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1. Introduction

Eaton Arc Flash Relay System

   MN026010EN   March 2016   www.eaton.com

1. Introduction

The Eaton Arc Flash Relay (EAFR) system is a combination 

of arc flash relay modules and sensors designed to detect 

and clear arc flash events in low and medium voltage elec-

trical assemblies.
An arc fault is the most devastating type of fault in medium 

voltage (MV) and low voltage (LV) switchgear.  If an arc fault 

occurs, the EAFR system reduces arc energy by quickly 

clearing the current feeding the arc.
The EAFR system can measure both light and current to 

eliminate nuisance operation. In addition, it’s modular design 

makes it an excellent candidate for both new and retrofit 

installations.

2. Overview

2.1 Speed

As fast as 2 ms operate time.

2.2 Flexibility

Easy adaptation to any switchgear and trip scheme.

Variety of arc sensors available.

Long distance possible between units.

Practically an unlimited number of units can be intercon-

nected in one system.

2.3 Reliability

Standard copper wire for communication between units.

Superior isolation levels for external disturbances - tested 

at the highest EMC classes.

Full internal monitoring of all system components and 

interconnections.

2.4 Typical Applications

Low voltage switchgear/switchboards

Medium voltage switchgear

Low/medium voltage motor control

3. Features

3.1 Protection Features

The EAFR system is a sophisticated micro-processor based 

arc flash protection system with combined current and arc 

sensing. Combined current and arc sensing provides an 

integrated dual trip criteria. It is designed to minimize the 

damage caused by an arcing fault (arc flash) by tripping the 

circuit breaker sourcing the fault current. 

Three phase instantaneous overcurrent elements (50P) 

(Permissive only with light input)

Ground instantaneous overcurrent element (50G) 

(Permissive only with light input)

Breaker failure (50BF)

3.2 Current Sensing

The main units EAFR-110F and EAFR-110P each contain 

four current transformer inputs that provide sensing for the 

phase and ground instantaneous overcurrent elements.  

These elements act as a permissive for the light sensing 

inputs so that when they are incorporated into the scheme 

both current and light must be present to initiate a trip com-

mand.  This current information can be shared with down-

stream modules as well.

3.3 Light Sensing

Arc flash light can be collected by either point sensors or 

fiber loop sensors.  Up to 12 point sensors or 3 loop sen-

sors can be connected to each module.  Light sensing can 

initiate a breaker trip independent of current if desired.  

Because point sensors are interconnected with copper wire 

they can provide a much better installation for Electrical 

OEM’s where the system can be fully wired and tested in 

the factory.  Sensor wiring allows daisy chaining up to three 

sensors over a distance of 100 meters.  Fiber loop sensors 

are available in either plastic or glass versions.  Point sen-

sors are available in multiple sensitivity levels with the 8K 

lux sensor being suitable for most applications.

Point sensors

Up to 12 sensors per module

Fiber loop sensors

Up to 3 sensors per module

3.4 Relay Outputs

Four Trip Relays per module (7 mS)

Two High Speed outputs (2 mS – EAFR-110P, EAFR-110F)

System failure relay

Summary of Contents for EAFR-110F

Page 1: ...Eaton Arc Flash Relay System EAFR 110F EAFR 101 MN026010EN...

Page 2: ...ICULAR PURPOSE OR MERCHANTABILITY OTHER THAN THOSE SPECIFICALLY SET OUT IN ANY EXISTING CONTRACT BETWEEN THE PARTIES ANY SUCH CONTRACT STATES THE ENTIRE OBLIGATION OF EATON THE CONTENTS OF THIS DOCUME...

Page 3: ...eaker Failure 2 3 8 Communications 2 4 EATON ARC FLASH RELAY MODULES 5 5 DIMENSIONS 6 6 EATON ARC FLASH RELAY SENSORS 8 7 TECHNICAL DATA 9 7 1 Protection Stages 9 7 2 Current Measuring Circuits 9 7 3...

Page 4: ...iv MN026010EN Eaton Arc Flash Relay System MN026010EN March 2016 www eaton com...

Page 5: ...egrated dual trip criteria It is designed to minimize the damage caused by an arcing fault arc flash by tripping the circuit breaker sourcing the fault current Three phase instantaneous overcurrent el...

Page 6: ...er the set time delay 3 8 Communications Because of the simplicity of the system all monitoring is done through contact outputs on the modules The advan tage of this approach is that cybersecurity iss...

Page 7: ...Eaton Arc Flash Relay EAFR 101 EAFR 101 ERROR T1 T3 T4 T2 T4 POWER SET S1 S2 S3 S4 S5 BI1 BI2 BO1 Eaton Arc Flash Relay EAFR 101 EAFR 101 ERROR T1 T3 T4 T2 T4 POWER SET S1 S2 S3 S4 S5 BI1 BI2 BO1 Eato...

Page 8: ...010EN March 2016 www eaton com Figure 4 Single Ended Substation Using Fiber Loop Sensors and External Current Input A T1 T2 S2 BI 1 CB CB CB S1 S3 E Series CB CB EAFR 102 ERROR T1 T3 T4 T2 T4 POWER SE...

Page 9: ...Modules Features EAFR 110F EAFR 110P EAFR 102 EAFR 101 D 3 Phase Current Detection Yes Yes No No Ground Current Detection Yes Yes No No Maximum Point Sensors 0 12 0 12 Maximum Fiber Loop Sensors 3 0...

Page 10: ...IP 1 TRIP 2 SEN 1 SEN 2 SEN 3 SEN 4 FIBER I IN L OUT M TRIP L1 L2 L3 Io BO1 BO2 ARC PROTECTION SET AQ 1 10 157 6 18 82 3 23 164 6 46 102 4 01 EAFR 110P ERROR POWER SET T1 T2 S1 IL1 S2 IL2 S3 IL3 S4 Ig...

Page 11: ...ns in Millimeters inches Side View Figure 11 EAFR 101D Dimensions in Millimeters inches Side View 175 6 89 157 6 18 160 6 30 10 0 39 17 0 67 48 5 1 91 10 0 39 110 4 33 145 5 71 21 5 0 85 108 4 25 34 1...

Page 12: ...026010EN March 2016 www eaton com 6 Eaton Arc Flash Relay Sensors Figure 13 EAFR 06 Arc Light Plastic Fiber Sensor Figure 14 EAFR 07 Arc Light Glass Fiber Sensor Figure 15 EAFR 01 A Point Sensor Figur...

Page 13: ...Carry 2 A Make and Carry for 0 5 s 15 A Make and Carry for 3s 6 A Breaking Capacity DC When Time Constant L R 40 ms 1 A 110 W Contact Material Semiconductor 7 5 Binary Output BO1 Rated Voltage 24 Vdc...

Page 14: ...package 7 11 Environmental Conditions Specified Ambient Service Temp Range 35 to 70 C 31 to 158 F Transport and Storage Temp Range 40 to 70 C 40 to 158 F Relative Humidity Up to 97 7 12 Approvals UL...

Page 15: ...glass fiber sensor 20 m 65 62 ft EAFR 07 25 65C2014G04 Arc light glass fiber sensor 25 m 82 02 ft EAFR 07 30 65C2014G05 Arc light glass fiber sensor 30 m 93 43 ft EAFR 07 35 65C2014G06 Arc light glas...

Page 16: ...rd Cleveland OH 44122 United States Eaton com 2016 Eaton All Rights Reserved Printed in USA Publication No MN026010EN TBG1274 March 2016 Eaton is a registered trademark All trademarks are property of...

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