A Linear Servo Stabilizer, also known as a rolling contact type stabilizer, is an advanced voltage regulation device that uses a motor-driven mechanism to provide a precise and stable output voltage. Unlike older relay-type stabilizers that offer stepped voltage correction, a linear servo stabilizer provides a continuous, stepless voltage adjustment. This is achieved by a carbon roller that moves smoothly across the windings of a variable autotransformer, allowing for highly accurate voltage regulation, often within a narrow tolerance of ±1%. Its key benefits include a very fast response time to voltage fluctuations, high efficiency, and the ability to handle wide input voltage ranges, making it an ideal choice for protecting sensitive and high-value equipment.