The Update Breaker Database command is used to update the database of breaker and fuse curves used for selective coordination. This command guarantees you will have the most complete list of breakers and fuses.
To update the breaker database, go to
Ribbon: DM Electrical->Utilities-> 
->Update Breaker Database
Pulldown Menu: DM Electrical->Utilities->Update Breaker Database
The breaker database will be updated. A Design Master Electrical dialog box will appear confirming the update was successful.
Generally, this command does not need to be run. The breaker database is automatically updated once each day that a command attempts to access it. You should only need to run this command if you need immediate access to curves that have been added to the breaker database since the last automatic update.