Three-Position Disconnector - Siemens 8DA10 Series Installation And Operating Instructions Manual

Description
Function
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Three-position disconnector

The three-position disconnector combines the functions of a disconnector and an earthing
switch. The three-position disconnector is designed for no-load operation only.
Fig. 6: Three-position disconnector with
busbar and bushing
Switch positions
OPEN
CLOSED
READY-TO-EARTH
EARTHED
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
Position indicator Basic scheme
- Three-position disconnector OPEN
- Circuit-breaker OPEN
- Three-position disconnector CLOSED
- Circuit-breaker CLOSED
- Three-position disconnector READY-TO-EARTH
- Circuit-breaker OPEN
- Three-position disconnector EARTHED
- Circuit-breaker CLOSED
① Fixed contact, busbar
②
Busbar housing
③ Busbar
④ Busbar support
⑤ Fixed contact, earth
⑥
Bushing
⑦ Moving contact in
READY-TO-EARTH/EARTHED position
⑧ Moving contact in CLOSED position
⑨ Moving contact in OPEN position