Capacitor Switching Contactors

FRAKO Capacitor Switching Contactors are specifically designed for capacitor switching to achieve reliability and long life expectancy for your capacitor system. 

FRAKO Contactors are available with or without pre-charge resistors.

Modern capacitor systems use special contactors that are equipped with resistors to suppress the switching currents. The resistors are switched in series with the capacitor prior to the closing of the main contacts and removed from the circuit after energization, so as not to cause additional power losses.

This feature is referred to as leading transition contact with pre-charge (or pre-insertion) resistor and offers these advantages:

• Significant damping of inrush current
• Suppression of voltage transients during switching
• Protection for both capacitor and contactor
• Extended capacitor and contactor life
• May be used with and without series reactors
• Increased system reliability

Capacitors with series reactors (for tuning or detuning) have lower peak inrush current than systems that do not include reactors. For these applications, FRAKO offers contactors with special wear-resistant contact material which enables them to switch the reactor/capacitor network without the need for pre-charge resistors. These special contactors offer several advantages for capacitor switching applications that include series-connected reactors: Safe switching (ON and OFF) of reactor/capacitor steps

• Improved voltage quality made possible through chatter-proof switching operations
• Extended capacitor life
• Extended contactor life (>100,000 switching operations)
• Increased system reliability

Call us 1-262-618-2403, Email or visit our Contact us page for Application Engineering or Quotes for Capacitor Switching Contactors.