One method of deenergizing a seal-in circuit is to use ______.

• A. a stop pushbutton
• B. a reset switch
• C. a limit switch
• D. a timer

Answer: (A)

A seal-in circuit keeps the coil energized after the start button is released by using a holding contact that closes in parallel with the start control, creating a latch. To deenergize, you must break that holding path. The stop pushbutton does exactly that: it’s normally closed and placed in the holding circuit so that pressing it opens the circuit, cuts power to the coil, and releases the latch. Other devices don’t serve this primary interrupt function in a standard seal-in setup—reset switches typically reinitialize after a stop, while limit switches and timers are used for sequencing or control purposes and don’t reliably break the holding path by themselves.