What is true about contacts that are connected by dashed lines on a ladder diagram?

• A. They are in parallel with each other
• B. They are separate switches
• C. They are always normally open
• D. They are part of the same physical switch

Answer: (D)

Contacts that are connected by dashed lines are part of the same physical switch or relay. The dashed line shows a mechanical linkage, meaning all those contacts share one actuator and will change state together when that device is operated. This is why they are treated as a single multi-pole device, like a relay with multiple contacts or a multi-pole switch. The dashed linkage doesn’t fix the electrical arrangement (they can be normally open or normally closed), nor does it indicate parallelism or that they are separate switches.