Eaton MDS-408 User Manual

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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

Table of Contents

Questions and Answers:

A
Alyssa JonesAug 8, 2025
What to do if the Eaton MDS-408 Power Tool circuit breaker trips open?
- M
  michaelgilesAug 8, 2025
  If the Eaton Power Tool circuit breaker trips open, it could be due to several reasons. First, ensure the rating plug is installed and corresponds to the current sensors. If the breaker trips repeatedly due to transient current, allow the breaker and loads to cool before re-closing. Finally, an overload or fault current condition may be present. Use the status and fault indicators to locate and remove the overload or fault.
J
Jessica HardinAug 21, 2025
Why does my Eaton MDS-408 circuit breaker open if the fault trip indicator button is not out?
- M
  Mike VaughnAug 21, 2025
  If your Eaton Power Tool circuit breaker opens and the fault trip indicator button is not out, several factors could be at play. It might be due to undervoltage release operation; in this case, check and correct the UVR supply voltage to be within 85-110% of the rated voltage. Alternatively, the shunt trip may be operating, so check the control signals to the shunt trip and correct if necessary. If neither of these is the cause, the trip latch may be defective, so inspect its condition and engagement before closing.

Eaton MDS-408 Specifications

General

Brand	Eaton
Model	MDS-408
Category	Power Tool
Language	English

Summary

Safety Information

Warning for Personnel and Equipment Safety

Highlights the importance of personnel safety and equipment protection from damage.

Safety Features

Safety Practices

Qualified Personnel

Section 2: Receiving, Handling and Installation

Installing Drawout Circuit Breaker

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

Rejection Interlocks Functionality

Describes rejection interlock key plates that prevent incompatible breaker insertion.

Circuit Breaker Positioning Guide

Outlines the four normal positions: Remove, Disconnect, Test, and Connect.

Levering Circuit Breaker Operation

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

Circuit Breaker Inspection

Rejection Interlocks

Describes rejection interlock key plates that prevent incompatible breaker insertion.

Installing Drawout Circuit Breaker

Section 3: Circuit Breaker Description and Operation

Electronic Tripping System Overview

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

Microprocessor-Based Trip Unit Details

Covers Digitrip RMS trip units, their features, and field compatibility.

Rating Plug Functionality

Explains the rating plug's function in identifying sensor ratings and setting instantaneous trip.

Current Sensors Description

Describes the toroidally wound current sensors installed at the rear of the breaker.

High Instantaneous Trip Option (Magnum DS)

Covers the option for 800-3200A breakers to handle 100kA faults while maintaining selectivity.

Accessory Devices Overview

Shunt Trip Functionality

Explains the shunt trip's function to open the breaker when its coil is energized.

Spring Release Operation

Describes the optional device that remotely closes the breaker when its coil is energized.

Undervoltage Release Function

Explains the device that opens the breaker when its supply voltage falls to a certain level.

Overcurrent Trip Switch (Bell Alarm)

Describes the optional trip switch providing electrical indication upon overcurrent trip.

3-9 MDSL Limiters and Blown Limiter Indication

MDSL Current Limiters

Explains MDSL current limiters, their testing, approval, and installation.

Blown Limiter Sensing Mechanism

Describes the visual indicator for blown current limiters and the tripping mechanism.

Section 6: Inspection and Maintenance

What to Inspect on Circuit Breakers

Functional Field Testing Procedures

Outlines functional tests for breaker operation, including manual and electrical tests.

Rating Plug Replacement Procedure

Provides instructions on how to remove and replace the rating plug on the trip unit.

Current Sensor Replacement Procedure

Details the process for removing and installing current sensors and related components.

MDSL Current Limiter Replacement

Explains how to replace MDSL current limiters, emphasizing correct sizing and installation.

Section 7: Troubleshooting

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