Abstract: A power transmission safety system is disclosed having a pair of power transmission members, each of the power transmission members having a switch arm. Each of a pair of switch arm engaging members reversibly engage a switch arm of its respective power transmission member. Each of a pair of pivoting shaft members are coupled to a respective one of the pair of switch arm engaging members on one end, and a rotatable handle on an opposing end. An interlocking power activation bar has a pair of openings located thereon, whereby rotation of one of the pivoting shaft members engages a switch arm of a respective circuit breaker into an “on” position and displaces the interlocking power activation bar to lock the other of the shafts from rotating, thereby preventing both of said power transmission members from being “on” concurrently.