The black color gives it a neutral presence that doesn't fight with your wire colors or labels.
AGASTAT 7012ABM Time Delay Relay 120V 60 Hz 0.5-5 Sec New Open Box
You will find that Miniduino relays fit standard layouts, which makes troubleshooting a bit less stressful.
Many users say the pin style relay feels familiar, and that confidence matters during quick fixes.
You will find that the Potter & Brumfield sits flat, with even gap on the plastic housing.
What stands out about this unbranded relay is that the pin layout is printed right on the top for quick reference.