Which timer type delays the activation of its output after energization?

• A. On-delay timer
• B. Off-delay timer
• C. Pulse timer
• D. Immediate timer

Answer: (A)

The main idea is a delay in turning the output on after the input becomes energized. An On-delay timer starts counting as soon as energization occurs, but the output stays off until the preset delay time has elapsed; only then does the output activate. This is exactly what you’d use when you want something to wait a bit before starting once the control signal is present.

In contrast, an Off-delay timer keeps the output on for a set time after the input goes off, not delaying the activation. A Pulse timer provides a short, fixed-duration output pulse rather than a sustained delay before activation. An Immediate timer would energize the output right away with no intentional delay.