Siemens 3AH37, Operating Instructions Manual, Page: 53 / 64

Operation
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2013-07-08
The adapter (50.6) of the hand crank (50.) is designed in such a way that the hand
crank becomes uncoupled when the motor supply voltage returns.
Closing
Provided there is no lock-out due to a mechanical interlock, send the closing
command via the CLOSE pushbutton (53.) or the corresponding command element
until the vacuum circuit-breaker is closed and shows and signals the CLOSED
position.
Change of the position indicator (59.):
After switching on and possibly releasing the CLOSE pushbutton (53.), the closing
spring (62.) is immediately automatically charged by the motor and the symbol for
"Closing spring charged" becomes visible in the spring state indicator (55.).
Change of the spring state indicator (55.):
Opening
The opening spring (64.) is charged during the closing operation.
To open, send the opening command via the OPEN pushbutton (54.) or the
corresponding command element until the vacuum circuit-breaker is open and
shows and signals the OPEN switching position.
Change of the switching position indicator (59.) after electrical opening:
The spring state indicator (55.) does not change.
Discharging the closing spring
To discharge the closing spring,
• the supply voltage must be deactivated
• on the vacuum circuit-breaker, actuate the OPEN, CLOSE and OPEN
pushbuttons manually one after the other.
This ensures that the vacuum circuit-breaker is open and the closing spring is
discharged.

OPEN CLOSED
 
Charged Discharged Charged
Note
If an undervoltage release 3AX1103… is fitted, it must be connected to control
voltage for switching operations (mechanical or electrical), as otherwise closing
is not possible.

CLOSED OPEN