The CJ19-25 Series Switching Capacitor Contactor is a specialized electrical component designed specifically for the switching of low-voltage shunt capacitors. Unlike standard AC contactors, the CJ19 is engineered to handle the massive inrush current peaks that occur when a capacitor bank is energized—surges that can reach up to 100 times the rated current.

Equipped with inrush current suppression resistors and auxiliary contact blocks, the CJ19-25 effectively limits the surge current within the allowable range. This not only protects the contactor’s own contacts from welding but also significantly extends the service life of the capacitors and the entire Power Factor Correction (PFC) system.

• Integrated Inrush Suppression: Features a precision-engineered auxiliary contact set that closes before the main contacts. This forces the initial current through high-resistance wires, dampening the surge before the main circuit is established.
• Silver-Alloy Power Contacts: Utilizes premium silver-alloy main contacts that offer superior conductivity and high resistance to arc erosion and welding under heavy switching loads.
• Compact DIN Rail Design: Optimized for space-saving in distribution boards, this unit supports standard 35mm DIN rail mounting or direct screw mounting for maximum installation flexibility.
• Enhanced Safety Features: Designed with a transparent protective cover for auxiliary blocks and finger-safe terminals (IP20) to prevent accidental contact with live parts.
• Low Power Consumption Coil: The AC magnetic system is optimized for low hold-in power, reducing heat generation within the control cabinet.

1. Power Factor Correction (PFC) Panels: The primary component for switching individual capacitor stages in automatic reactive power compensation systems.
2. Industrial Automation: Managing reactive loads in manufacturing plants where large motors cause significant phase shifts.
3. HVAC Systems: Switching capacitors for large industrial fan motors and compressor units.
4. Commercial Buildings: Improving energy efficiency in office complexes and shopping malls by correcting power factors at the distribution level.

• Reliable Switching Cycles: Tested for over 100,000 electrical operations under full capacitor load, ensuring long-term maintenance-free performance.
• High-Precision Resistor Wires: We use specialized alloy resistance wires that provide consistent dampening across a wide range of ambient temperatures.
• Versatile Terminal Connectivity: Heavy-duty box terminals allow for secure connection of both solid and stranded copper conductors, preventing hotspots caused by loose wiring.
• Direct Replacement Compatibility: Our CJ19 series follows international standard dimensions, making it an easy drop-in replacement for most major industrial brands.

Q: Why can't I use a standard AC-3 contactor for capacitor switching?

A: Standard contactors are not designed to handle the high-frequency inrush currents of capacitors. Using a standard contactor will likely result in contact welding and reduced capacitor lifespan due to high-voltage transients.

Q: What is the maximum KVAR rating for the CJ19-25?

A: In a standard 400V/415V three-phase system, the CJ19-25 is rated for a maximum of 12kvar. For higher power banks, we recommend our CJ19-32 or CJ19-43 models.

Q: Do you offer different coil voltages?

A: Yes. While 220V AC is the standard stock item, we can provide coils for 24V, 110V, 380V, and 415V AC based on your control circuit requirements.