The capacitor function is to stabilize power. If there is an abnormal draw or overload, better having the capacitor installed (part 17 on diagram below), rather that relying on the overload (part 13 on diagram below).
Moreover the overload is fully functional only when the motor is started, and it will not prevent damage to relay on startup.
The best soloution is installing the optional capacitor, even if the overload can do same function of capacitor, the capacitor may prevent damage to overload or relay in case of abnormal draw.
Here the diagram:
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