As utilities modernize their distribution systems to include wider use of advanced distribution automation (ADA) schemes, they need to assess the relevant distribution circuit configurations and reconfiguring capabilities, including the associated control and protection systems. The simulation of these ADA schemes along with the associated control systems overlay can lead to a better understanding of the value of these emerging capabilities and the ways they can be most effectively used. This panel presentation summary discusses using the control system overlay feature of an open-source distribution system simulator for modeling distribution automation schemes.