Which device is commonly used to reset or stop a held output in a seal-in circuit?

• A. a stop pushbutton
• B. a reset timer
• C. a latching relay
• D. a reverse switch

Answer: (A)

In a seal-in circuit, once the output has been energized, it stays on by feeding its own holding contact to keep the coil energized even after the start control is released. To stop that held state, you need a device that breaks that holding path. The stop pushbutton, normally closed, sits in the holding circuit so that pressing it opens the circuit, the coil loses power, and the latch is released. This provides a quick and reliable way to reset the held output. A reset timer wouldn’t directly interrupt the latch, a latching relay is what creates the hold rather than stops it, and a reverse switch isn’t used to stop the held state in this configuration.