This is the delay, from -1 to 32767 seconds, after the UPS goes onto battery before a specific receptacle is automatically turned off, with -1 meaning it should never auto-shed and must be turned off only by explicit command; the description notes it is used to prioritize which loads shed first during a prolonged outage. It lets an admin design a load-shedding priority scheme so less-critical outlets drop before more critical ones, extending battery runtime for what matters most. For example, setting a lower upsRecepAutoOffDelay on the outlet feeding a break-room printer than on the outlet feeding the main database server ensures the printer loses power first in a long outage.