Emergency disconnect
From The Stargate Omnipedia
Inadvisable procedure during which the S.G.C. is terminated of all power via breakers on sub level 28. Electricity is cut to the levels of the facility as well as the Stargate, terminating the wormhole.
KEY EPISODE
Entity - During the intrusion of an alien entity, General Hammond orders emergency disconnect to prevent more of it from piggybacking an outgoing wormhole.