NEMA MG-1 defines 10 pole characteristics for 60 Hz Design A and B motors but not for 50 Hz slower than 8 pole. Your supply frequency would determine who is technically correct in their interpretation of NEMA.
Depending on the need for a fast response to overheating, I would take another look at RTD's, thermistors or bimetallic switches which can be purchased to respond to the maximum temperature you want to winding to reach. This temperature can be below the temperature rating of the insulation...
This motor according to some of the older hands at Baldor is a Repulsion start/Induction run motor that hasn't been made since the 50's.
The information on this product line is sketchy because of the age of the motor. This would also put it into a pre-NEMA frame which would mean the motor is...
