NEC Level 4 Practice Test

The off-delay relay is specifically designed to provide a time delay after the relay has been de-energized. This means that once the control signal is removed, the relay does not immediately turn off; instead, it remains energized for a predetermined period, allowing connected devices to continue operating for that delay time. This feature is particularly useful in applications where there is a need to keep a load energized for a brief period after the controlling input has ceased, such as allowing motors to coast to a stop rather than shutting off abruptly.

In contrast, other options suggest that the delay occurs when the relay is energized or immediately upon activation, which does not accurately describe the function of an off-delay relay. It is essential to understand the operational characteristics of these relays to effectively apply them in practical scenarios.