Eaton W-VACi User Manual page 44

Symptom
Undesirable Close
Breaker does not trip
Undesirable Trip
44
Inspection area
Undesirable Close
Control Circuit
Mechanism
Shunt trip release circuit
Mechanism
Vacuum Interrupter
Undesirable Trip
Control Circuit
Mechanism
65A7355H01 November 2011 www.eaton.com
Probable cause
● Shunt closing release circuit is energized
● Auxiliary switch does not switch properly
● Close release latch(does not reset)
● Close button does not reset in time
Fail to Trip
● No control power, or its voltage is out of range
（fuse blown or switch off, or wrong voltage applied)
● Secondary disconnect is not connected
● Entire mechanism non functional
● One or more welded
● Shunt trip circuit is energized
● Auxiliary switch does not switch properly
● Trip latch is damaged
● Trip latch does not reset
● Manual trip push button "O" does not reset