Siemens NXAIR - Racking the Withdrawable Circuit-Breaker; Circuit-Breaker Truck to Test Position

Operating the circuit-breaker panel
50 NXAIR / ≤ 40 kA 110-0134.9 / 14
10.9 Racking the withdrawable circuit-breaker / circuit-breaker truck to test position
NOTICE
Maloperation
Racking the withdrawable circuit-breaker / circuit-breaker truck to test position is
only permissible if the circuit-breaker is in OPEN position.
Check through the inspection window in the high-voltage door if the
circuit-breaker is in OPEN position.
Switch the circuit-breaker to OPEN position, if required.
Position indicators on high-voltage door for circuit-breaker types 3AE1 and 3AE5
Fig. 65: Circuit-breaker type 3AE1:
position indicator OPEN
Fig. 66: Circuit-breaker type 3AE5:
position indicator OPEN
Preconditions
• Withdrawable circuit-breaker / circuit-breaker truck in service position
• Circuit-breaker in OPEN position
• Racking crank for moving the withdrawable circuit-breaker / circuit-breaker truck available
• Double-bit key available
• Padlock (optional) removed from operating slide
• For electromagnetic interlock (optional):
• Electromagnetic interlock deactivated
• For panels with removable voltage transformers (optional):
• Door to voltage transformer compartment closed and screwed tight
The actuating opening for racking the withdrawable circuit-breaker / circuit-breaker truck is located on the
control board of the high-voltage door.
Fig. 67: Actuating opening for racking the
withdrawable circuit-breaker /
circuit-breaker truck
Fig. 68: Racking crank
Fig. 69: Double-bit key,
diameter 5 mm