Depending on how you have the jumpers set, maybe. Basically, if you have a jumper somewhere on the A, B, or C contacts, you have anywhere from 5 seconds to 3 hours before it will send the shutdown signal to the motherboard. If there aren't any jumpers on there, it acts like a normal power supply (no delay). It is clearly explained on the pdf. Search google for "m2-atx pdf" and ye shall see!