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. |
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