2 is in
Well said Marvin - thank you!
The EFII Bus Manager is capable of providing a Main Bus for non-critical systems as well as an Essential Bus for critical systems.
If you want to use Klixon breakers to split out power to your non-essential aircraft systems, the Bus Manager is all you need.
If you want the function of the VPX electronic breakers, you can use both boxes together.
We have many customers who use the VPX to provide the Main Bus function and use the Bus Manager to provide the Essential Bus function.
In this case, the Bus Manager and the VPX work as two separate systems operating alongside each other.
The VPX device does not provide a protected Essential Bus. Therefore some other provision (such as the Bus Manager) should be used to protect the 12 volt supply to any flight critical systems.
Robert