Eaton B20B-VR Series Instructions Manual page 38

I.B. 94A1994R01
Page 36 Effective: April 2005
SYMPTOM
FAILS TO CLOSE
• No Trip Sound
• Trip Sound
But no Trip
UNDESIRABLY TRIPS
Instructions for VR-Series
Replacement Breakers for
Westinghouse Type B20B/B22B
INSPECTION AREA
• Control Circuit
• Trip Mechanism
• Trip Mechanism
• Vacuum Interrupter
(One or more Welded)
• Control Circuit
• Mechanism
For more information visit: www.EatonElectrical.com
PROBABLE DEFECTS
• Control Power
(Fuse blown or switch off)
• Secondary Disconnects
• Auxiliary Switch
(a contact not making poor
or burned)
• Trip Coil
(Burned or open)
• Terminals and Connections
(poor or burned or open)
• Trip Clapper
(Jammed)
• Trip Bar, Trip Latch
(Jammed)
• Pole Shaft
(Jammed)
• Operating Rod Assembly
(Broken or pins out)
• Control Power
(CS/T Switch, remains made)
• Trip Coil Clapper
(Not resetting)
• Trip Bar or Trip Latch
(Poor engagement of mating or
worm surfaces)
• Trip Bar Reset Sprint
(Loss of torque)
IB01301018E