Cj19 25a~170a Switching Capacitor AC Contactors Modular Design 3 Pole IEC

The CJ19 series switching capacitor contactor (compatible with CJ19, CJ19i, and CJ16 models) is an essential component for automated Power Factor Correction (PFC) systems. Standard AC contactors often fail when switching capacitor banks due to the extreme inrush currents (up to 100x rated current) that occur at the moment of energization.

The CJ19 is engineered specifically to solve this problem. Equipped with current-limiting resistors and auxiliary contact blocks, it suppresses the initial surge, protecting the capacitor bank from damage and preventing contact welding. Whether you are building a new capacitor panel or maintaining an existing industrial grid, the CJ19 ensures stable, long-term switching performance.

• Superior Inrush Current Suppression: Features a "pre-make" auxiliary contact block connected to current-limiting wires. This ensures that the surge is dampened before the main contacts close, extending the life of both the contactor and the capacitors.

• Optimized for Capacitor Loads: Specifically designed to handle the high capacitive reactive power of AC 50/60Hz circuits with rated voltages up to 690V.

• Modular & Compact Design: The CJ19 integrates the suppression block directly onto the contactor frame, saving valuable rail space inside the distribution cabinet compared to discrete resistor setups.

• Enhanced Contact Durability: Silver-alloy contacts provide excellent conductivity and high resistance to electric arc erosion, rated for thousands of switching cycles under heavy load.

• Safety & Reliability: Manufactured with flame-retardant materials and high-insulation plastics, ensuring safe operation in high-temperature industrial environments.

1. Automatic Capacitor Banks: The core switching element for low-voltage reactive power compensation panels.

2. Industrial Power Quality Systems: Maintaining high power factor in factories with heavy inductive loads (motors, transformers).

3. Commercial Building Distribution: Reducing energy costs and avoiding "low power factor" penalties from utility providers.

4. Wind & Solar Grid Tie-in: Managing the reactive power requirements of renewable energy inverters.

• Drop-in Compatibility: Our CJ19 units follow standard mounting dimensions, making them perfect replacements for CHINT, ABB, or Schneider equivalents in existing panels.

• Rigorous Quality Testing: Every unit undergoes mechanical and electrical endurance testing to ensure the current-limiting resistors engage at the precise millisecond required for protection.

• Expert Technical Support: We assist in selecting the correct contactor size based on your specific kvar rating and operating voltage to prevent over-sizing or premature failure.

• Global Logistics: Available for bulk export with reinforced packaging to ensure the delicate current-limiting wires remain intact during transit.

Q: Can I use a standard AC-3 contactor instead of the CJ19 for capacitors?

A: It is not recommended. Standard contactors lack the current-limiting resistors. Switching capacitors with a standard contactor will likely lead to contact welding and shortened capacitor life due to the uncontrolled inrush current.

Q: How do I select the right size?

A: Selection is based on the kvar rating of your capacitor bank at a specific voltage. For example, a CJ19-25 is typically rated for up to 12kvar at 400V. Always leave a 15-20% safety margin for high-temperature environments.

Q: Are the current-limiting resistors replaceable?

A: The suppression block is modular; however, once the wires are significantly charred or damaged, it is safest to replace the entire suppression head to ensure reliable protection.