Abstract: An electrical switch apparatus suitable for isolating high voltage equipment and bus-bar systems in utility sub-stations. The switch apparatus comprises a pair of detachable couplers which are connected by a high voltage flex cable, and a pair of terminal adapters. The terminal adapters are connected to respective terminals of the bus-bar or other sub-station equipment. The terminal adapters each include a member for engaging one of the couplers and forming a conductive path between the terminals. To break the conductive path, one or both of the couplers are conveniently detached using a hook-stick. The switch apparatus is easily adapted to various spacings and provides a convenient replacement for conventional blade disconnect switches.