The black color is a nice touch because it helps the relay blend into dark enclosures and backplanes.
Potter-Brumfield KHS17A11 Relay 120 Volt 50/60Hz 1/10HP 3A 120VAC w/ Base 6SED5
You can pair the UE10-3OS2D0 with compact panels, since the footprint leaves room for tidy wiring.