Eaton MDS-C20 - 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:

R
Rachel BestAug 6, 2025
What to do if the Eaton MDS-C20 Power Tool circuit breaker trips open?
- I
  iellisAug 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.
L
Lisa JonesAug 20, 2025
Why does my Eaton MDS-C20 circuit breaker open if the fault trip indicator button is not out?
- C
  Christy HicksAug 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-C20 Specifications

General

Brand	Eaton
Model	MDS-C20
Category	Power Tool
Language	English

Summary

Safety Information

General Safety

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

Safety Warnings

Highlights personnel safety and equipment protection from damage due to warnings.

Introduction to Magnum Circuit Breakers

Magnum Breaker Safety Features

Details built-in interlocks and safety features for hazard reduction and proper sequences.

Essential Safety Practices

Lists essential safety practices for personnel working with circuit breakers.

Qualified Personnel Requirements

Defines the qualifications and knowledge required for personnel operating and maintaining breakers.

Receiving, Handling, and Installation Guide

Installing Drawout Circuit Breakers

Understanding Rejection Interlocks

Explains the function of rejection interlocks to prevent incompatible breaker insertion.

Levering Circuit Breakers into Compartment

Circuit Breaker Description and Operation

Operating Mechanism Overview

Manual Operation Procedures

Electrical Operation Procedures

Anti-Pump Feature Functionality

Explains both mechanical and electrical anti-pump features to prevent repeated closing on faults.

Electronic Tripping System Overview

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

Microprocessor-Based Trip Unit

Introduces the Digitrip RMS trip unit family and their features.

Rating Plug Functionality

Explains the function and importance of matching the rating plug to sensors and NEC requirements.

Current Sensor Installation and Function

Details the installation and function of toroidal current sensors for load current measurement.

Trip Actuator Mechanism

Making Current Release Safety Feature

Describes the safety feature that prevents closing on faulted circuits.

High Instantaneous Trip Option

Details the high instantaneous trip option for specific applications and fault levels.

Inspection and Maintenance Procedures

General Inspection and Maintenance Importance

Emphasizes the importance of regular inspection and maintenance for breaker longevity.

Specific Inspection Points

Functional Field Testing Procedures

Outlines functional tests for drawout circuit breakers, including mechanism and electrical operation.

Primary Contact Inspection Method

Circuit Breaker Modifications and Changes

Rating Plug Replacement Procedure

Details the steps for removing and installing a new rating plug.

Current Sensor Replacement Procedure

Explains the procedure for replacing current sensors, including necessary preparations.

MDSL Current Limiter Replacement

Provides instructions for replacing MDSL current limiters, with specific steps for MA, MB, and MD types.

Troubleshooting Circuit Breakers

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