A Variac (comes from variable alternating current), also called a variable autotransformer, is a specialised electrical transformer designed to adjust AC voltage smoothly and continuously. Unlike a traditional transformer with separate primary and secondary windings, a Variac uses a single winding with a sliding carbon brush to tap off a variable portion of the winding. This allows precise control of the output voltage, ensuring precise voltage regulation across various applications. Additionally, Variacs come in different power ratings, construction (encapsulated, enclosed, open), lengths, and mounting configurations to meet different application requirements.
Why Buy Variacs?
Purchasing a Variac transformer provides users with unparalleled control over AC voltage. These specialised transformers offer a cost-effective solution for voltage regulation. They are robust, reliable, have lower leakage reactance, and can handle significant amounts of power loads. Additionally, their one-winding resolution makes them lighter, smaller, and more affordable than standard two-winding transformers.
View Our Range of Best-in-Class Variac Variable Transformers:
Our range includes both single- and three-phase variable autotransformers:
- 1 Phase Variacs – Our single-phase Variacs are designed for applications requiring adjustable voltage in single-phase AC circuits. These units offer smooth, linear voltage control with high efficiency and minimal distortion. A 1-phase Variac is available in various current and voltage ratings.
- 3 Phase Variacs – A 3-phase Variac provides synchronised and balanced voltage adjustments for 3-phase AC power applications. These units are essential for testing and controlling three-phase motors, machinery, and power distribution systems.
Typical Uses of Variac Variable Autotransformers:
Variacs are typically used for transmission, distribution, and conversion of power. They utilise step-down transformers to lower the voltage from high-voltage AC mains, which are suitable for multiple electronic devices. Variac variable transformers find applications in a wide range of fields, including:
- Equipment Testing
- Laboratory Research
- Motor Speed Control
- Lighting Control
- Heating Control
- Appliance Testing and Repair
- Manufacturing and Industrial Processes.
