Contact Gap; Replacement Of Contacts - GE AK-2-50 Maintenance Manual

1. Screw .
2. Stationary Arcing Contact -
3. Pin (Stationary Arcing Contact)
4. Movable Arcing Contact
5. Spring (Leaf Contact) _
5A. Stationary Intermediate Contact
6. Movable Main Contact ·
. 7. Shouldered Pin
1
2
3
4
Low Voltage Power Circuit Breake~s GEK-7303
- 28 ·
~
--------- 27
26
8. Pin (Arcing Contact Links)
5
~---t-..,,._---.....::,aa-...,
•--r--+---+----...--
22
.J.------~l -
9. Insulating Link ·
. 10. Pin (Insulating Link)
lOA. Adjusting Plate
5A-~--t---\----~-
______ 20A
10B. Buffer Spacers
11. Pin (Side Link)
12. Link
13. Clevis
14. Clevis Pin
6
'l
8
9
_ _ _ 20
~~f/r:J__..-------1~
- - - - 1 8
15. Lower Stud
16. Pole Unit Base
10 -----
1 - - - - - 1 6
· 17. Spring (Main Movable Contact)
18. Pin (Main Movable Contact) ·
lOA _ _ _ _ ,
19. Pin (Movable Arcing Contact)
20. Side Link - _
20A. Contact Stop . - · -
21. Spring -(Statio:f1ar.y Main Contact) - -
22 •. Spring (Stationary Arcing Contact)
23. Upper Stud -_ ·
24. Leaf Spring (Stationary Main Contacts)
·
25. Pin (Stationary Main Contact) -
26. Stationary Main Contact
27 • . screw.
28. Stop
=-
.:=.;,,.-i----,
{
-.
I
I
15
. Fig.
6 (0107D7517rPote unit assembly-AK-50 _
a:t least 3/16
1/4 in.
in., the ·main: contacts gap at l~ast - spacers on the cross-bar • . The ~ocking nuts
<?D
- the buffer bolts should.
be locked m such a pos1-
-
-
NOTE: -This check can . best be made
by means of the m~~tenance -h~dle,-~ith - _
the safety pin rel?trammg th_e closing springs.
If
the gap is under the required minimum. it is
-usually possible to form the arcing contacts and
obtain the re_quired dimensions.
' F O
form ~e con-
tacts, place a piece of conchnt approximately
two feet long, over the contact and form the contact
either forward or backward. If the proper dimen-
sions- are still not obtained the movable arc-
ing contacts should be replaced.
If it has been necessary to make -any adjust-
ments while obtaining proper _ contact sequence,
the contact wipe and pressure must be checked, -
and adjusted,
if
necessary.
CONTACT GAP (Fig. 6)
When · the breaker is open, the gap - between
the movable and stationary contacts should be
between 2 5/8 in. and 2 3/4 in. The gap may
be adjusted · by varying the number of buffer
- tion that th~ buffer bolt may be rotated fre~ly.
REPLACEMENT OF CONTACTS
(Fig. 6)
- .
- Stationary A~cing Contads (2, Fig. _6)
(1, Fig. 7) -
1. Remove the upper plate by removing two
screws . (1). On the -AK-75 and -100 r~move ~e
.top contact Qlock (25, Fig. 7) and remove insulation
(3, Fig. 7). __
-
.
2. Loosen screws holding spring.-
(5)
3 • . - Remove pin (3) freeing the stationary con-
. tacts and springs (22). · ·
4. Install new springs and stationary arcing
contacts in reverse order. ·
5. Adjust contact wipe and pressure. (See
ADJUSTING CONTACT WIPE AND PRESSURE).
,,