It's not like mine, I have separate 20amp breaker for each compressor.
I would not think the way yours is would be safe. You would have 20amp wiring protected by a 50amp breaker.
Maybe your 2nd compressor is on one of the other 20amp breakers, just not marked as such.
My 2 50 amp breakers are ganged.
Dan & Sharon (Zena-Our Yorkie Puppy)(Kasey-Our Yorkie Puppy RIP 9Jan05-26Jul17) On the Road (2012 Journey 36M, 2020 Chevy Equinox)
USN-Ret ('65-'93) Fulltimers, Class of 2012