Eaton MDS-84N 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:

B
Brian LopezAug 7, 2025
What to do if the Eaton MDS-84N circuit breaker trips open?
- M
  Mark WilliamsAug 7, 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.
M
Maria MooreAug 20, 2025
Why does my Eaton MDS-84N Power Tool circuit breaker open if the fault trip indicator button is not out?
- J
  Joshua BennettAug 20, 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-84N Specifications

General

Brand	Eaton
Model	MDS-84N
Category	Power Tool
Language	English

Summary

Introduction to Magnum Circuit Breakers

Safety Features in Magnum Breakers

Details built-in interlocks and safety features for protection and proper operating sequences.

Essential Safety Practices

Lists essential safety practices for personnel during installation, operation, and maintenance.

Qualified Personnel Requirements

Defines qualifications for personnel involved in breaker operation, maintenance, and installation.

Receiving, Handling, and Installation Guide

Circuit Breaker Unpacking Procedures

Safe Lifting Procedures for Circuit Breakers

Circuit Breaker Inspection Guidelines

Installing Drawout Circuit Breakers

Rejection Interlocks for Drawout Breakers

Drawout Circuit Breaker Positioning

Levering Circuit Breakers into Position

Fixed Circuit Breaker Installation

Circuit Breaker Description and Operation Details

MDSL Application and Operation

Operating Mechanism Overview

Manual Circuit Breaker Operation

Details manual spring charging, closing/opening via buttons, and optional covers.

Electrical Circuit Breaker Operation

Describes electrical spring charging and manual closing/opening for electrically operated breakers.

Anti-Pump Feature Functionality

Explains anti-pump features preventing automatic reclosing on faults.

Electronic Tripping System Components

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

Microprocessor-Based Trip Unit Details

Discusses Digitrip RMS trip units, features, compatibility, and upgrade options.

Rating Plug Functionality

Explains rating plug function, matching sensors, and NEC requirements for ground fault pickup.

Current Sensor Description

Describes toroidal sensors, their function, and availability of neutral sensors.

Making Current Release Safety Feature

Secondary Contacts and Wiring

Detailed Connection Diagrams

Refers to figures showing connection diagrams for Magnum breakers using Digitrip RMS trip units.

Drawout Circuit Breaker and Cassette Features

Drawout Cassette Description

Circuit Breaker Inspection and Maintenance

General Cleaning Recommendations

Specific Inspection Items

Details inspection items, including drawout breaker withdrawal and fixed breaker de-energization.

Functional Field Testing Procedures

Describes functional tests for manual/electrical operation using test kits.

Arc Chute Inspection Process

Primary Contact Inspection for Wear

Explains how to inspect primary contacts for wear using wear indicators.

Circuit Breaker Modifications and Changes

Rating Plug Replacement Procedure

Step-by-step instructions for replacing the rating plug, emphasizing matching ratings.

Current Sensor Replacement Procedure

Details replacing current sensors, including removing/reinstalling adaptors and disconnects.

Current Limiter Replacement for MDSL

Instructions for replacing MDSL limiters, emphasizing correct sizes and approved types.

Circuit Breaker Troubleshooting Guide

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