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
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