IB131006EN
Page 54
Effective 07/2017
6-11 TROUBLESHOOTING CHART (Continued Next Page)
SYMPTOM INSPECTION AREA PROBABLE DEFECTS
Fails To Close
• Closing Sound
but no close
• Pole Shaft
(Not open fully)
• Trip Latch Reset Spring
(Damaged or Missing)
• Trip Bar-D Shaft
(Fails to remain reset)
• Trip Latch-Hatchet
(Fails to remain reset)
• Trip Floor Tripper
(Fails to remain reset)
• Close Latch
(Binding)
• Close Latch Roller
(Binding)
• Trip Circuit Energized
Undesirably Closes
• Control Circuit
• Close Circuit
(CS/C Getting Shorted)
• Mechanism • Close Release Latch
(Fails to reset)
• Close Floor Tripper
(Fails to reset)
Fails To Trip
• No Trip Sound
• Control Circuit
• Control Power
(Fuse blown or switch off)
• Secondary Disconnect
• Auxiliary Switch
(a contact not making, poor or burned)
• Trip Coil
(Burned or open)
• Terminals and Connections
(Poor or burned or open)
• Trip Mechanism • Trip Clapper
(Jammed)
Courtesy of NationalSwitchgear.com
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