What stands out about this heavy duty relay is the thicker terminals, which make wiring feel more secure overall.
SPRECHER + SCHUH CS4-40E-120 4 Pole NO, AC Relay 110 50Hz, 120V 60 Hz
A nice touch is the heavy duty rating printed clearly, so you know it is ready for demanding circuits.
This heavy duty relay has a satisfying heft, which makes me confident it will last through frequent use.