circuits up to the rated voltage 660V, AC50 or 60Hz, rated current up to 95A, for making, breaking, frequently starting & controlling the AC motor. Combined with the auxiliary contact block, time delay & machine –interlinking device etc, it becomes the time delay contactor, reversible contactor, star-delta starter, and with the thermal relay, it can be combined into the electromagnetic starter.
Technical parameter
| Type | CJX2-09 | CJX2-12 | CJX2-18 | CJX2-25 | CJX2-32 | CJX2-40 | CJX2-50 | CJX2-65 | CJX2-80 | CJX2-95 |
| Rated current(A) | 380/400V | AC-3 | 9 | 12 | 18 | 25 | 32 | 40 | 50 | 65 | 80 | 95 |
| AC-4 | 3.5 | 5 | 7.7 | 8.5 | 12 | 18.5 | 24 | 28 | 37 | 44 |
| 660/690V | AC-3 | 6.6 | 8.9 | 12 | 18 | 21 | 34 | 39 | 42 | 49 | 49 |
| AC-4 | 1.5 | 2 | 3.8 | 4.4 | 7.5 | 9 | 12 | 14 | 17.3 | 21.3 |
| Conventional air heating current(A) | 20 | 20 | 32 | 40 | 50 | 60 | 80 | 80 | 95 | 95 |
| Rated isolation voltage(V) | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 |
| Controlled three - phase squirrel - cage motor power(AC-3)kW | 220/230 | 2.2 | 3 | 4 | 5.5 | 7.5 | 11 | 15 | 18.5 | 22 | 25 |
| 380/400 | 4 | 5.5 | 7.5 | 11 | 15 | 18.5 | 22 | 30 | 37 | 45 |
| 660/690 | 5.5 | 7.5 | 10 | 15 | 18.5 | 30 | 37 | 37 | 45 | 45 |
| Operating frequency(times/h) | Electric life | AC-3 | 1200 | 1200 | 1200 | 1200 | 600 | 600 | 600 | 600 | 600 | 600 |
| AC-4 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 | 300 |
| Mechanical life | 3600 | 3600 | 3600 | 3600 | 3600 | 3600 | 3600 | 3600 | 3600 | 3600 |
| Electric life | AC-3 | 100 | 100 | 100 | 100 | 80 | 80 | 60 | 60 | 60 | 60 |
| AC-4 | 20 | 20 | 20 | 20 | 20 | 15 | 15 | 15 | 10 | 10 |
| Mechanical life(10 thousand times) | 1000 | 1000 | 1000 | 1000 | 800 | 800 | 800 | 800 | 600 | 600 |
| Equipped with fuse type | RT16-20 | RT16-20 | RT16-32 | RT16-40 | RT16-50 | RT16-63 | RT16-80 | RT16-80 | RT16-100 | RT16-125 |
| Cold end | non-predictive tip cord
Predictive tip cord
Non-predictive end | Radical | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 |
| mm² | 1/2.5
1/4
1/4 | 1/2.5
1/2.5
1/4 | 1/2.5
1/4
1/4 | 1/2.5
1/2.5
1/4 | 1.5/4
1.5/6
1.5/6 | 1.5/4
1.5/4
1.5/6 | 2.5/6
2.5/10
2.5/10 | 2.5/6
2.5/6
2.5/10 | 2.5/6
2.5/10
2.5/10 | 2.5/6
2.5/6
2.5/10 | 6/25
6/25
6/25 | 4/10
4/10
4/10 | 6/25
6/25
6/25 | 4/10
4/10
4/10 | 6/25
6/25
6/25 | 4/10
4/10
4/10 | 10/35
10/35
10/35 | 6/16
6/16
6/16 | 10/35
10/35
10/35 | 6/16
6/16
6/16 |
| AC | 50Hz | Close(V) | 70 | 70 | 70 | 110 | 110 | 200 | 200 | 200 | 200 | 200 |
| Coil | Keep(V) | 9 | 9 | 9.5 | 14 | 14 | 57 | 57 | 57 | 57 | 57 |
| Power | Power(W) | 1.8-2.7 | 1.8-2.7 | 3-4 | 3-4 | 3-4 | 6-10 | 6-10 | 6-10 | 6-10 | 6-10 |
| Action range | Close voltage:85%Us-110%Us; open voltage:20%Us-75%Us |
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| Auxiliary contact basic parameters | AC-15:le:0.95A 380V/400V DC-13:le:0.15A 220V/250V Ith:10A |
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Working conditions and installation
| Condition | Specification |
|---|
| Ambient Temperature | -5℃ ~ +40℃ (24h average ≤35℃) |
| Maximum Altitude | ≤2000m |
| Relative Humidity | ≤50% at +40℃; higher allowed at lower temperatures (condensation protection required) |
| Pollution Level | 3 |
| Mounting Category | III |
| Mounting Inclination | ≤±5° (vertical plane) |
| Shock Resistance | No significant shock/vibration at installation site |
| Coil Action Range | Close: 85%-110% Us; Open: 20%-75% Us |
| Auxiliary Contact (AC-15) | Ie=0.95A @ 380V; Ith=10A |
Product Application Scenarios
Industrial AC Motor Control: Frequent starting/stopping of three-phase squirrel-cage motors in factories, workshops and production lines (e.g., pumps, fans, conveyors).
- Low-Voltage Distribution Systems: Making/breaking of AC 50/60Hz power circuits up to 660V in commercial and industrial distribution cabinets.
- Automation Systems: Integration with PLCs, time delay devices and auxiliary contact blocks for automated motor control in smart factories and building automation.
- Star-Delta Motor Starters: Combination with contactor accessories to form star-delta starters for large motor soft starting (reducing inrush current).
- Electromagnetic Starter Assemblies: Matching with thermal overload relays for motor overload/short-circuit protection in industrial equipment.
- Commercial & Residential Equipment: Control of heavy-duty AC loads (e.g., air compressors, water pumps) in commercial buildings and large residential complexes.
Product size
Frequently Asked Questions (FAQ)
Q: What is the difference between AC-3 and AC-4 operation categories for the CJX2 series AC contactor, and how to select them?
A: AC-3 is the standard category for squirrel-cage motor control, designed for normal starting, running and stopping of motors with no significant inrush current during operation—this is the most common selection for general motor control (e.g., fans, pumps). AC-4 is for heavy-duty motor starting and plugging/braking, handling high inrush current and frequent reverse operation (e.g., hoists, conveyors with rapid stop/reverse). The CJX2 series supports both categories, with AC-4 rated current lower than AC-3 for the same model due to the higher load stress.
Q: Why does the CJX2 series have different electrical/mechanical life ratings for different models?
A: Electrical life is determined by arc erosion during contact make/break, and mechanical life by wear of mechanical components (e.g., springs, armatures). Smaller models (CJX2-09/12/18) have higher electrical/mechanical life (1000k mechanical, 100k AC-3 electrical) because they handle lower currents and less arc erosion. Larger models (CJX2-80/95) have lower life ratings (600k mechanical, 60k AC-3 electrical) due to higher current loads, more severe arc erosion and greater mechanical stress during operation—this design aligns with IEC 60947-4-1 for optimal durability per load.
Q: How does the CJX2 series combine with other components to achieve extended motor protection functions?
A: The CJX2 contactor forms a complete electromagnetic starter when combined with a thermal overload relay—this assembly provides basic motor control (start/stop) plus overload protection (the thermal relay trips on excessive motor current to prevent overheating). Adding auxiliary contact blocks enables circuit interlocking (preventing reverse operation) and signal feedback (e.g., motor running status). Matching with time delay devices creates a time delay contactor for sequential motor starting (e.g., star-delta soft starting for large motors to reduce grid inrush current).
Q: What factors should be considered when selecting a CJX2 model for a 380V AC motor?
A: The core selection criteria are the motor’s rated power (kW) and operation category (AC-3/AC-4) at 380V. For normal continuous operation (AC-3), select a model with a controlled motor power rating equal to or higher than the motor’s rated power (e.g., CJX2-25 for an 11kW 380V motor). For heavy-duty/plugging operation (AC-4), upgrade to a larger model to accommodate the higher inrush current (e.g., CJX2-40 for an 18.5kW AC-4 motor). Additional factors include ambient temperature (derate for high temperatures) and mounting altitude (derate above 2000m).
Q: What is the significance of the coil voltage action range (85%-110% Us) for the CJX2 series?
A: The 85%-110% Us close voltage range ensures the contactor can reliably close even with minor grid voltage fluctuations (a common issue in industrial power grids), avoiding failure to start the motor due to low voltage. The 20%-75% Us open voltage range ensures the contactor only opens when the grid voltage drops significantly, preventing accidental motor shutdown from temporary small voltage sags. This coil design enhances the contactor’s stability and reliability in harsh industrial power grid environments.
About the Manufacturer
Zhejiang Singi Electrical LLC is a leading professional manufacturer of low-voltage electrical equipment with a 40000㎡ modern factory area, 300+ skilled employees and a complete production chain (stamping, sheet metal, spot welding, die workshops). The company holds ISO 9001 (Quality), ISO 14001 (Environmental) and ISO 45001 (Occupational Health and Safety) certifications, with strict quality inspection processes to ensure product reliability.
Specializing in R&D, production and sales of AC contactors, PV electrical products and low-voltage distribution devices, Singi Electric offers OEM/ODM customization services and in-stock supply for fast delivery. With advanced production equipment and a professional R&D team, the company has established long-term cooperative relationships with industrial automation, power distribution and photovoltaic enterprises worldwide, providing high-performance, cost-effective low-voltage electrical solutions.
Official Website:
https://www.singi.comCore Products: CJX2 Series AC Contactors, PV DC Isolator Switches, PV Special RCDs, Low-Voltage Distribution Components
Service Advantages: ISO-certified manufacturing, OEM/ODM customization, in-stock supply, global technical support, factory direct pricing
