Circuit-Breaker; Design; Circuit-Breaker Operating Mechanism - Siemens 8DA10 Series Installation And Operating Instructions Manual

Description
Vacuum interrupters

Design

Fig. 5: Circuit-breaker operating mechanism without front cover
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7

Circuit-breaker

7.1 Design
The vacuum circuit-breaker consists of the following components:
• Operating mechanism with stored-energy spring mechanism and control elements (3AH49)
• Operating linkage for contact operation
• 3 switchpanel poles with vacuum interrupters
Fig. 4: Sectional view of
a vacuum interrupter
7.2

Circuit-breaker operating mechanism

The circuit-breaker operating mechanism is closed by a front cover. The front cover contains
openings for control elements and indicators. All components required for operating the
circuit-breaker are accommodated in the operating mechanism housing.
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
①
Moving contact
② Metal bellows
③
Fixed contact
① Auxiliary switch (-S1)
② ON pushbutton
③ Closing solenoid (-Y9)
④
1st shunt release (-Y1)
⑤ Undervoltage release (-Y7)
⑥
OFF pushbutton
⑦ Opening spring
⑧
Operating shaft for circuit-breaker
⑨ Operations counter
⑩ Position indicator for circuit-breaker
⑪ "Spring charged" indicator
⑫ Position switch
⑬
Closing spring
⑭ Actuating opening for "spring charging"
(circuit-breaker)
⑮ Rating plate