Eaton MDS-C30 - User Manual

Double-wide Fixed
Standard Frame Fixed
Narrow Frame Fixed
Instructions for Installation, Operation and Maintenance of
Magnum DS, DSX and DSL Low Voltage Power Circuit Breakers
I.B. 2C12060H08 Supersedes I.B. 2C12060H07 dated April 2005
Effective May 2006
IB2C12060H08
For more information visit: www.EatonElectrical.com
www . ElectricalPartManuals . com

Summary

SAFETY

SECTION 1: INTRODUCTION

1-2 SAFETY FEATURES

Highlights built-in interlocks and safety features designed for personnel protection.

1-3 SAFETY PRACTICES

Outlines essential safety practices to follow during installation, operation, and maintenance.

1-4 QUALIFIED PERSONNEL

Defines the qualifications required for personnel involved in operating or maintaining the equipment.

SECTION 2: RECEIVING, HANDLING AND INSTALLATION

2-5 CIRCUIT BREAKER INSPECTION

Describes the visual inspection process for circuit breakers after unpacking.

2-6 INSTALLING DRAWOUT CIRCUIT BREAKER

Details the process of installing drawout circuit breakers into their cassettes.

2-6.1 REJECTION INTERLOCKS

2-6.2 CIRCUIT BREAKER POSITIONING

2-6.3 LEVERING CIRCUIT BREAKER

Provides instructions on how to lever circuit breakers into and out of their compartments.

2-7 FIXED CIRCUIT BREAKER

2-8 CIRCUIT BREAKER OPERATION

Instructs on initial operation checks for circuit breakers before they are put into service.

SECTION 3: CIRCUIT BREAKER DESCRIPTION AND OPERATION

3-4 OPERATING MECHANISM

Describes the cam and spring design of the breaker's operating mechanism.

3-4.1 MANUAL OPERATION

3-4.2 ELECTRICAL OPERATION

3-4.3 ANTI-PUMP FEATURE

3-6 ELECTRONIC TRIPPING SYSTEM

Describes the three-part electronic tripping system used in Magnum circuit breakers.

3-6.1 MICROPROCESSOR-BASED TRIP UNIT

Introduces the Digitrip RMS trip units used in Magnum circuit breakers.

3-6.2 RATING PLUG

Explains the function and importance of the rating plug in the trip unit.

3-6.3 CURRENT SENSORS

Describes the current sensors installed in the circuit breaker for the tripping system.

3-6.4 TRIP ACTUATOR

3-6.6 MAKING CURRENT RELEASE

3-6.7 HIGH INSTANTANEOUS TRIP OPTION (MAGNUM DS ONLY)

Explains the high instantaneous trip option for Magnum DS breakers.

3-7 SECONDARY CONTACTS AND CONNECTION DIAGRAMS

3-7.1 CONNECTION DIAGRAMS

3-9 MDSL LIMITERS;BLOWN LIMITER INDICATION

Details MDSL current limiters, their application, and blown limiter indication.

3-9.1 MDSL CURRENT LIMITERS

3-9.2 BLOWN LIMITER SENSING

SECTION 4: DRAWOUT CIRCUIT BREAKER AND CASSETTE

4-1.1 DRAWOUT CASSETTE

SECTION 5: FIXED CIRCUIT BREAKER

SECTION 6: INSPECTION AND MAINTENANCE

6-2 GENERAL CLEANING RECOMMENDATIONS

6-3 WHEN TO INSPECT

6-4 WHAT TO INSPECT

Details specific items and areas to inspect on Magnum circuit breakers.

6-4.1 FUNCTIONAL FIELD TESTING

Describes functional tests to perform on circuit breakers during maintenance.

6-4.2 ARC CHUTE INSPECTION

Explains how to inspect arc chutes and chambers for wear or damage.

6-4.3 PRIMARY CONTACT INSPECTION

Details the procedure for inspecting primary contacts for wear using wear indicators.

6-5 CIRCUIT BREAKER MODIFICATIONS AND CHANGES

6-5.1 RATING PLUG REPLACEMENT

6-5.2 CURRENT SENSOR REPLACEMENT

6-5.3 CURRENT LIMITER REPLACEMENT (MDSL)

6-5.3.1 REPLACING TYPE MA AND MB CURRENT LIMITERS

6-5.3.2 REPLACING TYPE MD CURRENT LIMITERS

6-5.3.3 REPLACING TYPE MD CURRENT LIMITERS ON MDSL20 BREAKERS

SECTION 7: TROUBLESHOOTING

Eaton MDS-C30 Specifications