If It's Blue, It Must Be...

Different colored marking plates—in yellow, green, orange, blue or white—are available to replace the standard marking plate on the top of the RU relay. The marking plates can be further identified by using either a pencil or pen to write directly on them. The marking plates are located on top of the relay, rather than on the socket, making them easy to see and write on. The marking plates are made of durable and long-lasting PBT resin and are easily interchangeable, the vendor says, because they simply snap on or off.