The first thing that comes to mind are the small relays used for gate & DZ on Motion 2000 hydros and in the rope gripper circuit on Motion 4000 traction. They seem to have an abnormally high failure rate. I think they originally came with the orange Schrack RTE24615. They also use Black Omron G5RL-1-E-AC120, this is what we have been using but they don't seem to be any better. I have also seen White ones but didn't notice the brand. They are 120vac.