CJ20 Contactor

A. The contact system of the CJ20 contactor utilizes a high-purity silver-based alloy material with excellent electrical conductivity, welding resistance, and wear resistance. This ensures excellent electrical contact performance during frequent switching operations, reduces contact wear, and extends service life.

B. The core of the electromagnetic system is constructed from laminated high-quality silicon steel sheets. Silicon steel sheets have low hysteresis losses and high magnetic permeability, effectively reducing core heating and improving the efficiency and reliability of the electromagnetic system.

The coil inside the CJ20 contactor is wound with high-strength enameled copper wire and undergoes a special insulation treatment, ensuring stable operation under long-term power-on conditions and preventing short-circuit failures.

• Electrical rating: AC50/60Hz, 1140V
• Application category: AC-3, AC-4
• Altitude: Installation site ≤ 2500m above sea level
• Ambient temperature: -5°C to +40°C
• Atmospheric conditions: Relative humidity: not exceeding 50% at a maximum temperature of +40°C. Higher relative humidity is permitted at lower temperatures, with a maximum monthly average relative humidity of 90% when the average minimum temperature in the wettest month is +25°C. This takes into account condensation on the product surface caused by temperature fluctuations.
• Installation conditions: The inclination between the mounting surface and the vertical should not exceed ±5°. Products used in underground coal mines should be tested at ±15°.

Advantages of the CJ20 Series Contactors:

• Ultra-high current rating (up to 630A), suitable for heavy industrial applications.
• High-temperature-resistant design (coil allows for short-term operation at 110°C).
• CJ20 contactors offer strong vibration resistance, making them suitable for mining and metallurgical equipment.
• High reliability: High-quality raw materials and sophisticated manufacturing processes ensure stable operation of the CJ20 contactors under frequent operation and harsh environments. They offer a mechanical lifespan of millions of cycles and an electrical lifespan of hundreds of thousands of cycles with a low failure rate.
• Energy-efficient: The CJ20 contactors utilize silent energy-saving technology, significantly reducing coil energy consumption. Long-term use can significantly reduce corporate electricity costs, aligning with the trend toward green energy conservation.
• Long-life design: Optimized contact and magnetic circuit structures effectively minimize contact wear and core heating, extending product lifespan, reducing equipment maintenance and replacement frequency, and saving overall costs.​
• Strong adaptability: A variety of voltage and current specifications are available to meet the control requirements of different power devices. It can also be flexibly combined with various electrical components to build a complete electrical control system.

The contactor is mounted using screws. The CJ20 contactor (10-250A) can also be mounted on a standard 35mm rail. Its appearance and mounting dimensions are shown in the figure.

1. Regularly inspect the contactor.

a. Remove dust and dirt, especially on the incoming and outgoing wires to prevent phase-to-phase short circuits. Also, clean the core pole surfaces and guide rails.

b. Remove carbides and metal particles from the arc extinguisher.

c. Clean the contact surfaces. If there is even a slight burn (generally, when the contact tip is reduced to 1/4 of its original thickness, the contact should be replaced).

d. Tighten all fasteners.

2. Coil Replacement

To replace the coil, simply loosen the four screws securing the base plate, remove the base plate, and replace the coil.

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