It was by chance that there was brush protection is activated an automatic stop when the brush just by chance is too short.

David, I do not believe planer has a fuse or reset, check power cord for damage,melting,breaks, especially at plug and where cord enters body or switch, check switch, check brushes. If you can smell motor and it smells burnt, then motor is quite likely burnt out and will need replaced.
Check the attached links,instruction and guides, Good luck
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Ryobi AP 10 Planer Parts
How to Check an Electric Motor
How to Diagnose Bad Cord or Power Switch

Check the motor for a thermal over load button
to stop it over heating take more lighter cuts as the motor is a small motor compared to what the cut can be