Motor Starting Autotransformers

Hammond's motor starting autotransformers have been an industry standard for many years. Our 2909 and 3009 series product lines are designed for medium duty service and are manufactured in accordance with NEMA standards. We offer both three phase two coil and three coil units available in ratings from 25HP to 1600HP.

2909 Series Motor Starting Autotransformers

These three phase, 2 coil motor starting autotransformers are suitable for motor starters with 2 contacts, connected in open 'V' configuration. Phase voltage across the open 'V' tends to be slightly out of balance when compared to the other two phases. The 2909 series are available for motor horsepower ratings from 20HP to 1600HP.

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3009 Series Motor Starting Autotransformers

These three phase, 3 coil motor starting autotransformers are suitable for motor starters with 3 contacts, connected in a 3 phase 'Wye' configuration. This provides balanced voltages across each phase. The 3009 series are also available for motor horsepower ratings from 20HP to 1600HP.

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Custom/Specialty Motor Starting Autotransformers

For applications requiring heavy-duty service with frequent starts or jogging, high inertia loads such as paper or steel mill drives, medium voltage or other unusual demands, Hammond can offer specially designed units to meet your requirements.

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