A manual disconnect for an electric circuit includes a base with primary terminals and an interlock connector. A plug assembly includes fuse terminals and an interlock resistor assembly. The plug assembly is movable relative to the base between a disconnected position, wherein the fuse terminals are not engaged with respective primary terminals, and a primary circuit engaged position, wherein the fuse terminals are engaged with respective primary terminals. The plug assembly is also movable to an interlock position, wherein the interlock connector is engaged with the interlock resistor assembly. The plug assembly is moved in an insertion to move the plug assembly from the disconnected position to the primary circuit engaged position, and is rotated about an axis to move from the primary circuit engaged position to the interlock position.