Eaton Magnum PXR - Figure 66. Typical Drawout Cassette Features

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User Manual MN013016EN

Effective July 2022

Magnum PXR and Power Defense SB low

voltage power circuit breakers user manual

EATON www.eaton.com

Figure 66. Typical drawout cassette features

Extension rails

Extension rail cutout

Secondary plug-in connector

Secondary terminal blocks

Arc hood

Option cell (TOC) switch mounting location

Optional key interlock mounting location

Grounding bar

Main Page

Table of Contents2
Purpose5
Safety5
Section 1: Introduction5
General Information5
Safety Features6
Safety Practices6
Figure 1. Family of Magnum PXR Low Voltage Power Circuit Breakers (800-6000 A)6
Figure 2. Typical Magnum PXR Nameplate6
Table 1 . Magnum PXR Ratings at 240, 480, 600 V7
Table 2. Power Defense SB Ratings at 240, 480, and 600V7
Qualified Personnel8
Other Publications and Documentation8
Section 2: Receiving, Handling, and Installation8
General Information8
Suggested Tools8
Unpacking the Circuit Breaker8
Figure 3. Typical Magnum PXR and PD-SB Designation Example8
Lifting Circuit Breaker9
Figure 4. Shipping Clamps for Drawout Circuit Breaker9
Figure 5 . Magnum Circuit Breaker with Lifting Yoke Attached (Magnum DS Shown)9
Circuit Breaker Inspection10
Table 3. Basic Circuit Breaker Weights (Lifting and Support Reference Only)10
Installing the Drawout Circuit Breaker11
Figure 6. One Side of Drawout Circuit Breaker Properly Seated on Extension Rail11
Figure 7. Cassette Rejection Interlock Pin Positioning/Installation11
Figure 8. REMOVE Position12
Figure 9. DISCONNECT Position12
Figure 10. TEST Position13
Figure 11. CONNECT Position13
Levering Circuit Breaker14
Fixed Circuit Breaker14
Figure 12. Cassette Label Showing DISCONNECTED, TEST, and CONNECTED Position of Recessed Cover14
Figure 13. Levering Position Indication14
Circuit Breaker Operation15
Section 3: Circuit Breaker Description and Operation15
Introduction15
Figure 14. Typical Fixed Magnum PXR Circuit Breaker15
Figure 15 . Typical PXR Drawout Circuit Breaker Features (Front and Rear Views)16
Figure 16 . Typical PXR Fixed Circuit Breaker Features (Front and Rear Views)16
Figure 17 . Typical Double-Wide Standard Frame Circuit Breaker Features (Front and Rear View)17
Figure 18 . Magnum PXR and PD-SB Drawout Circuit Breaker18
Basic Circuit Breaker Assembly19
Pole Units19
Figure 19 . Typical Magnum and PD-SB Construction (Right Side View)19
Figure 20 . Features of Magnum and PD-SB Moving Conductor Assembly19
Figure 21. Narrow Frame (8-Finger) Moving Conductor Assembly20
Figure 22. Standard Frame (12-Finger) Moving Conductor Assembly20
Figure 23 . General Partial Cross-Sectional View20
Operating Mechanism21
Figure 24 . Typical Electrically Operated Drawout MPS Circuit Breaker with Front Cover Removed21
Figure 25. Circuit Breaker Closing Springs Being Manually Charged (Magnum DS Shown)21
Arc Chambers22
Figure 26. Electrical Motor Operator to Charge Closing Spring22
Figure 27. Cross Section of Conductor and Arc Control System22
Figure 28. Integral Arc Runner Viewed from Top of Arc Chamber (Arc Chute Removed, Circuit Breaker Closed)22
Electronic Tripping System23
Figure 29. Arc Plate Assembly23
Figure 30. Pictorial Diagram of Typical Current Sensing, Processing, and Tripping System23
Table 4. Magnum PXR and PD-SB Trip Units24
Figure 31. PXR 25 Programmable Trip Unit Installed in Magnum PXR Circuit Breaker24
Figure 32. Narrow Frame Current Sensors Shown with Cover Plate Removed25
Figure 33 . Line and Load-Side Voltage Taps for PXR Circuit Breakers25
Accessory Devices26
Table 5. Shunt Trip Ratings26
Table 6. Continuous Duty Shunt Trip26
Table 7. Spring Release Ratings26
Figure 34. Through-The-Window Electrical Accessories26
Figure 35. Shunt Trip with Cutoff Switch26
Figure 36. Shunt Trip Switch Installed26
Table 8. Undervoltage Release27
Table 9 . Auxiliary Switch, Overcurrent Trip Switch27
Figure 37. Spring Release with Optional Latch Switch27
Figure 38. Undervoltage Release27
Figure 39. Shunt Trip, Spring Release, and Undervoltage Release Installed27
Table 10 . Compact Motor Operator28
Figure 40. Auxiliary Switch (Form C)28
Figure 41. Mechanical Trip Indicator with Associated Overcurrent Trip Switch28
Figure 42. Motor Operator Kit28
Figure 43. Motor Operator Installed in a Standard Frame Circuit Breaker29
Figure 44. Cover Mounted Key Lock and Operations Counter29
Figure 45. Cassette-Mounted Key Lock29
Figure 46 . OPEN-CLOSE Pushbutton Lockable Cover Plate (Magnum DS Shown)30
Figure 47. Typical Safety Shutters in CLOSED Position30
Figure 48. Typical Safety Shutters in OPEN Position30
Figure 49. Cell Switch (Drawout Position Indicator) Unmounted30
Figure 50. Cell Switches Mounted on Cassette30
Figure 51. Door Escutcheon and Gasket31
Figure 52. IP55 Waterproof Cover (Magnum DS Shown)31
Figure 53. Cassette-Mounted Two-Way Cable Interlock (Magnum DS Shown)31
Section 4: Master Connection Diagrams32
Secondary Contacts and Connection Diagrams32
Figure 54 . Secondary Connector Protective Hood32
Figure 55. Top View Secondary Connectors32
Figure 56. Typical Cassette-Mounted Secondary Wiring33
Figure 57. AMP Secondary Wiring Removal Tool33
Figure 58 . Magnum PXR and PD-SB 3-Pole Wiring Diagram (PXR20/25)34
Figure 59 . Magnum PXR and PD-SB 4-Pole Wiring Diagram (PXR20/25)35
Figure 60 . Magnum PXR and PD-SB 6-Pole ABCABC Wiring Diagram (PXR20/25)36
Figure 61 . Magnum PXR and PD-SB 8-Pole NABCNABC Wiring Diagram (PXR20/25)37
Figure 62 . PXR and PD-SB 6/8 Pole Wiring Diagram (PXR20/25) for Alternate Phasing Configurations38
Figure 63. Magnum PXR and PD-SB Accessory Wiring Diagrams (PXR 20/25)39
Section 5: Drawout Circuit Breaker and Cassette40
General40
Figure 64. MPS/SPS Drawout Circuit Breaker in Cassette40
Figure 65. MPS/SPS Drawout Circuit Breaker with Automatic Primary Disconnects40
Figure 66. Typical Drawout Cassette Features41
Drawout Circuit Breaker Dimensions42
Drawout Cassette Dimensions42
Figure 67. Typical Narrow Frame Cassette (Horizontal Terminals)42
Figure 68. Typical Basic Cassette (Vertical Terminals)42
Figure 69. Typical Basic Cassette (Without Stabs)42
Figure 70 . Typical Universal Cassette, Four-Pole (Flat Terminal Pads)42
Section 6: Fixed Circuit Breaker43
General43
Fixed Circuit Breaker Dimensions43
Section 7: Importance of Maintenance43
Safety Precautions43
Figure 71. Fixed Narrow Frame Circuit Breaker with Available Vertical Adapter Shown43
General Cleaning Recommendations44
Functional Tests44
Figure 72. CLOSED and OPEN Indicators44
Procedure45
Figure 73. Accessory Viewing Windows45
Figure 74. Power Xpert Protection Manager (PXPM) Software45
Maintenance Schedule46
Table 11. Normal Operating Conditions46
Table 12. Normal Maintenance Frequency46
Table 13. Increased Frequency Conditions46
Table 14. Altitude Rating Factors46
Inspection Procedures47
Table 15. Pre-Inspection Conditions47
Figure 75. Top Rear View of Circuit Breaker with One Arc Chute Removed47
Figure 76. Bottom View of Arc Chute47
Table 16 . Pre-Inspection Conditions48
Figure 77. Primary Contacts with Circuit Breaker Open (Not Used for Contact Wear Inspection)48
Figure 78. Contact Inspection Area with Circuit Breaker Open48
Table 17 . Pre-Inspection Conditions49
Table 18 . Magnum and PD-SB Breaker Torque List49
Table 19 . Greases Used on Magnum and PD-SB49
Figure 79. Use of Contact Wear Indicator with Circuit Breaker Closed49
Figure 80 . Magnum PXR Breaker Mechanism Lubrication50
Figure 81 . Magnum PXR Pole Shaft Lubrication50
Figure 82 . Magnum PXR Drawout System Lubrication (Not Applicable to Fixed-Mount Breakers)50
Figure 83 . Magnum PXR Drawout System Lubrication50
Figure 84 . Magnum PXR Charging Handle and Gear Lubrication50
Figure 85 . Magnum PXR Pole Shaft and TA Spring Lubrication50
Table 20 . Pre-Inspection Conditions51
Table 21 . Pre-Inspection Conditions51
Figure 86. Primary Disconnects51
Figure 87. Breaker Secondary51
Figure 88. Cassette Secondary51
Table 22 . Pre-Inspection Conditions52
Figure 89. Charged and Opened52
Figure 90. Push to Close52
Figure 91. Levering-In Door in Position between Disconnect and Test53
Troubleshooting54
Table 23. Spring Charging54
Table 24. Contact Closing54
Table 25. Contact Opening55
Table 26. Levering-In/-Out (Drawout Applications Only)55
Section 8: Renewal Parts58
General58
Disclaimer of Warranties and Limitation of Liability58

Eaton Magnum PXR - Figure 66. Typical Drawout Cassette Features

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