A(n) ________________________ timer relay starts timing when the pushbutton input is first pressed.

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

Answer: (B)

When a timer starts counting as soon as the input is applied, you’re dealing with an on-delay timer. Energizing the pushbutton sends power to the timer, beginning the countdown. The output switches only after the programmed delay has completed, which is exactly what happens when the input is first pressed.

In contrast, an off-delay timer starts counting after the input is removed, so the timing begins when you let go of the button. A pulse timer produces a single timed output pulse after a trigger, not a continuous delay. An immediate-action timer has no delay at all—its output responds right away when the input is applied.