* if there is a short (eg. 1..3 seconds) power outage somewhat before the compressor would auto-OFF (pressure switch is still ON)

** the electric motor can (actually likely) burn. Very annoying, especially if multiple compressors are started from same pressure switch (which is not uncommon)

This is not a problem if the power outage is longer (say, 10 sec, enough time for relief from the small tube)

* or if power outage is short, but pressure switch is OFF (obviously)

Solutions:

* delayed startup

** either manual start, with simple self-holding relay circuit (so it's OFF right after power outage)

** or some electronic or processor delay (like arduino). With RTC (or better: network connection via NRF24L01 radio or serial link - possibly via BT or wifi adapter) can be programmed so it's off at night, or weekends

** maybe an USB-serial adapter in a TP-Link (openwrt) router (also useful as fileserver and printerserver) would be suitable to control the relay (TX, or the RTS signal can be switched from software); Requires some software (perhaps as in OverTCPWireless

just a ser2net autostarted after boot?) the relay-control HW would be trivial (and stateless) this way.

5V relay (eg. 230V, 10A) might be useful (usually a small PNP inside, activated by pulling input to GND)