Eaton MDS-630 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

Eaton MDS-630 Specifications

General

Brand	Eaton
Model	MDS-630
Category	Power Tool
Language	English

Summary

Section 1: Introduction

1-2 Safety Features

Built-in interlocks and safety features to reduce hazards and ensure proper sequences.

1-3 Safety Practices

Essential practices for personnel safety during installation, operation, and maintenance.

1-4 Qualified Personnel

Requirements and knowledge for personnel operating, maintaining, and installing breakers.

Section 2: Receiving, Handling and Installation

2-6 Installing Drawout Circuit Breaker

Steps for installing drawout circuit breakers into their cassettes, including rail seating.

2-6.1 Rejection Interlocks

Explanation of rejection interlocks to prevent insertion of incompatible circuit breakers into cassettes.

2-6.3 Levering Circuit Breaker

Procedure for levering a drawout circuit breaker into its compartment positions.

2-7 Fixed Circuit Breaker

Features and differences of fixed circuit breakers compared to drawout types.

Section 3: Circuit Breaker Description and Operation

3-6 Electronic Tripping System

Overview of the three-part electronic tripping system: trip unit, sensors, and trip actuator.

3-6.1 Microprocessor-Based Trip Unit

Overview of Digitrip RMS trip units, their features, and compatibility with Magnum breakers.

3-6.2 Rating Plug

Function and importance of the rating plug in setting the trip unit and matching current sensors.

3-6.3 Current Sensors

Description of toroidally wound current sensors installed at the breaker's rear terminals.

3-6.7 High Instantaneous Trip Option (Magnum DS Only)

Option for 800-3200A DS breakers to handle 100kA faults while maintaining selectivity up to 85kA.

3-9 MDSL Limiters/Blown Limiter Indication

Information on MDSL current limiters, their application, testing, and blown limiter indication.

3-9.1 MDSL Current Limiters

Information on MDSL current limiters, their application, testing, and physical characteristics.

3-9.2 Blown Limiter Sensing

Description of the blown limiter indicator and its role in tripping the circuit breaker.

Section 4: Drawout Circuit Breaker and Cassette

4-1.1 Drawout Cassette

Details on drawout cassettes, their interfaces, and types for different breaker frame sizes.

Section 6: Inspection and Maintenance

6-4.1 Functional Field Testing

Procedures for performing manual and electrical functional tests on circuit breakers.

6-5.3 Current Limiter Replacement (MDSL)

Instructions for replacing MDSL current limiters, including specific procedures for MA, MB, and MD types.

6-5.3.1 Replacing Type MA and MB Current Limiters

Step-by-step instructions for replacing MA and MB type current limiters on MDSL breakers.

6-5.3.2 Replacing Type MD Current Limiters

Instructions for replacing MD type current limiters, including hardware and heat sink installation.

6-5.3.3 Replacing Type MD Current Limiters on MDSL20 Breakers

Specific instructions for replacing MD current limiters on MDSL20 breakers, including heat sinks.

Section 7: Troubleshooting