Eaton Magnum SB Series - Default Chapter; Table of Contents

2
Instructions for Installation, Operation and
Maintenance of Magnum SB Insulated Case
Low Voltage Power Circuit Breakers
EATON CORPORATION www.eaton.com
Instructional Leaet IB2C12063H03
Effective March 2012
Contents Page
Section 1: Introduction
General Information ............................... 5
Safety Features ..................................6
Safety Practices ..................................7
Qualified Personnel ...............................8
Other Publications and Documentation ...............8
Section 2: Receiving, Handling And Installation
General Information ............................... 8
Suggested Tools .................................8
Unpacking Circuit Breaker ..........................9
Storing Circuit Breaker ............................9
Lifting Circuit Breaker ............................ 10
Circuit Breaker Inspection ......................... 11
Installing Drawout Circuit Breaker ................... 11
Rejection Interlocks .............................. 11
Circuit Breaker Positioning ........................14
Levering Circuit Breaker ..........................14
Fixed Circuit Breaker .............................15
Circuit Breaker Operation .........................15
Section 3: Circuit Breaker Description And Operation
Introduction ....................................16
Basic Circuit Breaker Assembly .....................20
Pole Units .....................................20
Primary Moving Contacts .........................20
Primary Stationary Contacts .......................21
Operating Mechanism ............................22
Manual Operation ...............................22
Electrical Operation ..............................23
Anti-Pump Feature ...............................23
Arc Chambers ..................................23
Arc Chute .....................................23
Electronic Tripping System .........................24
Microprocessor-based Trip Unit .....................24
Rating Plug ....................................26
Current Sensors ................................26
Trip Actuator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Mechanical Trip Flag ..............................27
Making Current Release ..........................27
Fixed Instantaneous Non-Adjustable Setting ............27
High Instantaneous Trip ...........................27
Voltage Taps .................................... 28
Secondary Contacts and Connection Diagrams ........28
Contents Page
Connection Diagrams ............................29
Accessory Devices ..............................48
Plug-In Electrical Accessories ......................48
Internal Electrical Accessories ...................... 50
Mechanical Accessories ..........................52
Section 4: Drawout Circuit Breaker And Cassette
General .......................................55
Drawout Cassette ...............................55
Drawout Circuit Breaker Dimensions ................57
Drawout Cassette Dimensions .....................57
Section 5: Fixed Circuit Breaker
General .......................................58
Fixed Circuit Breaker Dimensions ...................58
Section 6: Inspection And Maintenance
General .......................................59
General Cleaning Recommendations ................59
When to Inspect ................................59
What to Inspect ................................. 60
Functional Field Testing ...........................60
Manual Operation Functional Test ...................61
Electrical Operation Functional Test .................. 61
Trip Unit Overload Functional Test ...................61
Arc Chute Inspection ............................. 61
Primary Contact Inspection ........................62
Breaker Frame Inspection ........................63
Breaker Mechanism Inspection ....................64
Circuit Breaker Modifications and Changes ...........66
Rating Plug Replacement .........................66
Current Sensor Replacement ......................67
Section 7: Troubleshooting
Introduction ....................................68
Section 8: Renewal Parts
General .......................................69
Figures
Figure 1. Family of Magnum SB Low Voltage Power Fixed and
Drawout Circuit Breakers (800-5000 Amperes) .........6
Figure 2. Typical Magnum SB Nameplate ..............7
Figure 3. Typical Magnum SB Designation Example ......8
Figure 4. Shipping Clamps for Drawout Circuit Breaker ...9
Figure 5. Magnum SB Circuit Breaker with Lifting
Yoke Attached .................................. 10