A fusible switch disconnect device comprising: a housing defining a first side, a second side opposing the first side and a receptacle adapted to directly receive and engage at least a portion of a removable fuse, the removable fuse including first and second terminal elements and a fusible element electrically connected therebetween, the fusible element defining a circuit path configured to operate according to a continuous time-current curve representing time-current conditions that the fusible element can actually be expected to withstand before permanently opening; a line side terminal and a load side terminal in the housing and electrically connecting to the respective first and second terminal elements of the fuse when the fuse is received and engaged with the housing, wherein the line side terminal includes a second stationary switch contact; line and load side fuse clips (760, 762) in the housing, wherein the line side fuse clip is formed integrally from a terminal member provided with a first stationary switch contact; first and second switchable contacts (780, 778) in the housing, the first and second switchable contacts (780, 778) mechanically coupled to one another and selectively positionable relative to the first and second stationary contacts (784, 766) between an open position and a closed position to respectively connect or disconnect an electrical connection through the line side terminal and the load side terminal and through the circuit path of the fusible element when the removable fuse is engaged to the line side and load side fuse clips (760, 762); an in-line current detecting element configured to detect current flow through the first and second switchable contacts (780, 778) and through the circuit path of the fusible element when the first and second switchable contacts (780, 778) are in the closed position, wherein the in-line current detecting element (830, 902) is integrally provided in the line side terminal; and a disconnect mechanism (774, 810, 812, 814) operable in a first mode and a second mode to displace the first and second switchable contacts (780, 778), wherein the first mode is manually operated and wherein the second mode is automatically responsive in a longer duration overcurrent event to an assessment of whether the fusible element is expected to withstand the detected current flow, wherein the assessment includes a time-based and magnitude-based comparison of the detected current flow relative to the continuous time-current curve of the removable fuse that is directly received and engaged in the housing. a housing defining a first side, a second side opposing the first side and a receptacle adapted to directly receive and engage at least a portion of a removable fuse, the removable fuse including first and second terminal elements and a fusible element electrically connected therebetween, the fusible element defining a circuit path configured to operate according to a continuous time-current curve representing time-current conditions that the fusible element can actually be expected to withstand before permanently opening; a line side terminal and a load side terminal in the housing and electrically connecting to the respective first and second terminal elements of the fuse when the fuse is received and engaged with the housing, wherein the line side terminal includes a second stationary switch contact; line and load side fuse clips (760, 762) in the housing, wherein the line side fuse clip is formed integrally from a terminal member provided with a first stationary switch contact; first and second switchable contacts (780, 778) in the housing, the first and second switchable contacts (780, 778) mechanically coupled to one another and selectively positionable relative to the first and second stationary contacts (784, 766) between an open position and a closed position to respectively connect or disconnect an electrical connection through the line side terminal and the load side terminal and through the circuit path of the fusible element when the removable fuse is engaged to the line side and load side fuse clips (760, 762); an in-line current detecting element configured to detect current flow through the first and second switchable contacts (780, 778) and through the circuit path of the fusible element when the first and second switchable contacts (780, 778) are in the closed position, wherein the in-line current detecting element (830, 902) is integrally provided in the line side terminal; and a disconnect mechanism (774, 810, 812, 814) operable in a first mode and a second mode to displace the first and second switchable contacts (780, 778), wherein the first mode is manually operated and wherein the second mode is automatically responsive in a longer duration overcurrent event to an assessment of whether the fusible element is expected to withstand the detected current flow, wherein the assessment includes a time-based and magnitude-based comparison of the detected current flow relative to the continuous time-current curve of the removable fuse that is directly received and engaged in the housing.