GVN VRK VRK-M1 SERIES

Variacs, also known as variable autotransformers, are electrical devices that produce variable voltage output by using a single winding to serve as both primary and secondary. The core principle of a variac is based on the autotransformer design, where a single continuous winding is divided into multiple sections, each corresponding to different voltage levels. The output voltage is adjusted by sliding a brush or wiper along the winding, tapping different parts of the coil to change the voltage supplied to the load. Variacs are especially useful in applications that require satisfactory voltage control, such as laboratory experiments, motor speed control, or testing electrical equipment over a wide voltage range. They have become popular because they provide smooth, continuous voltage regulation without the abrupt transitions found in step-transformers and relays. Unlike conventional transformers, which isolate the primary and secondary windings, a Variac can provide a direct relationship between input and output voltages, often resulting in much higher efficiency in voltage adjustment with minimal losses.