One method of de-energizing a seal-in circuit is to use...

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Multiple Choice

One method of de-energizing a seal-in circuit is to use...

In a seal-in circuit, the coil stays energized by its own contact, creating a latch that keeps the circuit on after the start action. To de-energize, you need a device that breaks that holding path in series with the coil. The stop pushbutton fits perfectly because it is normally closed and, when pressed, opens the circuit, cutting power to the coil and releasing the latch to stop the circuit. A normally open pushbutton wouldn’t interrupt the held path once the circuit is energized, so it isn’t suitable for stopping. A timer relay could change timing but isn’t the direct method to immediately de-energize a latch. A fuse would remove power but isn’t a controlled control device and isn’t used to intentionally stop a seal-in circuit.

In a seal-in circuit, the coil stays energized by its own contact, creating a latch that keeps the circuit on after the start action. To de-energize, you need a device that breaks that holding path in series with the coil. The stop pushbutton fits perfectly because it is normally closed and, when pressed, opens the circuit, cutting power to the coil and releasing the latch to stop the circuit.

A normally open pushbutton wouldn’t interrupt the held path once the circuit is energized, so it isn’t suitable for stopping. A timer relay could change timing but isn’t the direct method to immediately de-energize a latch. A fuse would remove power but isn’t a controlled control device and isn’t used to intentionally stop a seal-in circuit.

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