GE AKR-30 Series Maintenance Manual page 209

SECTION 7-Breaker Maintenance (Cont.}
BUFFER ASSE M B LY
7. 1 4
When the breaker is closed, the energy in the closing
spring i s transferred to the main shaft thro u g h the
mechanism. The main shaft then drives the contacts
closed. The end plate assembly on each end of the main
shaft is driven agai nst the buffer assembly shown in Fig.
40. This prevents the mechanism from overdriving the
contacts.
FIG.
40 -
FIG.
41
BU FFER/END P LATE R E LATIONSHI P-BR EAKE R CLOSED
- BUFFER/END P LATE R E LATIONSHIP-B REAKER OPEN
When the breaker is opened, the end plate assembly is
"
driven against the opposite end of the buffer assembly.
The buffer is a stop absorbing the opening energy of the
mechanism. See Fig. 41 .
E N D PLATE
31