Eaton MDS-808 - 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 AND PRACTICES

Details built-in safety features and outlines essential safety practices for personnel working with the equipment.

1-4 QUALIFIED PERSONNEL

Defines qualifications for personnel operating and maintaining circuit breakers.

SECTION 2: RECEIVING, HANDLING AND INSTALLATION

2-3 UNPACKING AND STORING CIRCUIT BREAKER

Provides instructions for unpacking, inspecting, and storing circuit breakers to maintain their condition.

2-4 LIFTING CIRCUIT BREAKER

Details safe practices and methods for lifting circuit breakers using appropriate equipment.

2-5 CIRCUIT BREAKER INSPECTION

Outlines visual inspection procedures for circuit breakers after unpacking for damage.

2-6 INSTALLING DRAWOUT CIRCUIT BREAKER

Covers the installation process for drawout circuit breakers.

2-6.1 REJECTION INTERLOCKS

Explains rejection interlocks that prevent incompatible breaker/cassette 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

Details the procedure for levering the circuit breaker into its compartment positions.

2-8 CIRCUIT BREAKER OPERATION

Advises on initial manual and electrical operation checks before putting breakers into service.

SECTION 3: CIRCUIT BREAKER DESCRIPTION AND OPERATION

3-4.3 ANTI-PUMP FEATURE

Describes both mechanical and electrical anti-pump features that prevent automatic reclosing on faults.

3-6 ELECTRONIC TRIPPING SYSTEM

Introduces the three-part electronic tripping system: microprocessor-based trip unit, current sensors, and trip actuator.

3-6.1 MICROPROCESSOR-BASED TRIP UNIT

Discusses Digitrip RMS trip units, their features, compatibility, and field testing capabilities.

3-6.2 RATING PLUG

3-6.3 CURRENT SENSORS

3-6.6 MAKING CURRENT RELEASE

3-9 MDSL LIMITERS;BLOWN LIMITER INDICATION

3-9.2 BLOWN LIMITER SENSING

SECTION 5: FIXED CIRCUIT BREAKER

SECTION 6: INSPECTION AND MAINTENANCE

6-1 GENERAL

Emphasizes the importance of inspection and maintenance for equipment life and reliability.

6-2 GENERAL CLEANING RECOMMENDATIONS

6-3 WHEN TO INSPECT

6-4 WHAT TO INSPECT

Details what to inspect on drawout and fixed circuit breakers, including primary disconnects and wear signs.

6-4.1 FUNCTIONAL FIELD TESTING

Outlines functional tests for drawout and fixed breakers, including manual and electrical operation checks.

Trip Unit Overload Functional Test

Explains functional tests for Digitrip 1150 self-test and handheld Magnum Functional Test Kit.

6-4.2 ARC CHUTE INSPECTION

6-4.3 PRIMARY CONTACT INSPECTION

Details visual inspection of primary contacts for wear and damage, using a contact wear indicator.

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

Circuit breaker cannot be opened remotely, but can be opened locally

Circuit breaker cannot be opened locally

Circuit breaker makes no attempt to close with either local (manual) or remote controls; springs do not discharge

Troubleshooting steps for failure to close, checking springs, operator, and voltage.

Circuit breaker cannot be closed remotely (can be closed locally)

Circuit breaker cannot be closed locally (but can be closed remotely)

Circuit breaker does not recharge electrically but will recharge manually

Drawout circuit breaker will not lever-in

Troubleshooting steps for drawout breaker levering issues, checking levering screw position and cassette requirements.

Eaton MDS-808 Specifications