🔍 Key Concepts

• Review the difference between normally open (NO) and normally closed (NC) contacts in schematic symbols. • Understand how a limit switch actuator is shown, usually with an angled or triangular symbol attached to the contact. • Note that a plain NC contact symbol is different from a mechanically actuated NC limit switch symbol.

💭 Think About

• Look at which symbols include a small triangle or actuator mark and decide which of those indicates a limit switch instead of a generic contact. • Among the limit-switch-style symbols, determine which one shows the contacts touching in the normal (unactuated) position and opening when actuated. • Compare the symbol that looks like a basic NC contact with those that show mechanical actuation—ask which best matches a limit switch rather than just a relay contact.

✅ Before You Answer

• Be sure the symbol you pick shows mechanical actuation (a cam/lever/triangle) typical of a limit switch. • Confirm that in the normal (not actuated) position, the contacts are closed (connected) for a normally closed device. • Verify that options which look like capacitors or non-contact devices (diamonds or plates) are eliminated from consideration.