Deltrol 275F Series Flange Mount Power Relays. Deltrol 275F series general purpose plug-in relays. The 275F series feature a coil moulded in Rynite PET and a clear plastic flange mount housing for environmental protection. Features and Benefits. 35 A switching capability. Flange mount housing. AC and DC coil options available. Silver cadmium oxide contacts. RoHS compliant