🔍 Key Concepts

• Sliding electrical contacts in marine switches and breakers • Difference between butt contacts and self-wiping contacts • How contact motion can affect cleanliness and reliability

💭 Think About

• When two contacts slide against each other as they open or close, what happens to any dirt, oxidation, or film between them? • Which term describes a contact design where movement intentionally scrapes or wipes the surface? • Do the options describe different things, or can more than one option be true at the same time?

✅ Before You Answer

• Identify which option specifically describes sliding or wiping motion in contact design • Decide whether butt joined contacts move past each other or simply meet face-to-face • Check if the sliding action would clean the contact surface as part of its design purpose