Eaton MDS-612 - 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

SECTION 1: INTRODUCTION

1-2 SAFETY FEATURES

Highlights built-in interlocks and safety features for hazard reduction and proper operating sequences.

1-3 SAFETY PRACTICES

Outlines essential safety practices for personnel working with circuit breakers.

1-4 QUALIFIED PERSONNEL

Defines qualifications for personnel operating and maintaining circuit breakers.

SECTION 2: RECEIVING, HANDLING AND INSTALLATION

2-6 INSTALLING DRAWOUT CIRCUIT BREAKER

Steps for installing drawout circuit breakers into cassettes.

2-6.1 REJECTION INTERLOCKS

Explanation of rejection interlocks to prevent incompatible breaker insertion.

2-6.2 CIRCUIT BREAKER POSITIONING

Describes the four normal positions for drawout circuit breakers: Remove, Disconnect, Test, Connect.

2-6.3 LEVERING CIRCUIT BREAKER

Instructions for levering the circuit breaker into its various positions within the compartment.

SECTION 3: CIRCUIT BREAKER DESCRIPTION AND OPERATION

3-4 OPERATING MECHANISM

Overview of the cam and spring-based operating mechanism.

3-4.1 MANUAL OPERATION

Instructions for manually charging, closing, and opening the circuit breaker.

3-4.2 ELECTRICAL OPERATION

Information on operating the breaker using electrical operators and accessories.

3-4.3 ANTI-PUMP FEATURE

Explanation of the mechanical and electrical anti-pump features.

3-6 ELECTRONIC TRIPPING SYSTEM

Overview of the three-part electronic tripping system.

3-6.1 MICROPROCESSOR-BASED TRIP UNIT

Information on Digitrip RMS trip units and their features.

3-6.2 RATING PLUG

Function and importance of the rating plug in relation to sensors.

3-6.3 CURRENT SENSORS

Description of current sensors and their role in the tripping system.

3-6.4 TRIP ACTUATOR

Explanation of the electromagnetic trip actuator.

3-6.6 MAKING CURRENT RELEASE

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

3-8.1 PLUG-IN ELECTRICAL ACCESSORIES

3-8.2 INTERNAL ELECTRICAL ACCESSORIES

3-8.3 MECHANICAL ACCESSORIES

SECTION 6: INSPECTION AND MAINTENANCE

6-1 GENERAL

Importance of inspection and maintenance for circuit breaker life and reliability.

6-2 GENERAL CLEANING RECOMMENDATIONS

6-4 WHAT TO INSPECT

6-4.1 FUNCTIONAL FIELD TESTING

Steps for performing functional tests on drawout and fixed circuit breakers.

6-4.2 ARC CHUTE INSPECTION

6-4.3 PRIMARY CONTACT INSPECTION

6-5.1 RATING PLUG REPLACEMENT

6-5.2 CURRENT SENSOR REPLACEMENT

6-5.3 CURRENT LIMITER REPLACEMENT (MDSL)

SECTION 7: TROUBLESHOOTING

7-1 INTRODUCTION

Guide to identifying and resolving common circuit breaker problems.

Eaton MDS-612 Specifications