Operating The Circuit-Breaker And The Three-Position Disconnector; Switching Operations In The Circuit-Breaker Panel - Siemens 8DA10 Series Installation And Operating Instructions Manual

Operation
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37 Operating the circuit-breaker and the three-position
disconnector
The procedures described in this section apply to:
• Disconnectable voltage transformers or disconnectable busbar connections
• Top-mounted bus sectionalizer
• Switching operations on circuit-breaker panels
• Switching operations on bus sectionalizer panels
37.1

Switching operations in the circuit-breaker panel

Internal arcing and explosion hazard
Operating the three-position disconnector under load can cause injury or property
damage.
A mechanical interlock prevents, as standard, the three-position disconnector from being
operated under load. The switchgear can optionally be equipped in accordance with a
customer-specific interlocking and control scheme.
➭ If the customer-specific interlocking and control scheme requires that the panel be
provided without electromechanical or mechanical interlocks, the three-position
disconnector can be operated under load.
➭ Do NOT operate the three-position disconnector under load.
In circuit-breaker operating mechanisms with undervoltage release, the circuit-breaker
trips automatically after removing the padlock if
➭ no auxiliary voltage is available.
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
CAUTION
INFORMATION