A Control Transformer supplies power to control and / or auxiliary equipment not intended for direct connection to the main source. Control Transformers are specifically used to provide control supply voltage for the control circuits of AC motor starters i.e. starter coils, timers, indicating lamps electronics protection relays etc. Control Transformers for contractor applications have to energize the coils. It should have good regulation for surge current. Control transformers are mostly used for industrial applications where electromagnetic devices such as contractors, relays and solenoids are used. They are also used in less sensitive devices where accurate secondary low voltages are essential. The Control Transformer maximizes inrush capability and output voltage regulation when electromagnetic devices are initially energized. Control transformers are sometimes called Industrial Control Transformers, Machine Tool Transformers, or Control Power Transformers.
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