#Looking for a sensor that can respond to a relay closure

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wheat vapor
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I have a scenario where I need to detect a voltage drop on a 5v dc system. ( I want the reliability and ease of use of an off the shelf sensor.
I know this can be done with ESPHome but that is not what I want.) Are there any sensors with contacts (sometimes called dry contacts) that
trigger when the contacts are shorted e.g. by an external relay?

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i found one. Fibaro Smart Implant (FGBS-222)