As shown in the illustrated two speed motor controller, how is simultaneous energization of both contactors prevented? See illustration EL-0169.

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Accepted Answer

electrical interlocking with the normally closed low speed and high speed contactor auxiliary contacts and the normally closed low speed and high speed start pushbutton contacts

Answer

electrical interlocking with the normally closed low speed and high speed contactor auxiliary contacts only

Answer

electrical interlocking with the normally closed low speed and high speed start pushbutton contacts only

Answer

mechanical interlocking with the low speed and high speed contactors only

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