Viz LT Shunt Capacitors are used for power factor correction. These capacitors are compact in size and are typically used in Automatic Power Factor Correction Panels.
Viz Power Factor Controller detects the load power factor and automatically switches "ON/OFF" the required amount of capacitors so as to maintain the power factor as close as possible to unity.
Viz De-Tuning Reactors are to tune the capacitor bank to desirable frequency in order to avoid the probability of harmonic amplification and thereby protect the capacitors from adverse effects of harmonics. They also help in limiting switching in-rush current.
During switching of a capacitor, transient currents to the order of 200 times the rated current can flow stressing the capacitor and the switching contacts immensely. The modern Power Factor Correction systems use new generation Viz Contactors designed to switch the capacitor first through contact block of three early make auxiliary contacts in series with current limiting resistors to limit in-rush current to the value within contactor rated capacity, thereby improving the life of the contacts and the capacitors.