Page 46 I.B. 3A74792H08
Effective 09/2014
6-12 TROUBLESHOOTING CHART
SYMPTOM INSPECTION AREA PROBABLE DEFECTS
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)
• Trip Sound
But No Trip
• Trip Mechanism
• Trip Bar, Trip Latch
(Jammed)
• Pole Shaft
(Jammed)
• Operating Rod Assembly
(Broken or pins out)
• Vacuum Interrupter
(One or more welded)
Undesirably Trips
• Control Circuit
• Control Power
(CS/T Switch, remains made)
• Mechanism
• Trip Coil Clapper
(Not resetting)
• Trip Bar or Trip Latch
(Poor engagement of mating
or worn surfaces)
• Trip Bar Reset Spring
(Loss of torque)
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