54
User Manual
MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON
www.eaton.com
Troubleshooting
Table 23. Spring charging
Problem
Possible root cause
Actions
Breaker won’t charge mechanically
Charge handle broken
Install replacement handle kit
Manual charge handle unable to be pulled
Verify breaker is not charged. Higher current breakers require more
force to charge. Apply more force to charging handle but do not
exceed 120 lb. If problem persists, a possible mechanism issue may
be present, contact Eaton Electrical Services & Systems
Manual charging handle not engaging
Check to see if breaker is already charged
Possible worn parts will not allow manual charge to engage
Install replacement handle kit
Manual charge handle engages, but cannot reach full charge
Apply force to manual charging not to exceed 120 lb
Manual arm not consistently engaging
Install replacement handle kit
Charging mechanism jamming
Contact Eaton Electrical Services & Systems
Breaker won’t charge electrically
Motor operator skips during charging cycle due to
gear teeth being out of alignment
Contact Eaton Electrical Services & Systems
Improper motor operator mounting
Tighten motor mounting hardware
Incorrect motor mounting
Verify proper orientation of motor operator standoffs to mechanism,
verify motor operator mounting
Insufficient voltage/current to load or leads
Verify supply to motor
Levering device door switch out of adjustment
Adjust switch to pick mating surface on lev in door
Secondary breaker contacts not engaged
Adjust switch lever and check secondary contact terminal condition.
Ensure that breaker is fully in test or connect position.
Loose terminal screws on cutoff switches
Tighten all terminal screws
Motor continuously runs
Contact Eaton Electrical Services & Systems
Table 24. Contact closing
Problem
Possible root cause
Actions
Breaker will not close
Breaker is already closed with flag indication error
Contact Eaton Electrical Services & Systems
An external interlock such as a key or cable
Clear all external interlocks
Closing spring not charged.
Charge the closing spring using the handle or motor operator.
Insufficient voltage/current to spring release.
Verify supply to spring release.
Pushbutton cover and/or prevent close cover blocking access to
CLOSE pushbutton.
Remove cover.
Lev in door is open (drawout breakers only)
Ensure breaker is fully in connect, test, or disconnect position and lev
in door fully closes.
Continuous shunt trip energized
De-energize continuous duty shunt trip
Undervoltage release (UVR) de-energized
Energize UVR
Mechanical obstructions
Remove arc chutes and remove obstructions
Broken trip actuator (TA) resetter or reset spring
Contact Eaton Electrical Services & Systems
Accessory connections not correct
Verify and correct accessory connections
Trip indicator (also known as overcurrent trip switch) not reset
Reset trip indicator
Other unidentified issues
Contact Eaton Electrical Services & Systems
Breaker will not stay closed
(opens immediately)
Lev in door slightly opened and acting upon interlock
Ensure lev in door is complete closed
Voltage present at the shunt trip terminals
Verify and remove remote open signal
Off pushbutton not full returned
Clear obstruction
Loose key interlock linkage assembly or interference
with key interlock cable
Tighten mounting hardware or clear cable obstruction
Breaker attempts to close on overload or fault currents
Investigate and clear cause of fault
Neutral sensor polarity incorrect (ground fault)
Reverse polarity
Shunt trip coil is burned causing armature to remain extended
Replace shunt trip
Other unidentified issues
Contact Eaton Electrical Services & Systems
