This part is attached to the compressor. It helps the compressor kick on and off while maintaining a constant temperature to keep things frozen in your freezer.
It was very easy to remove the broken parts of the freezer door handle still secured by screws and then attach the new handle. However, I was shocked to find that the door handle screw cover plate was not included as part of the door handle replacement issued, which I felt was misleading. Fortunately that portion from my old broken handle was still intact, though is yellowed with age, so was able to snap that in place on the new partial-handle replacement which you sent. It seems to me that to omit this portion as part of the complete handle replacement didn't make much sense, as it rendered the new replacement handle incomplete.
This was a simple job. Raised the flap in the back that houses the compressor, removed the wire that holds the relay, pulled out the old relay and pushed the new one on. Replaced wire holder and that was it. Plugged it frig and freezer is at zero and lower compartment at 35. As easy as brushing your teeth!