09
Timer-Controlled Bell
A bell or buzzer on a timed contact. The timer switch is an ordinary switch driven by a clock, which is why the bell sounds for a set period and then stops on its own.
Components Needed
Text Wiring Path
Live → MCB → Timer Switch → Bell → Neutral
Schematic
Steps
- 1Place a Live (L) terminal and a Neutral (N) terminal on the canvas.
- 2Place an MCB on the live side, then a Timer Switch to its right.
- 3Place a Bell as the load.
- 4Wire: Live → MCB → Timer Switch → Bell → Neutral.
- 5Press Run, then toggle the timer switch to stand in for the timed contact closing and opening.
- 6Select the timer in the Inspector to compare its weekly, staircase and countdown variants.
Key insight
A timer switch is a switch with a clock attached: it closes the live conductor for a set interval, then opens it. A bell is an intermittent load, so the timer is what stops it being left energised.
⚠ Safety practice
These walkthroughs teach wiring logic in a simulator. Real installation work must be isolated, tested dead, and carried out by a competent person — in the UK, notified under Part P or done by a registered electrician.
Terms used here
Defined in the glossary — each one opens at its own entry.
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