🔍 Key Concepts

• Identify what kind of device figure A is (mechanically actuated limit switch vs. pressure/temperature/flow device). • Match the device’s mechanical actuator (roller/lever/plunger) to the way it is drawn in the schematic options (look at the symbols that show a mechanical operator). • Notice whether the switch appears to be normally open or normally closed and find a symbol that shows that same normal state.

💭 Think About

• Looking at figure A, what physical part actually moves when something contacts this device, and which schematic symbols show a similar style of mechanically operated switch? • Which of the numbered symbols clearly represent a single-pole switch with a mechanical operator, rather than a pressure, temperature, or proximity-type sensor? • If the switch in A were not being actuated, would its contacts be open or closed, and which symbol’s contact position matches that "at rest" condition?

✅ Before You Answer

• Be sure the symbol you select shows a mechanical actuator (lever/roller or plunger), not a pressure bellows, diaphragm, or proximity sensor. • Confirm the chosen symbol represents a single-pole switch (one moving contact) just like the device in A. • Verify that the normal contact position (open or closed) in the symbol matches how the limit switch in A would be when nothing is pressing on its actuator.