GE AKR-30 Series Maintenance Manual page 118

SECTION 8-Contact Maintenance (Cont.)
8 . 5 STATI ONARY CONTACT
I DE NTIFIC AT I O N
T h e stationary arc i n g , i ntermediate, a n d m a i n
contacts each have a d i fferent function d u r i n g cu rrent
con d u ction and c u rrent i nterruption . For this reason,
these contacts are made using d ifferent m aterial
com positions . Also, the different functions req u i re
that the contacts be replaced in configu rations shown
in Figs. 44, 47 and 48.
F i g . 4 9 shows the stationary contacts and how they
d i ffer from one another. The AKR 30 and 30H main
and arc ing contacts are rectan gu lar, but the arc i n g
contacts have two o f t h e i r corners notched . T h e A K R
3 0 L , AKR 50, AKR 5 0 H , A KRT 50 a n d A K R T 50H main
and i nterm ediate contacts are rectang u lar, but the
main contacts have two of their corners notched . The
i ntermed iate contacts have all fou r corners n otched .
AKR 30L AND
1 600/2000 AMP
MAIN
AKR 30L AND
1 600/2000A M P
I NTE R M E D IATE
FIG. 49 - STATIONARY CONTA CT CONFIGU RATION
3 8
800 A M P MAI N
EXCEPT AKR 30L
800 A M P ARCING
EXCEPT AKR 30L