802-9081.9 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • Revision 11 189/293
Operation
19.4 Ready-for-service indicator
19.5 Circuit-breaker locking device for "feeder earthed"
The circuit-breaker locking device for "feeder earthed" is operated to lock a circuit-breaker
panel with earthed feeder and secure it against de-earthing.
The operated locking device can be padlocked.
As standard, the locking device can only be operated when the three-position disconnector is
in READY-TO-EARTH position and the circuit-breaker is in CLOSED position. Operating the
locking device in other switch positions is locked as standard.
Preconditions • Three-position disconnector in "READY-TO-EARTH" position
• Circuit-breaker in CLOSED position
• Shackle diameter of the padlock: Min. 6 mm.
Actuating the locking
device
➭ Push the lever of the locking device upwards.
Fig. 155: Circuit-breaker locking device
➭ Fit and lock the padlock.
CAUTION
Internal arcing hazard and explosion hazard
Switching without service readiness can cause serious injury or property damage.
➭ Check service readiness of the switchgear before performing any switching operation. The
pointer of the ready-for-service indicator must be in the green area.
➭ If the pointer of the ready-for-service indicator is in the red area:
- All panel types except circuit-breaker panels: Do not operate the switchgear.
- Contact the Siemens Service Hotline.
Fig. 154: Ready-for-service indicator
①
Switchgear ready for service (green area)
②
Switchgear not ready for service (red area)
③
Pointer
NOTICE
Maloperation of the locking device
Can cause considerable property damage.
For a panel optionally equipped without interlocking between locking device and three-
position disconnector: If the circuit-breaker and the three-position disconnector are in
CLOSED position, do not operate the locking device.
If the locking device is operated, all electrical and mechanical opening commands (e.g.
protection tripping) are ineffective.
➭ Operate the locking device only under the following conditions:
- Three-position disconnector switched to READY-TO-EARTH position.
- Circuit-breaker switched to CLOSED position.
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