Another consideration is the lifetime of the breaker. It is designed to provide a safety function, to break the circuit under abnormal conditions of excessive load, not for routine operation.
Motor connection circuits normally use these in conjunction with a contactor, for the reasons in J. Raefield's answer (especially NVR - No Volt Release - the undervolt protection he mentions).
As a result of this, the contactor is expected to perform the main switching, and is rated for many operations, while the breaker may only be rated for a relatively small number of operations. Whether this applies to the pictured one I can't say, but the relevant information will be in its datasheet. If in doubt, link to the datasheet in the question.
It is also very useful to have a second means of breaking the circuit for that surprising moment when the first one's contacts weld themselves shut!
So check the breaker's datasheet very carefully before you design it into your circuit as the main switching mechanism. Or follow conventional practice and use a contactor too.