🔍 Key Concepts

• Difference between normally open (NO) and normally closed (NC) contacts in their rest position • How a momentary pushbutton is shown in schematics (actuator line above the contact) versus a maintained switch • In symbol "2", notice whether the contact is shown as open or closed before the button is operated

💭 Think About

• Look closely at the contact in symbol 2: in its normal, unpressed state, is the circuit path complete or broken? • Ask yourself: does the extra line above the contact indicate a pushbutton that returns when released (momentary), or a selector/maintained type device? • Compare symbol 2 with symbols 1 and 3: how do they differ in the way the contacts are drawn, and what does that tell you about normal state and operation?

✅ Before You Answer

• Verify whether the contact in figure 2 is open or closed in the normal (unoperated) position • Confirm that the symbol includes the pushbutton operator line, which indicates a momentary device • Make sure your choice’s wording (NO/NC and momentary/maintained) matches both the normal contact state and the type of operation shown in the symbol