Westinghouse F-11 Instructions Manual page 18

The sequence interlock shown in Fig. 21, com­
pels the complete closing and complete opening of
the handle to which the starting breaker is attached
before the running breaker handle can be moved
. to the closed position. With both handles in the
open position the running handle is locked in that
position by the shoulder on the interlocking casting.
When the starting handle reaches the closed posi­
tion the pin in the handle pushes the upper arm of
the unlocking lever upward so the lower locking
portion releases the interlocking lever which then
swings towards the panel. As the starting lever re­
turns to the open position, the pin strikes the unlock-
18
ing surface of the interlocking lever swinging it
back away from the panel. This unlocks the running
handle which can be moved to the closed position
if done promptly before the interlocking lever
swings back into the locking position. If the running
handle is moved to the closed position the interlock­
ing lever is held out away from the panel thus
locking the starting handle in the open position.
The hardware furnished is sufficient to mount
any of the standard breaker assemblies. The table,
Fig. 22, gives the exact hardware for any particular
assembly. The balance left over should be discarded.