I have a DS-7608NI-K2-8P & 6DS-2CD2345FWD-I 4mm 4MP cameras, it is about 3 years old.
Last month the RCBO tripped & I worked out the PSU had failed, I couldn’t locate another so I ordered a replacement NVR. Time was tight to setup the new NVR so I took the new PSU out & put it in my old NVR...