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Eaton MDS-C5N - User Manual

Eaton MDS-C5N
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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

  • W
    William NguyenAug 6, 2025
    What to do if the Eaton MDS-C5N circuit breaker trips open?
    • D
      Danielle MaldonadoAug 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.
  • A
    Alexis NunezAug 22, 2025
    Why does my Eaton MDS-C5N circuit breaker open if the fault trip indicator button is not out?
    • W
      Whitney MercadoAug 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.

Summary

General Information

Safety

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

Introduction

General Information

Details Magnum DS, DSX, and DSL circuit breakers, their configurations, ratings, and construction.

Safety Features

Highlights built-in interlocks and safety features to reduce hazards and ensure proper operating sequences.

Safety Practices

Provides essential safety practices for personnel working with circuit breakers.

Qualified Personnel

Defines qualifications for personnel involved in operating and maintaining circuit breakers.

Receiving, Handling and Installation

Lifting Circuit Breaker

Details safe lifting procedures and precautions for circuit breakers using appropriate equipment.

Installing Drawout Circuit Breaker

Guides the installation of drawout circuit breakers into cassettes using extension rails.

Rejection Interlocks

Explains the function of rejection interlocks to prevent insertion of incompatible circuit breakers.

Circuit Breaker Positioning

Describes the four normal positions for drawout circuit breakers: Remove, Disconnect, Test, Connect.

Circuit Breaker Description and Operation

MDSL Application;Operation

Details MDSL circuit breaker applications requiring overload and switching functions beyond breaker ratings.

Operating Mechanism

Describes the cam and spring design, stored energy mechanism, and manual/electrical operation.

Anti-Pump Feature

Details both mechanical and electrical anti-pump features to prevent automatic reclosing after tripping.

Electronic Tripping System

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

Microprocessor-Based Trip Unit

Discusses Digitrip RMS trip units, their features, and field interchangeability.

Rating Plug

Explains the rating plug's function in identifying sensors, setting instantaneous trip, and NEC compliance.

Current Sensors

Describes the toroidally wound current sensors installed at the rear terminals for load current sensing.

Making Current Release

Describes the safety feature that prevents closing on a faulted circuit, tripping instantaneously.

High Instantaneous Trip Option (Magnum DS Only)

Details the high instantaneous trip option for 800-3200A breakers to handle 100kA faults with selectivity.

Accessory Devices

Plug-in Electrical Accessories

Describes four plug-in accessories: Shunt Trip, Spring Release, Undervoltage Release, and Auxiliary Switch.

Shunt Trip

Spring Release

Undervoltage Release

Motor Operator

Inspection and Maintenance

General

Emphasizes the importance of regular inspection, cleaning, and maintenance for equipment reliability.

What to Inspect

Functional Field Testing

Outlines functional tests for drawout breakers to check operation and mechanism.

Arc Chute Inspection

Primary Contact Inspection

Rating Plug Replacement

Current Sensor Replacement

Current Limiter Replacement (MDSL)

Troubleshooting

Introduction

Guides users in identifying causes and corrective actions for simple circuit breaker problems.

Eaton MDS-C5N Specifications

General IconGeneral
BrandEaton
ModelMDS-C5N
CategoryPower Tool
LanguageEnglish

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