NEMA duplex motor controllers are used to control two motors and consist of two starters with separate disconnects in the same enclosure. An alternation circuit is included to equalize motor and pump wear, or to allow both motors to be run simultaneously.
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Digest 178 – NEMA and Definite Purpose Contactors and Starters
Motor Control, NEMA Products, NEMA Contactors, NEMA Starters – Definite Purpose, Duplex Motor Controllers, NEMA Overload Relays, Pump Panels, NEMA Contactors – Definite Purpose, Separate Enclosures / Replacement Parts, NEMA Contactors – Lighting, NEMA Contactors – Vacuum, NEMA Starters – Combination, NEMA Starters – Reduced Voltage, NEMA Starters – Vacuum, NEMA Starters/Protectors & Switches – Manual, NEMA Starters | Schneider Electric