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Network protector solutions

CM52 advanced dead-front network protector

Eaton’s CM52 network protector is a low-maintenance network protector that virtually eliminates adjustments, is easy to troubleshoot and has built-in diagnostics. It has the highest interrupting rating in the industry and is the only network protector to carry both a UL certification and BIL rating. It is designed to handle ratings 800 to 4500 A, 216 to 600 V. Testing is quick and safe with a four-position, dead-front, draw-out design. 

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Modular design
Standardisation and inventory reduction
Designed for quick and safe testing
Improve safety and reduce maintenance costs
Deadfront design
Advanced technology for arc flash safety

Core features

  • Enclosures: Submersible or NEMA
  • Deadfront and draw-out
  • Fuse mountings: Internal or external
  • 800 A – 4500 A
  • 216 V, 480 V, 600 V, dual voltage
  • Network protector arc flash reduction maintenance system (NPARMS)
  • Remote racking (RemRack)
  • Stacklight

CM52 network protector overview

Learn why Eaton's CM52 is the industry’s most modern network protector available today. This dead-front design is available with numerous arc-flash safety features. 

Designed to reduce maintenance time

Featuring four-position, draw-out, dead-front circuit breaker and standardise modular components, Eaton’s CM52 network protector helps to reduce maintenance time, lower inventory costs and simplify training for crews.

The benefits of robust legacy network protectors along with improved user and operational safety

The CM52 network protector is comprised of an enclosure assembly, breaker element and relay module. Additional features include the stacklight submersible visual indication device, VisoBlock visible break, RAD remote access device, bulkhead junction box, visible-break windows and quick latches.

Improved safety in the network

Eaton’s CM52 network protector allows for improved safety and more reliable protection on a network system due to higher ratings and advanced technology additions than legacy protector models.

Remote racking (RemRack)

Eaton’s CM-52 remote racking device provides a means of remotely connecting and disconnecting a network protector from the energised buswork. This is done while the door of the network protector remains bolted shut. This device helps mitigate any chance of arc flash exposure risk while disconnecting or re-connecting.
Watch how to use remote racking on a CM52 network protector
Specifications

Ratings

Maximum design voltage (V)
 600  
Impulse withstand voltage (kV BIL)
 10  
Maximum continuous current rating (50/60 Hz) (A)
 800 to *6200  
Load break current, (50/60 Hz) (A)
 800 to *6200
  
Sym interrupting rating (kA)
 42 to 85
  
Withstand rating (kA)
 42 to 85
  
Sym fault close and latch rating (kA)
 35 to 65
  
Mechanical operations
 10,000
  
*6200 A ratings available in open frame styles only    

Standards

IEEE standard requirements for secondary network protectors
 IEEE Std C57.44-2014
  
IEEE standard for secondary network transformers subway and vault types (liquid and immersed) requirements
 IEEE Std C57.40-2011
  

Enclosure

1/4“ Copper bearing steel, submersible  
316 stainless steel, submersible  
NEMA 4 non-submersible  

Accessories

Relay
 MPCV sequence-based relay
  
Visible isolation
 Rem-Rack (remote racking)
  
Visual indication
 Stacklight
  
Secondary visual disconnect
 VisoBlock
  
Wireless communication
 RAD (remote access device)
  
Diagnostics
 IDM (indicating module)
  
Arc flash mitigation
 NPARMS (arc flash reduction maintenance system)
  
Surge protection
 TripSafe
  
Remote operation
 Pendant/RAD/VaultGard/HMI
  

System

Grid Networks
 Up to 600 V
Spot Networks
 Up to 600 V
Communications
 VaultGard, NPServe and RAD compatible
Download Links
  • CM52 network protector product aid
    This brochure describes Eaton’s CM52 network protector which leverages proven Eaton power breaker technology to deliver a versatile solution that captures all the benefits of robust legacy network protectors while enhancing user and operational safety.
    (PDF 427 KB , 28/02/2019)
  • Eaton network protector recycling program
    This document answers questions about the network protector recycling program
    (PDF 392 KB , 21/12/2023)
  • G-52-E replacement breaker product aid
    This brochure describes how Eaton’s G-52-E direct roll-in replacement breaker for the MG8/9 enclosure has all of the advantages of the G-52-E breaker and fits securely inside the original enclosure, with no modifications required.
    (PDF 6 MB , 01/10/2010)
  • CM52 network protector catalog
    This catalog provides features and specifications for Eaton’s CM52 network protector which delivers an unsurpassed state-of-the-art dead-front network protector providing the highest performing and highest rated product for network solutions available.
    (PDF 3 MB , 13/05/2019)
  • CM52 network protector parts catalog
    This catalog contains the part-number information for Eaton's CM52 network protector.
    (PDF 2 MB , 05/05/2019)
  • Secondary network arc flash case study
    The purpose of this white paper is to share secondary network arc flash event details and help create a safer environment through technology for those working in these applications.
    (PDF 151 KB , 06/09/2018)
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