What term describes the rubbing motion used to keep relay contacts clean?

The term that describes the rubbing motion used to keep relay contacts clean is "contact wipe." This action occurs when the contacts of a relay come together and slide slightly against each other before fully closing. This sliding motion helps to remove any oxide buildup or contaminants that may have accumulated on the contact surfaces, ensuring a good electrical connection. A clean contact surface is crucial for reliable operation in electrical circuits, preventing arc formation and ensuring the longevity of the relay.

Other terms mentioned, like contact bounce and contact wear, refer to different phenomena. Contact bounce typically describes the rapid opening and closing of contacts upon closure, which can cause electrical noise and signal issues. Contact wear refers to the degradation of the contact surfaces over time due to repeated mechanical and electrical stresses. Contact break generally indicates a situation where the contacts are intentionally opened, which is not related to the cleaning action performed during operation.