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CKJ5 1140v Low Voltage Vacuum Contactor
Compact 1140V Contactor for Harsh Underground and Industrial Conditions
The CKJ5-1140V vacuum contactor is designed for frequent control of AC motors, transformers, and capacitor banks in low-voltage, high-demand environments. With a rated voltage of 1140V and current capacity up to 630A, this contactor delivers stable performance under high mechanical and thermal stress.
It is particularly suited for coal mines, underground tunnels, industrial plants, and explosion-proof panels, where arc suppression, compact design, and long electrical life are essential.
🔧 Key Features
Rated Voltage: 1140V AC
Rated Current: 250A / 400A / 630A
Breaking Medium: Vacuum interrupter, arc-free switching
Operation: Electromagnetic coil with low control power
Mechanical Life: ≥1 million operations
Electrical Life: ≥100,000 operations at full load
Mounting Style: Panel or enclosure mounting
Standards: GB/T 14048.4, IEC 60947-4-1
⚙️ Technical Specifications
| Parameter | Value |
|---|---|
| Rated Voltage (AC) | 1140V |
| Rated Frequency | 50Hz |
| Rated Current | 250A / 400A / 630A |
| Control Voltage | AC/DC 110V / 220V / 380V |
| Short-Time Withstand Current | 5kA / 1s |
| Electrical Endurance | ≥100,000 operations |
| Mechanical Endurance | ≥1,000,000 operations |
| Contact Gap | 2.5 – 3.5 mm |
| Contact Bounce | ≤2 ms |
| Auxiliary Contacts | 1NO + 1NC (customizable) |
| Altitude Limit | ≤2000m |
| Ambient Temperature | –25°C to +55°C |
🏭 Application-Specific Advantages
Unlike generic LV contactors, the CKJ5-1140V is purpose-built for demanding industrial environments where compact size and insulation integrity are critical:
✅ Coal Mines and Tunnels
1140V systems are commonly used in mining conveyors, drainage pumps, and hoist motors.
CKJ5 excels in arc-free switching, minimizing explosion hazards in gas-prone zones.
✅ Industrial Motor Control Centers
With high current ratings, it efficiently controls large pumps, compressors, and ventilators in steel plants, chemical zones, and shipyards.
✅ Underground and Moisture-Prone Systems
Its sealed vacuum chamber avoids oxidation and arc corrosion even under high humidity or dust.
🧱 Structural Design
Vacuum Arc Chamber: High dielectric strength, arc quenching in <5ms
Electromagnetic Actuator: Reliable closing force and silent operation
Silver Alloy Contacts: Low contact resistance, long lifespan
Compact Frame: Suitable for space-limited cabinets and panels
Optional Enclosure: Available with flameproof or waterproof housing for specific industries
❓ Frequently Asked Questions
• What voltage systems can CKJ5-1140V control?
It's designed for 1140V, commonly used in mining and tunnel motor control systems.
• Can it be used for capacitor switching?
Yes. Its vacuum arc suppression is ideal for reducing inrush current during capacitor energization.
• How is it different from air contactors?
Vacuum contactors have longer life, lower maintenance, and faster arc suppression.
• What’s the delivery time?
7–12 working days for standard models. Custom control voltage or enclosures may take longer.
• Does it support remote control?
Yes, with compatible relays or PLC output connections.
📞 Request Technical Guidance or Quotation
Thor – Low Voltage Switching Engineer
📞 Tel: +86-0577-62788197
📱 WhatsApp: +86 159 5777 0984
📧 Email: thor@weishoelec.com
Need reliable contractors for confined or hazardous areas? Ask about our CKJ5 flameproof variants.
