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MDS-C20
Eaton MDS-C20 User Manual
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I.B. 2C12060H08
For more information visit: www.EatonElectrical.com
Instruction Book
Page 56
Effective: May 2006
Figure 4-3 Typical Drawout Cassette Features
Extension Rails
Extension Rail Cutout
Secondary Plug-in Connectors
Secondary Terminal Blocks
2
1
4
3
Arc Hood
Optional Cell (TOC) Switch Mounting
Optional Key Interlock Mounting Location
Grounding Bar
6
5
8
7
1
1
2
2
3
3
4
5
6
7
8
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66
Table of Contents
Table of Contents
4
Section 1: Introduction Page
9
General Information
9
Safety Features
10
Safety Practices
10
Qualified Personnel
11
Other Publications and Documentation
11
Section 2: Receiving, Handling and Installation
12
General Information
12
Suggested Tools
12
Unpacking Circuit Breaker
12
2-3.1 Storing Circuit Breaker
12
Lifting Circuit Breaker
13
Circuit Breaker Inspection
14
Installing Drawout Circuit Breaker
14
2-6.1 Rejection Interlocks
14
2-6.2 Circuit Breaker Positioning
15
2-6.3 Levering Circuit Breaker
17
Fixed Circuit Breaker
18
Circuit Breaker Operation
18
Section 3: Circuit Breaker Description and Operation
19
Introduction
19
3-1.1 MDSL Application/Operation
23
Basic Circuit Breaker Assembly
23
Pole Units
23
3-3.1 Primary Moving Contacts
24
3-3.2 Primary Stationary Contacts
25
Operating Mechanism
25
3-4.1 Manual Operation
25
3-4.2 Electrical Operation
26
3-4.3 Anti-Pump Feature
26
Arc Chambers
26
3-5.1 Arc Chute
26
Electronic Tripping System
28
3-6.1 Microprocessor-Based Trip Unit
28
Rating Plug
29
3-6.3 Current Sensors
29
3-6.4 Trip Actuator
30
3-6.5 Mechanical Trip Flag
30
3-6.6 Making Current Release
30
3-6.7 High Instantaneous Trip Option (Magnum DS Only)
30
3-6.8 Voltage Taps
31
Secondary Contacts and Connection Diagrams
31
3-7.1 Connection Diagrams
32
Accessory Devices
55
3-8.1 Plug-In Electrical Accessories
55
3-8.2 Internal Electrical Accessories
57
3-8.3 Mechanical Accessories
59
MDSL Limiters/Blown Limiter Indication
62
3-9.1 MDSL Current Limiters
62
3-9.2 Blown Limiter Sensing
62
Section 4: Drawout Circuit Breaker and Cassette
64
General
64
4-1.1 Drawout Cassette
64
Drawout Circuit Breaker Dimensions
66
Drawout Cassette Dimensions
66
Section 5: Fixed Circuit Breaker
68
General
68
Fixed Circuit Breaker Dimensions
68
Section 6: Inspection and Maintenance
69
General
69
General Cleaning Recommendations
69
When to Inspect
69
What to Inspect
70
6-4.1 Functional Field Testing
70
6-4.2 Arc Chute Inspection
71
6-4.3 Primary Contact Inspection
72
Circuit Breaker Modifications and Changes
73
6-5.1 Rating Plug Replacement
73
6-5.2 Current Sensor Replacement
74
6-5.3 Current Limiter Replacement (MDSL)
75
6-5.3.1 Replacing Type MA and MB Current Limiters
75
6-5.3.2 Replacing Type MD Current Limiters
75
6-5.3.3 Replacing Type MD Current Limiters on MDSL20 Breakers
75
Section 7: Troubleshooting
77
Introduction
77
Disconnect Position
79
4
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Eaton MDS-C20 Specifications
General
Brand
Eaton
Model
MDS-C20
Category
Power Tool
Language
English
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