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Do I need to add a Suppressor to an XT contactor with a DC coil?

No, all IEC rated, XT contactors with DC coils have a suppressor built in to prevent the contactor's coil from disturbing the DC rail when opening and closing the contactor.

 

However, if there are highly sensitive loads sharing the DC rail, you can add an additional suppressor, XTCEXDSB, though this only fits the B frame contactors.