Depends on how you define "circuit breaker" and "stationary power tool".
I have seen a lot of stationary tool motors (always single phase) that
have thermal overloads built into them. Motor gets hot, switch opens.
Motor cools off, it closes, motor starts again (if it's on a manual
switch). Then again, I've seen a lot that don't have any overcurrenet
protection built in, either. Delta R/I motors installed in vintage
Unisaws and other commercial/industrial woodworking equipment come to
mind.
Motor starters, on the other hand usually always have overload
protection of some kind built in. They are built to sense overcurrent
(usually by thermal means) and will shut the motor down, where it will
remain shut down until manually reset.
Ronnie Day wrote:
> AFAIK, all motors in stationary power tools have built-in circuit
> breakers in any case.
_______________________________________________
Shop-talk@autox.team.net
Donate: http://www.team.net/donate.html
Suggested annual donation $12.96
Archive: http://www.team.net/archive
Forums: http://www.team.net/forums
|