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John asked What type of circuit do I need to make a light bulb turn off if any component of a fan fails?
I am trying to start some seedlings indoors before the growing season begins. I have a high temperature grow light for this purpose, one that requires a fan running to avoid combustion temperatures. What type of circuit do I need so that if any component of the fan fails, the light bulb will automatically turn off?
And got the following answer:
Three ways. First is a vane switch, which senses the airflow being generated and closes a switch when adequate flow is reached. If flow diminishes, it springs open. You may need a relay to control the lamp, or run a trip circuit. Second is a rotation sensor on the fan motor. Most DC brushless fans have a sensor, some with a sense line out, or easily added. That feeds signal to a timer circuit that the rotation sensor keeps at bay. If the rotation slows down or stop, it trips the timer, which trips the lamp off. Third is a thermal sensor fixed to the lamp electronics or housing, chosen of configured so that an overheat opens current to the lamp or its control circuit.