ABB ADVAC Installation And Operation Manual page 15

Activating the closing push button rotates the
closing shaft and releases the closing hook
(1). The stored energy of the closing spring is
transferred to the closing lever assembly (2)
which pushes the long levers of the cam/
toggle assembly connected by a pin (3). The
long levers move the main shaft counter-
clockwise (4) which transfers the motion to the
push rods connected to the contacts in the
vacuum interrupters. The breaker signals that
it is closed
10
MECHANISM AND OPERATION
Description of EL Operation
6
9
8
1VAL050503-MB Rev B Replaces (1VAL057485-MB Rev. C) Oct 2013
5
4
3
The long levers reach their settled position (6)
once the breaker is closed and are held by the
central hook of the cam/toggle assembly (8).
The contact springs inside the poles and the
opening spring inside the frame are charged.
The contact springs maintain contact pressure
while the breaker is in the closed position.
The central hook applies force to the opening
hook (9) which is locked by the opening shaft
(10).
1
1
2
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