How to Decode a Motor Nameplate (So You Order the Right Replacement)

A practical checklist for matching frame, voltage, phase, enclosure, and duty—without guessing.

*Replace the image URL above after you upload your hero image to WordPress Media Library.

Before you replace a motor, capture these from the nameplate:

• Voltage (V) + phase (1/3) + frequency (Hz)
• Full load amps (FLA) and service factor (SF)
• Horsepower (HP) or kW
• Frame size (e.g., 56C, 143T, 145T) and mounting
• RPM and number of poles
• Enclosure type (TEFC, ODP) and IP rating if listed

The most common replacement mistakes come from mismatched frame and mounting. Confirm:

• Shaft diameter + length + keyway
• Bolt pattern and face mount (C-face/D-flange)
• Base/foot mount vs face mount
• Rotation direction requirements

Need frame charts and tolerances? Go to Technical Data. Have an OEM number? Use Part Number Lookup.