Mellor Electrics - RS DC Series Motors. RS series of DC permanent magnet field motors with carbon brushes. These efficient, high quality motors are suitable for continuous operation and can be supplied on their own or fitted with a wide range of gear boxes. Carbon brushes Hardened steel shaft Lubricated for life sintered bearings Life up to 3000 hrs - depending on usage Terminated to solder tabs Fitted with internal suppression to meet EMC directives