GE Industrial Solutions EntelliGuard 800–2000 A Frames, 240–600 Vac Maintenance Manual - Manual (Page 32)

EntelliGuard™ 800–2000 A Power Circuit Breakers
Chapter 6. Contact Maintenance
22
7. To replace only the stationary contact springs, use
the following procedure:
a. Remove the insulating caps over the bolt head
and nut securing the arcing contacts. Remove the
nut, two flat washers, two springs, and bolt.
Remove the arcing contacts.
b. Remove the bolt, flat washer, nut, and lock washer
securing the main contacts to the assembly.
Remove the main contacts and springs.
c. Insert the new main contact springs and the exist-
ing main contacts into position on the contact
assembly. Replace the bolt, nut, and washers to
secure the main contacts.
d. Place one of the new arcing contact springs and a
flat washer onto the bolt removed in b. Place the
arcing contacts in position, slide the bolt through
the holes, and place the other new spring and a
flat washer and nut onto the bolt. Replace the
insulating caps on the bolt head and nut.
8. To replace only the movable contact springs and
insulator link assembly, use the following procedure:
a. Remove the bolt, flat washer, lock washer, nut,
and two bushings securing the insulator link
assembly and movable main contacts to the con-
tact arm and remove the link assembly and main
contacts.
b. Remove the bolt, nut, two small flat washers, two
springs, and two large flat washers from the mov-
able contact arm pivot.
c. Place a small flat washer, replacement spring, and
large flat washer onto the bolt removed in b.; slide
the bolt through the contact arm pivot; and place
a large flat washer, replacement spring, small flat
washer, and nut onto the bolt.
d. Place a flat washer and bushing onto the bolt
removed in a.; slide the bolt through the replace-
ment insulator link assembly, movable main con-
tacts, and contact arm; and place a bushing, flat
washer, and nut on the bolt.
9. Place the contact assembly back into position, with
the four studs through the appropriate holes in the
back frame. Replace the nuts, flat washers, and lock
washers on the studs.
10. For a lower contact assembly replace the pin attach-
ing the insulator link assembly to the breaker main
shaft and secure with the snap ring removed earlier.
11. Adjust the contacts as described in Section 6.5.
12. Replace the arc chutes and interphase barriers
13. Replace the primary disconnect.
Figure 17. Upper (stationary) contact assembly for EGS08, EGF08, and
EGH08 breakers (EGH08 has two additional main contacts).
Figure 18. Lower (movable) contact assembly for EGS08, EGF08, and
EGH08 breakers (EGH08 has two additional main contacts).