Name: Eaton MDS-C20
Brand: Eaton
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I.B. 2C12060H08

For more information visit: www.EatonElectrical.com

Instruction Book

Page 13

Effective: May 2006

Baffled Arc Chute Cover

Secondary Contact Connector

Faceplate (Front Cover)

Integral Lifting Handle

Fixed Vertical Primary Terminals

with Optional Vertical Adaptor

Arc Chamber

Mounting Foot

Circuit Breaker Nameplate

Phase Identification Labels

Figure 3-4 Typical Double-wide MDS/MDSX Standard Frame Fixed Circuit Breaker Features (Front and Rear

Views) (MDSX shown without required arc hood)

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Table of Contents4
Section 1: Introduction Page9
General Information9
Safety Features10
Safety Practices10
Qualified Personnel11
Other Publications and Documentation11
Section 2: Receiving, Handling and Installation12
General Information12
Suggested Tools12
Unpacking Circuit Breaker12
- 2-3.1 Storing Circuit Breaker12
Lifting Circuit Breaker13
Circuit Breaker Inspection14
Installing Drawout Circuit Breaker14
- 2-6.1 Rejection Interlocks14
- 2-6.2 Circuit Breaker Positioning15
- 2-6.3 Levering Circuit Breaker17
Fixed Circuit Breaker18
Circuit Breaker Operation18
Section 3: Circuit Breaker Description and Operation19
Introduction19
- 3-1.1 MDSL Application/Operation23
Basic Circuit Breaker Assembly23
Pole Units23
- 3-3.1 Primary Moving Contacts24
- 3-3.2 Primary Stationary Contacts25
Operating Mechanism25
- 3-4.1 Manual Operation25
- 3-4.2 Electrical Operation26
- 3-4.3 Anti-Pump Feature26
Arc Chambers26
- 3-5.1 Arc Chute26
Electronic Tripping System28
- 3-6.1 Microprocessor-Based Trip Unit28
- Rating Plug29
- 3-6.3 Current Sensors29
- 3-6.4 Trip Actuator30
- 3-6.5 Mechanical Trip Flag30
- 3-6.6 Making Current Release30
- 3-6.7 High Instantaneous Trip Option (Magnum DS Only)30
- 3-6.8 Voltage Taps31
Secondary Contacts and Connection Diagrams31
- 3-7.1 Connection Diagrams32
Accessory Devices55
- 3-8.1 Plug-In Electrical Accessories55
- 3-8.2 Internal Electrical Accessories57
- 3-8.3 Mechanical Accessories59
MDSL Limiters/Blown Limiter Indication62
- 3-9.1 MDSL Current Limiters62
- 3-9.2 Blown Limiter Sensing62
Section 4: Drawout Circuit Breaker and Cassette64
General64
- 4-1.1 Drawout Cassette64
Drawout Circuit Breaker Dimensions66
Drawout Cassette Dimensions66
Section 5: Fixed Circuit Breaker68
General68
Fixed Circuit Breaker Dimensions68
Section 6: Inspection and Maintenance69
General69
General Cleaning Recommendations69
When to Inspect69
What to Inspect70
- 6-4.1 Functional Field Testing70
- 6-4.2 Arc Chute Inspection71
- 6-4.3 Primary Contact Inspection72
Circuit Breaker Modifications and Changes73
- 6-5.1 Rating Plug Replacement73
- 6-5.2 Current Sensor Replacement74
- 6-5.3 Current Limiter Replacement (MDSL)75
- 6-5.3.1 Replacing Type MA and MB Current Limiters75
- 6-5.3.2 Replacing Type MD Current Limiters75
- 6-5.3.3 Replacing Type MD Current Limiters on MDSL20 Breakers75
Section 7: Troubleshooting77
Introduction77
Disconnect Position79

Brand	Eaton
Model	MDS-C20
Category	Power Tool
Language	English

Eaton MDS-C20 User Manual

Table of Contents

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Eaton MDS-C20 Specifications

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