Is there a Thermal Relay in a DOL starter for "staircase pressurization fan"?
When motor overload happens,will the Thermal Relay cut off the contactor?
In a Direct On Line starter, your only real protection is thermal via the overloads at the base of the contactor.
This should by rights open the control circuit and shut everything off, unless it has been poorly designed or wired.
This is first year apprentice stuff, why do you ask?
Let's face it, these days if you're not young, you're old - Red Green