Gewiss RESTART/AUTOTEST Manual page 21

The restart function consists of automatically reclosing the differential
switch if it uncouples unexpectedly due to a temporary electrical
phenomenon (lightning, disturbances, etc.).
Before reclosing, the device makes a check that there is no earthing fault in
the circuit downstream: if there is a fault it goes into locked status,
otherwise it proceeds with reclosing.
After a third cut-in of the differential switch within three minutes of a
previous automatic reset, the device goes into locked status.
To re-enable the restart function, open the hatch, raise the differential
switch lever to position "I" and close the hatch.
If the differential switch will not remain in position "I", stop trying and
call a specialised technician to check the system.
The restart function cannot be activated when the differential switch is
open; to activate it the differential switch lever must be raised to
position "I" and the hatch closed. The test key and the differential
switch lever cannot be accessed when the functions are active.
THE RESTART FUNCTION
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