KRB-5404
34
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
◯
11
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