Siemens 8DB10 Installation And Operating Instructions Manual page 26

Description
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Operating mechanism for three-position disconnector
The three-position disconnector is operated from the switchgear front.
• Auxiliary switch
- Each operating mechanism is equipped with an auxiliary switch for the position indication.
• Motor operating mechanism
- Remote operation (standard) applied to terminal
- Local operation (option)
- Manual operation possible by operating lever
• Wiring
- Auxiliary switches and motor operating mechanisms are wired to terminal strips in
the low-voltage compartment.
Interlocks for the three-position disconnector (option)
• The three-position switch is equipped with a mechanical interlock. This interlock prevents
the circuit-breaker from being closed while the three-position switch is being operated.
Furthermore the mechanical interlock prevents the possibility of operating the three-
position switch while the circuit-breaker is closed.
• With single-busbar systems, the control gate can only be operated if the interrogation lever
is pushed downwards. Thus, the corresponding operating shafts are only released at
the operating front after actuation of the interrogation lever.
• The control gate of the switching gate of the three-position switch can be padlocked in
three switch positions.
Fig. 8: Disconnecting function is blocked
Fig. 9: Earthing function is blocked
Fig. 10: Disconnecting and earthing functions are blocked (common function)
Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9