A power-factor correction unit is an electronic device used to improve the efficiency of electrical systems. It helps to reduce the amount of energy wasted and improve the power factor. Some synonyms for power-factor correction unit include power-factor controller, power-factor corrector, reactive power controller, and capacitor bank. These devices are commonly used in industrial settings, where high levels of electrical power are used and energy efficiency is critical. By improving the power factor, these units can help to reduce energy costs and lower the carbon footprint of an organization. Different types of power-factor correction units are available, including fixed capacitor banks and automatic power controllers, providing a range of options for optimizing electrical systems.