There are occasional inquiries about how to turn on an Accessory for, say, 30 seconds in response to a momentary push-button. This might be a show or open-house where an accessory-rich layout would be too "busy" if dozens of accessories are simultaneously flashing, spinning, whirring, etc. There's also the audience participation benefit especially with kids getting to control the action! There are of course time-delay relay modules but they can be spendy.
With the delay board under discussion, all you need is a momentary push-button (door bell) switch installed in place of an insulated-rail section! Now when a kid presses the button, it fires the corresponding relay for some settable interval with 10 Amp power handling capability.