A fusible disconnect switch device comprising: a nonconductive switch housing including a plurality of orthogonal sides and configured to removably accept a cylindrical overcurrent protection fuse ; a first fuse contact member and a second fuse contact member coupled to the nonconductive switch housing , each of the first fuse contact member and the second fuse contact member configured to engage and complete an electrical connection through the overcurrent protection fuse , wherein the first fuse contact member is rotatably mounted to the nonconductive switch housing ; at least one movable switch contact in the nonconductive switch housing positionable between open and closed positions to respectively connect or disconnect the electrical connection between the first fuse contact member and the first fuse terminal and through the overcurrent protection fuse while the fuse is engaged to the first fuse contact member and the second fuse contact member ; and a rotary actuator coupled to the nonconductive switch housing and configured to move the at least one movable switch contact between the opened and closed positions; characterized in that ; the fist fuse contact member is selectively positionable with respect to the overcurrent protection fuse , and the first fuse contact member comprises a planar conductive contact having a circular periphery and a pair of protruding keyed ribs extending from the circular periphery wherein a line-side terminal and a load-side terminal are exposed on and accessible from a common one of the plurality of orthogonal sides to establish an electrical connection to an external circuit. a nonconductive switch housing including a plurality of orthogonal sides and configured to removably accept a cylindrical overcurrent protection fuse ; a first fuse contact member and a second fuse contact member coupled to the nonconductive switch housing , each of the first fuse contact member and the second fuse contact member configured to engage and complete an electrical connection through the overcurrent protection fuse , wherein the first fuse contact member is rotatably mounted to the nonconductive switch housing ; at least one movable switch contact in the nonconductive switch housing positionable between open and closed positions to respectively connect or disconnect the electrical connection between the first fuse contact member and the first fuse terminal and through the overcurrent protection fuse while the fuse is engaged to the first fuse contact member and the second fuse contact member ; and a rotary actuator coupled to the nonconductive switch housing and configured to move the at least one movable switch contact between the opened and closed positions; characterized in that ; the fist fuse contact member is selectively positionable with respect to the overcurrent protection fuse , and the first fuse contact member comprises a planar conductive contact having a circular periphery and a pair of protruding keyed ribs extending from the circular periphery wherein a line-side terminal and a load-side terminal are exposed on and accessible from a common one of the plurality of orthogonal sides to establish an electrical connection to an external circuit. <EOS>