The electrorefining droid was a model of fifth-degree mining droid employed by the Techno Union to pan for melted ore in lava rivers on the planet Mustafar and carry it to central processing facilities. They were protected from boiling lava by heat resistant carbonite-alloy armor and energy shields.
- Star Wars: Episode III Revenge of the Sith (First appearance)
- Star Wars Builders: Droids
- Star Wars: The Visual Encyclopedia (First identified as electrorefining droid)