Operating the circuit-breaker panel
56 NXAIR / ≤ 40 kA 110-0134.9 / 14
If an undervoltage release is fitted, it must be connected to the auxiliary voltage for
the switching operation, as otherwise closing is not possible.
Unexpected switching noise and vibration
Operating the circuit-breaker discharges and/or charges the spring energy store
abruptly. This causes a short loud noise and low vibration.
Expect switching noise and low vibration from inside the circuit-breaker.
The opening spring is charged during the closing operation.
Preconditions
• Withdrawable circuit-breaker / circuit-breaker truck in service position or in test position
• Circuit-breaker in OPEN position
• Spring state indicator for the closing spring shows CHARGED
• High-voltage door closed
• Panel set to local control
• Padlock (optional) removed from actuating opening
• Push rod available
Fig. 77: High-voltage door with
actuating opening
Turn cover of actuating opening aside using the rotary button located over it.
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