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We have investigated the effect of temperature and bias current on the stability of the inverse spin-switch effect in Permalloy(Py)/Nb/Permalloy pseudo spin-valves. The inverse spin-switch operates between two orientations of the ferromagnetic moments of Py layers; parallel (ON) and antiparallel-domain (OFF) state. Measuring time scans of the resistance changes between the ON and OFF state, ΔRON-OFF, while alternating magnetic fields between the two states at various temperatures and bias currents, revealed that enhancement of ΔRON-OFF is a key factor to achieve successful operation of superconducting spin switch.