Built-in disconnector assembly for electronic limited slip differential device

A built-in disconnector assembly for an electronic limited slip differential device includes a shift guide sliding so that an outer case and an inner case of a disconnector device are fastened, a piston pressing a multi-plate clutch of the electronic limited slip differential (eLSD) device so that the multi-plate clutch enters an operation state, and a ball ramp operation unit rotated by a driving motor and sliding the shift guide and the piston toward the disconnector device, in which the ball ramp operation unit slides the shift guide to fasten the disconnector device and then is additionally rotated at a predetermined angle to slide the piston so that the eLSD device enters a fastened state.