Eaton Magnum PXR User Manual

2
User Manual MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON www.eaton.com
List of tables
Description Page
Contents
Description Page
Purpose .................................................... 5
Safety ..................................................... 5
Section 1: Introduction ........................................ 5
General information ......................................... 5
Safety features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Safety practices ............................................ 6
Qualified personnel ......................................... 8
Other publications and documentation .......................... 8
Section 2: Receiving, handling, and installation ..................... 8
General information ......................................... 8
Suggested tools ............................................ 8
Unpacking the circuit breaker ................................. 8
Lifting circuit breaker ........................................ 9
Circuit breaker inspection ....................................10
Installing the drawout circuit breaker ...........................11
Levering circuit breaker ......................................14
Fixed circuit breaker ........................................14
Circuit breaker operation .....................................15
Section 3: Circuit breaker description and operation .................15
Introduction ...............................................15
Basic circuit breaker assembly ................................19
Pole units .................................................19
Operating mechanism ...................................... 21
Arc chambers ............................................. 22
Electronic tripping system ................................... 23
Accessory devices ......................................... 26
Section 4: Master connection diagrams .......................... 32
Secondary contacts and connection diagrams ................... 32
Section 5: Drawout circuit breaker and cassette .................... 40
General ................................................. 40
Drawout circuit breaker dimensions ........................... 42
Drawout cassette dimensions ................................ 42
Section 6: Fixed circuit breaker ................................. 43
General ................................................. 43
Fixed circuit breaker dimensions .............................. 43
Section 7: Importance of maintenance ........................... 43
General ................................................. 43
Safety precautions ......................................... 43
General cleaning recommendations ........................... 44
Functional tests ........................................... 44
Procedure ............................................... 45
Maintenance schedule ...................................... 46
Inspection procedures ...................................... 47
Troubleshooting ........................................... 54
Section 8: Renewal parts ..................................... 58
General ................................................. 58
Disclaimer of warranties and limitation of liability ................... 58
Table 1. Magnum PXR ratings at 240, 480, 600 V ................... 7
Table 2. Power Defense SB ratings at 240, 480, and 600V ............ 7
Table 3. Basic circuit breaker weights (lifting and support reference only) 10
Table 4. Magnum PXR and PD-SB trip units. . . . . . . . . . . . . . . . . . . . . . . 24
Table 5. Shunt trip ratings ..................................... 26
Table 6. Continuous duty shunt trip ............................. 26
Table 7. Spring release ratings ................................. 26
Table 8. Undervoltage release ................................. 27
Table 9. Auxiliary switch, overcurrent trip switch,
and cell switch contact ratings ................................. 27
Table 10. Compact motor operator .............................. 28
Table 11. Normal operating conditions ........................... 46
Table 12. Normal maintenance frequency ........................ 46
Table 13. Increased frequency conditions ........................ 46
Table 14. Altitude rating factors ................................ 46
Table 15. Pre-inspection conditions ............................. 47
Table 16. Pre-inspection conditions ............................. 48
Table 17. Pre-inspection conditions .............................. 49
Table 18. Magnum and PD-SB breaker torque list .................. 49
Table 19. Greases used on Magnum and PD-SB ................... 49
Table 20. Pre-inspection conditions ............................. 51
Table 21. Pre-inspection conditions .............................. 51
Table 22. Pre-inspection conditions ............................. 52
Table 23. Spring charging ..................................... 54
Table 24. Contact closing ..................................... 54
Table 25. Contact opening .................................... 55
Table 26. Levering-in/-out (drawout applications only) ............... 55

Eaton Magnum PXR Specifications

General

Brand	Eaton
Model	Magnum PXR
Category	Circuit breakers
Language	English