When START is pushed and released, what happens first in the circuit with TR as an ON-Delay Relay?

When the START button is pushed and released in a circuit with an ON-Delay Relay (TR), the first action that occurs is the de-energizing of M2. This happens because the relay is designed to create a time delay before energizing the next components in the circuit, while ensuring that M2 is not inadvertently left energized.

In this scenario, an ON-Delay Relay typically has a delay period that must elapse before M1 or M2 can respond to the start signal. As the START button is momentarily pressed, it activates the relay circuit, but in the initial moment after releasing the button, all connected loads, including M2, are temporarily in a state where they must comply with the relay logic. If M2 is designed to be de-energized when the system first begins its cycle, then that is the immediate action upon the release of the START button.

Understanding this functionality helps clarify the sequential control of components in an electrically managed system, emphasizing that with an ON-Delay Relay, the output states are not adjusted instantaneously; rather, they follow the programmed delays in the circuit's design.