Eaton MDS-840 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:

S
Sara JohnsonAug 7, 2025
What to do if the Eaton MDS-840 Power Tool circuit breaker trips open?
- A
  Angela SpencerAug 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.
P
parkerjeffreyAug 21, 2025
Why does my Eaton Power Tool circuit breaker open if the fault trip indicator button is not out?
- C
  Carolyn WarnerAug 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-840 Specifications

General

Brand	Eaton
Model	MDS-840
Category	Power Tool
Language	English

Summary

SECTION 2: RECEIVING, HANDLING AND INSTALLATION

2-6 INSTALLING DRAWOUT CIRCUIT BREAKER

Procedure for installing drawout circuit breakers into their cassettes and extension rails.

SECTION 3: CIRCUIT BREAKER DESCRIPTION AND OPERATION

3-6 ELECTRONIC TRIPPING SYSTEM

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

3-8 ACCESSORY DEVICES

General information on available accessory devices for Magnum circuit breakers.

3-9 MDSL LIMITERS/BLOWN LIMITER INDICATION

Information on MDSL circuit breaker current limiters and blown limiter indication.

SECTION 6: INSPECTION AND MAINTENANCE

6-4.1 FUNCTIONAL FIELD TESTING

Procedures for performing functional tests on manually and electrically operated circuit breakers.

6-5.3 CURRENT LIMITER REPLACEMENT (MDSL)

Instructions for replacing MDSL current limiters, with specific steps for different types.

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