A Servo Controlled Voltage Stabilizer is a device that provides a stable and consistent output voltage regardless of fluctuations in the input power supply. It uses a closed-loop feedback mechanism to achieve this high level of precision. At its core, the stabilizer employs a sensing circuit that continuously monitors the output voltage. If a voltage deviation is detected, the circuit activates a servo motor, which then precisely adjusts a variable transformer. This smooth, stepless correction ensures that the output voltage remains within a very tight tolerance, typically ±1%. The quick response time and high accuracy make servo stabilizers an ideal choice for protecting sensitive and expensive equipment like CNC machines, medical instruments, and data center servers from damage caused by voltage spikes, sags, and surges.