Eaton MDS-820 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:

T
Tony FowlerAug 6, 2025
What to do if the Eaton Power Tool circuit breaker trips open?
- C
  Courtney SteeleAug 6, 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.
K
Karl AllenAug 22, 2025
Why does my Eaton MDS-820 circuit breaker open if the fault trip indicator button is not out?
- E
  egonzalezAug 22, 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-820 Specifications

General

Brand	Eaton
Model	MDS-820
Category	Power Tool
Language	English

Summary

Purpose and Safety Information

General Safety Requirements

Emphasizes adherence to safety codes, standards, and regulations during installation and operation.

Warning Labels and Presentation

Explains the style of warning labels to ensure personnel are alert to safety precautions.

Inspection, Troubleshooting, and Renewal Parts

Inspection and Maintenance Overview

Introduces inspection and maintenance requirements for Magnum circuit breakers.

Troubleshooting Guide Introduction

Introduces the troubleshooting section and lists resources for assistance.

Introduction to Magnum Circuit Breakers

Safety Features and Practices

Highlights built-in safety features and essential practices for safe operation.

Qualified Personnel and Documentation

Receiving, Handling, and Installation

Lifting Circuit Breakers Safely

Breaker Inspection and Drawout Installation

Outlines visual inspection steps and the process for installing drawout circuit breakers.

Rejection Interlocks and Positioning

Explains the function of rejection interlocks and the four normal positions for drawout breakers.

Levering Circuit Breakers

Describes the procedure for levering circuit breakers into TEST or CONNECT positions.

Fixed Circuit Breakers and Operation

Fixed Circuit Breaker Features

Initial Operation Checks

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

Electronic Tripping System

Overview of Tripping System

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

Rating Plug and Current Sensors

Explains the function and importance of rating plugs and current sensors.

Trip Actuator and Special Options

Details the trip actuator, mechanical trip flag, making current release, and high instantaneous trip.

MDSL Limiters and Blown Limiter Indication

MDSL Current Limiters

Explains the application, selection, and replacement of MDSL integral current limiters.

Fixed Circuit Breakers

Inspection and Maintenance

General Inspection and Cleaning

Inspection Schedule and Field Testing

Arc Chute and Primary Contact Inspection

Troubleshooting

Troubleshooting Guide Introduction

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