MOTOR STARTING AUTOTRANSFORMERS

​​Product Scope

• 25 to 1600 HP
• 240, 480 , 600, 2400, 4160 volts
• 2 and 3 Coil
• Many units in stock
• ​Rewind your old unit

​We stock, rewind, and build custom three phase 2-coil and 3-coil autotransformers. Commonly used to protect against over voltage and under voltage in motor starting applications. 

2-Coil designs are for motor starters with 2 contacts in an open delta configuration. Phase voltages across the open delta will be slightly out of balance with the other two phases using a 2-coil autotransformer.

3-Coil autotransformers are for motor starter with 3 contact connected in a three phase wye configuration. The 3 coils provide balanced voltages across phase.