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AC and DC Ratings for Low Voltage Control

A full list of the various categories of AC and DC ratings can be found in Eaton's IEC Contactors and Starters catalog, volume 5 tab 1 in the Technical Data section.

http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/vol05_tab01.pdf#page=249

 Category Typical Application
AC-1Non-inductive or slightly inductive loads, resistance furnaces
AC-3Squirrel cage motors: starting, switching off motors during running
DC-1Non-inductive or slightly inductive loads, resistance furnaces
DC-3Shunt-motors: starting, plugging 2, inching 3, dynamic breaking of motors