Over time, the key components of a capacitor system may need to be replaced, including capacitors, fuses, contactors, or controllers. Instead of replacing the entire capacitor system, it may be more economical to replace the worn parts. We offer many replacement parts to extend the life of your low-voltage capacitor equipment.
The following replacement parts may be provided:
Capacitor cells may lose capacitance over time. By replacing capacitor cells, you will continue to get optimal performance from your capacitor system. Take the following steps to determine if your capacitor cells should be replaced:
How to Check Blown Fuses and Capacitor Cells
Determine if your capacitor cell is losing capacitance using a microfarad table.
- Measure microfarads using a capacitance meter. The microfarad reading should be in the range given in the microfarad table for the kVAr and voltage of the cell. Discharge resistors do not need to be removed to take this reading.
How to replace MZI Capacitor Cells
The capacitor fuse is an overcurrent protection device that interrupts the electrical circuit to protect the capacitor. A blown fuse may occur when motors are jogged or bumped. A blown fuse may also be an indication of other problems. MZI technicians will help you diagnose the problem and size your replacement fuses.
To check blown fuses, please refer to:
How to Check Blown Fuses and Capacitor CellsTo determine the size of feeder switch, fuses, and wire, please refer to:
Recommended Wire Sizes, Switches, and Fuses For 3-Phase, 60 Hz Capacitors
Mechanically switched automatic capacitor banks include contactors that switch capacitance in and out as needed. Properly installed and maintained mechanical contactors will perform well over time. However, voltage drops, poor voltage to coils, voltage peaks or transients may cause damage to the contacts or contactor coils. If your capacitor bank contactors fail, regardless of capacitor manufacturer, contact MZI for more information replacement contactors.
Automatic capacitor systems use a power factor controller to adjust the power factor to the desired level and indicate operating conditions. If your controller is damaged or no longer functioning properly, contact MZI to determine the right replacement power factor controller for your application.
We can also retrofit new controllers into older automatic capacitor banks. See example. >