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3-Phase NEMA Frame General Purpose AC Motors

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Three-phase NEMA frame general purpose AC motors don't require starting capacitors, run capacitors, or centrifugal starting switches that can wear out and fail. Motors operate with a higher torque and greater efficiency than single-phase models of the same HP, rpm, and frame size. They have three-windings that create a naturally rotating magnetic field within the frame of the motor and are suitable for use in nonhazardous applications with pumps, ventilation equipment, machine tools, and other industrial equipment. Motors may have a single protrusion on the motor shell such as a conduit box that houses the electrical connections between the external power cables and the internal electrical wiring of the motor. They have NEMA frame construction with standard dimensions that allow drop-in replacement of motors from multiple suppliers with no modifications required to existing installations. The frame size for these motors is shown on the motor nameplate under “Frame” or “FR”.
Motor Service Factor

NEMA 48 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 48 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 48 frame three-phase general purpose AC motors have a standard 1/2" diameter, 1-1/2" length shaft whose center is 3" above the base mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

Open Dripproof with Rigid Base Mount

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Totally Enclosed Fan-Cooled with Rigid Base Mount

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Totally Enclosed Nonventilated with Rigid Base Mount

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NEMA 56 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 56 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 56 frame three-phase general purpose AC motors have a standard 5/8" diameter, 1-7/8" length shaft whose center is 3-1/2" above the base mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 56HZ or 56C. The letter “H” indicates that the frame has a set of mounting holes at 3" and 5", “Z” indicates that the frame has a nonstandard shaft, and “C” indicates that the motor can be face mounted. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 140 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 140 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 140 frame three-phase general purpose AC motors have a standard 7/8" diameter, 2-1/4" length shaft whose center is 3-1/2" above the base mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 143T or 145TC. The letter “T” specifies integral HP motor dimension standards set by NEMA in 1953 and 1964, and “C” indicates that the motor can be face mounted. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 180 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 180 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 180 frame three-phase general purpose AC motors have a standard 1-1/8" diameter, 2-3/4" length shaft whose center is 4-1/2" above the mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 182TC. The letter “T” specifies integral HP motor dimension standards set by NEMA in 1953 and 1964, “C” indicates that the motor can be face mounted. The combined suffix "CH" indicates that the face-mounting dimensions differ from frames with a "C" letter designation. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 210 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 210 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 210 frame three-phase general purpose AC motors have a standard 1-3/8" diameter, 3-3/8" length shaft whose center is 5-1/4" above the mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 213TCV. The letter “T” specifies integral HP motor dimension standards set by NEMA in 1953 and 1964, “C” indicates that the motor can be face mounted, and “V” indicates that the motor can be vertically mounted. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 250 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 250 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 250 frame three-phase general purpose AC motors have a standard 1-5/8" diameter, 4" length shaft whose center is 6-1/4" above the mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 256TC or 254/6U. The letters “T” or “U” specify integral HP motor dimension standards set by NEMA in 1953 and 1964, and “C” indicates that the motor can be face mounted. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 280 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 280 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 280 frame three-phase general purpose AC motors have a standard 1-7/8" diameter, 4-5/8" length shaft whose center is 7" above the mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 286TSC. The letter “T” specifies integral HP motor dimension standards set by NEMA in 1953 and 1964, “S” indicates a standard shorter shaft for direct-drive applications, and “C” indicates that the motor can be face mounted. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 320 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 320 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 320 frame three-phase general purpose AC motors have a standard 2-1/8" diameter, 5-1/4" length shaft whose center is 8" above the mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 326TSC. The letter “T” specifies integral HP motor dimension standards set by NEMA in 1953 and 1964, “S” indicates a standard shorter shaft for direct-drive applications, and “C” indicates that the motor can be face mounted. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 360 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 360 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 360 frame three-phase general purpose AC motors have a standard 2-3/8" diameter, 5-7/8" length shaft whose center is 9" above the mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 364/5TSC. The letter “T” specifies integral HP motor dimension standards set by NEMA in 1953 and 1964, “S” indicates a standard shorter shaft for direct-drive applications, and “C” indicates that the motor can be face mounted. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 400 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 400 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 400 frame three-phase general purpose AC motors have a standard 2-7/8" diameter, 7-1/4" length shaft whose center is 10" above the mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 404TS or 405TC. The letter “T” specifies integral HP motor dimension standards set by NEMA in 1953 and 1964, “S” indicates a standard shorter shaft for direct-drive applications, and “C” indicates that the motor can be face mounted. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).

NEMA 440 Frame 3-Phase NEMA Frame General Purpose AC Motors

NEMA 440 Frame 3-Phase NEMA Frame General Purpose AC Motors
NEMA 440 frame three-phase general purpose AC motors have a standard 3-3/8" diameter, 8-1/2" length shaft whose center is 11" above the mounting surface. Variations to the frame's standard dimensions and design are indicated by a letter designation following the frame number, such as 444TS. The letter “T” specifies integral HP motor dimension standards set by NEMA in 1953 and 1964, and “S” indicates a standard shorter shaft for direct-drive applications. These frame standards and letter designations are defined by the National Electrical Manufacturers Association (NEMA).
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