What does the window next to the handle of the TeSys U indicate?

Issue:
What do the 1 and 0 indicate in the window of the LUB power base?

Product Line:
TeSys U Starters - GIC Product

Environment:
US Product

Cause:
Product characteristics

Resolution:
This window indicates the state of the device, running, or tripped, and what kind of trip.
1 indicates that the device is running, 0 is not running.
I>> indicates a magnetic fault.
See the attached instruction bulletin (step H) for illustration.

Released for: Schneider Electric Canada