A manual disconnect for an electric circuit includes a base with primary terminals and an interlock connector. A plug assembly has fuse terminals and an interlock resistor assembly. The plug assembly is adapted to be moved relative to the base between a disconnected position, a primary circuit engaged position, and an interlock position. The plug assembly is moved linearly and rotationally relative to the base when moving between these positions. The manual disconnect also includes a connector position assurance assembly. The connector position assurance assembly includes a connector position assurance button that is movable relative to the plug assembly. The connector position assurance button can be moved between a pre-lock position and an assurance position. When located in the assurance position, the connector position assurance assembly prevents the plug assembly from rotating relative to the base.