A one button reset spec'd. I would likely just bring the safeties into a PLC and have the one button reset to come into the PLC as well. Then I would back up that series of botd's with multiple other safeties in the logic.
What about letting it alarm out - Freezestat/Powerfail Alarm Requires Manual Reset!
Not ideal I know, but how often do they have power bumps? Don't know your climate, but this may/may not be acceptable in case of a long weekend.
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BIG Government = More Dependents
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Would a latching relay be an option? Like flyin90 says could you explain the circuit more in detail or maybe show a drawing so everyone can help you further.
50 & 60 hz but 100's worse
Omron makes some small self-powered time delays that will continue to operate for up to 10 minutes without any power on them. They work very well.
This sounds like the ticket if it fits the application. I have used them but did not know who made them.
Originally Posted by JRINJAX
A better UPS will resolve the problem.
Make sure that auxillary transformers (if used for this circuit) are on the UPS power. Often I will find the DDC control cabinet on UPS power but not the external devices.
Originally Posted by lumpsum