Delay on break timer. Knob adjusts delay from .03-10 minutes. 18 - 240 volt Prevents your a/c from coming back on for a set period of minutes in case of a break in power. The break could save your compressor from burning out. Replaces 025-31418-000. Also replaces Diversified AC-503, Mars 32392, Robertshaw 3310-072, Supco TD-73, Gemline 1C320, Hitech HI-830 & Watsco EAC-505.