Variable Auto Transformers

Description of Variac

• As two winding transformers Magnetic and Controls is also engaged in manufacturing Variable autotransformer with toroidal core type. ‘Variac’ is the trademark name of Variable auto transformer.
• Variac provides a voltage adjustable source of alternating current electricity. A Variable auto transformer is single coil wound transformer where two portions of the coil is used as primary and secondary.
• They are also different from regular auto transformer since they are equipped with automatic switchgear in order to automatically step up or down depending on preset condition. Magnetic and Controls Variac helps in maintaining a steady voltage in customers service during wide range of load condition. By exposing a part of winding coil and making the secondary connection through a sliding brush a continuously variable turns ratio can be obtained allowing very smooth control of voltage.
• We manufacture both single phase and three phase variac.

Features of Single Phase and Three Phase Variac

• Very high efficiency
• Good voltage regulation
• No waveform distortion
• Reliable and compact design
• High short time surge capacity
• Continuous, step less and smooth control of output