In a timing relay system, what is the primary function of an Off-delay timer?

In a timing relay system, the primary function of an Off-delay timer is to maintain the output energized for a predetermined time after the control signal is removed. This means that when the power to the timer is cut off, the timer will keep the load activated for the specified duration before it eventually turns off.

This feature is essential in applications where you want to ensure that machinery or equipment continues to operate for a short time after the control signal ends, allowing for processes like cooling down or completing an operation without abrupt stops. The Off-delay timer is commonly used in scenarios such as ventilation systems, where equipment needs to run for a short while to ensure proper air circulation after the main system has been turned off.

Other options highlight different functions that do not align with the behavior of an Off-delay timer. For example, delaying activation after power is applied describes an On-delay timer, while controlling load operations over varying time intervals suggests a more complex timing setup not specific to the Off-delay function. Lastly, providing a one-time output pulse is characteristic of a pulse timer, which serves a different purpose entirely.