Instruction manual

KRB-5377
32
The charging handle or the charging motor provides a
counterclockwise rotation to charging cam ◯
1
. This
rotates closing release lever ◯
2
and closing tripper
lever ◯
3
counterclockwise and a semicircular pawl
engages with closing release lever ◯
2
. And charging
lever ◯
4
rotates clockwise so that closing spring ◯
5
is
compressed and closing cam 5 rotates
counterclockwise. At this time, each component is
positioned as shown in Fig. 24.
Fig. 26 Charging motion
For manual opening operation, OFF button ◯
1
rotates
counterclockwise and trip linkage ◯
2
rotates clockwise.
For electrical opening operation, push rod ◯
1
protrudes
downward from the shunt trip device (SHT) or the
undervoltage trip device (UVT). For tripping operation
by the overcurrent release (OCR), moving core ◯
1
protrudes downward from the magnet hold trigger
(MHT) and trip linkage ◯
2
rotates counterclockwise.
(Parts marked with an asterisk (*) are trip pins. To
avoid superposition in the figure, magnet hold trigger
related parts are drawn in positions that are different
from actual positions. This rotates trip trigger shaft ◯
3
counterclockwise and trip lever B ◯
4
disengages from
a semicircular pawl and rotates counterclockwise. And
trip lever A ◯
5
rotates counterclockwise, trip link ◯
6
moves to a lower right direction and closing toggle
cam ◯
7
rotates clockwise. The force of closing spring
◯
9
and contact spring ◯
10
rotates crossbar ◯
8
counterclockwise, so that moving contact ◯
10
is parted
from stationary contact ◯
12
. At this time, each
component is positioned as shown in Fig. 25.
Fig. 27 Opening motion
◯
1
◯
4
◯
2
◯
3
◯
6
◯
5
◯
1
"
◯
2
"
◯
3
◯
4
◯
5
◯
6
◯
7
◯
8
◯
11
◯
1
'
◯
1
◯
2
*
◯
9
◯
10
◯
10
◯
12
◯
12