Abstract: Undervoltage is still a power quality problem globally with several interventions like reactive power compensation in generation stations, transmission, and distribution lines. This issue still prevails in Ugandas power system network that has experienced five blackouts within five months in 2020. Most utility companies have resorted to automatic under voltage load shedding schemes as a safety net to mitigate undervoltage. This study purposely sought to develop and implement an automatic undervoltage load shedding relay in Physical Security Information Management (PSIM) software for mitigation of undervoltage in the distribution network. The study specifically was to design part of Uganda power system distribution network in DIgSILENT, develop an automatic undervoltage load shedding relay and lastly validate the undervoltage load shedding relay solution. The modelled network showed a percentage voltage deviation that was within the acceptable error margin.