You need to look on your motor casing and see what the rating is in terms of voltage, expressed as V., RPM, or revolutions per minute, and horsepower. If you have a 110-115 V one-third or one-half horsepower motor, which is what most Craftsman motors are, it should be easy to find a replacement and take the old one off and replace it with a new one. I will check back and see if this helps.
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Rarely you can get a motor that burns up because of bad internal parts and sawdust can lead to problems but motors are designed to handle and placed on the saw in a position to avoid heavy sawdust buildup. In my experience at my repair shop, most table saws that come in for motor repairs are directly attirbutable to using dull blades and making up for that by forcing the work through the saw. If you have a good quality, sharp/new blade and feed the wood into it at a reasonable rate, even a weak motor can get the job done.
The brake on electric motor driven tools is the field & armature. When running the switch provides power to both sides/poles of the field through the brushes and armature. When you release the switch half of the field is powered pulling the armature to a stop. If your bladed continues to spin when the switch is released, you need to replace the switch. The Ridgid part number for the proper switch is 503317000.
You may have a motor winding lead that has touched the case of the motor, shorting out the windings, drawing too much amperage, thus blowing fuses. You may have to disassemble your motor and check the stator windings for a short as well as the armature windings. Also the motor could be hanging up due to bearing trouble and causing the motor to draw too much amperage. Probably the cheapest thing to do would be to replace the motor.
First of all, how did you determine that power was getting to the motor? If you can test for power with a voltmeter at the motor connections themselves and show power then the switch is OK and the circuit breaker is not tripped. Turn off power and attempt to turn the blade " CAREFULLY" and if it moves easily then the motor is probably defective and will have to be replaced. After turning the motor and finding it easy to turn, then turn the power back on and try to start the saw again. Be carefull because the saw may start. If the blade will not turn then the motor is definitely defective and will have to be replaced.
You can try Sears but they can be a bit pricey. I use to send out motors for a factory I worked in to a rebuilder who would even do new windings. Check in your area for a rebuilder, As for the replacement being a Sears unit they may have a similar motor in stock. Good luck.