I have read all posts in the forums, but still can't see the visual of the requirements of surge suppression on interposing relays. My application is a 24VDC output from an AB controller to a 24VDC/120VAC interposing relay to drive a hydraulic solenoid valve. To simplify the question, I have attached a picture. Do I need surge suppression on the DC side only or both the DC and AC sides? Do I need anything else?