Westinghouse DBN-1016 Technical Manual page 28

CIRCUIT BREAKER
The rails are pivoted on the rail pivot pin and
may be lowered by loosening the thumbscrew
and pulling the lever handle
down.
As the
leverillg handle is pulled
down,
the cam section
of the extension rails acts on the roller of the
circuit breaker to disengage the main and sec-
ondary disconnect contacts.
The rails permit racking out of the mov-
able component to a position where it is pos-
1·22
sible to inspect the main and secondary dis-
connects within the switchboard without remov-
ing the movable component.
If
the operator releases a movable compo-
nent that is being drawn out, the free roll of
the movable component will be limited to about
one inch by the extension rail release. After
extension rail release has latched, it must be
depressed before further motion is possible.
(