The recloser should react fast to mitigate the impact of a temporary fault. This is dependent on its fast-operating time design. Time dial (TD) and pick up (PU) settings need to be chosen optimally to assist the recloser response. In a passive distribution system (DS), this is easily achievable but the generators’ connections to the system changes the response time. This is because the inverse time–current characteristic of the relay recloser utilizes depends on fault current magnitude. The connection of a distributed generator can either increase or decrease this magnitude depending on the direction of the current. Therefore, this study is done on the response of the recloser relay to temporary faults in an active DS and aims to determine settings that are optimal to clear the fault quickly. It tests the suitability of using modified Differential Evolution Algorithms to determine the settings of TD and PU values. MATLAB/Simulink is utilized for simulations. Obtained results show a reduction in the fast-operating time as a result of applying one of the designed schemes, this should reduce the time for manual selection of the settings if the fault current changes.