Eaton EAFR-101S, User Manual

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1. Introduction

EAFR-101S Arc Point Sensor Relay User Manual

   MN026005EN   February 2016   www.eaton.com

1. Introduction

Read these instructions carefully and inspect the equipment 

to become familiar with it before trying to install, operate, 

service, or maintain it.
Electrical equipment should be installed, operated, ser-

viced, and maintained only by qualified personnel.  Local 

safety regulations should be followed.  No responsibility is 

assumed by Eaton for any consequences arising out of the 

use of this material.
Eaton reserves right to changes without further notice.

1.1 Abbreviations

CB 

–  Circuit breaker

CBFP 

–  Circuit breaker failure protection

EMC 

–  Electromagnetic compatibility

EPROM  –  Erasable programmable read only memory
HW 

– Hardware

LED 

–  Light emitting diode

LV 

–  Low voltage

ms 

– Millisecond

MV 

–  Medium voltage

NC 

–  Normally closed

NO 

–  Normally open

PMSG 

–  Permanent magnet synchronous generator

Rx 

– Receiver

SF 

–  System failure

SW 

– Software

Tx 

– Transceiver

uP 

– Microprocessor

2. General

The Eaton Arc Flash Relay 101S (EAFR-101S) is a sophisticat-

ed micro-processor based arc flash protection relay includ-

ing complete self-supervision functionality.  It is designed to 

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

sensing light from the point sensor and tripping the circuit 

breaker sourcing the fault current.  The EAFR-101S complete 

system self-supervision function provides the highest level 

of dependability by continuously monitoring all internal sys-

tem functions along with external connections.
The EAFR-101S is designed according to the latest protec-

tion relay standards and is therefore suitable for installations 

in rough environments, such as utility, traditional or renew-

able power plants, off shore, marine, oil and gas, mining, 

steel, or any other heavy industry applications.  It is also 

well suited for commercial and institutional electrical sys-

tems.  The EAFR-101S is suitable for either medium voltage 

or low voltage switchgear and motor control center applica-

tions in both new and retrofit installations.

2.1 EAFR-101S Features

The EAFR-101S is a multipurpose arc flash protection relay 

that can receive light from four different channels of light 

point sensors and can be applied for variety of applications.  

The EAFR-101S can be used as a stand-alone relay or as 

part of a more complex arc protection system through the 

binary bus.
Main features of EAFR-101S:

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(110-220) Vac / (125-250) Vdc auxiliary power supply;

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Four arc point sensor channels (S1, S2, S3, and S4);

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Six binary inputs (BI1, BI2, BI3, BI4, BI5, and BI6) nominal 

voltage of 24 Vdc;

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Three normally open trip relay outputs with direct trip  

circuit rated contacts (T1, T2, and T3);

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One normally open electronic lock-out trip relay with 

direct trip circuit rated contacts (T2);

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Three 24 VDC binary outputs (BO1, BO2, and BO3);

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One system failure relay, form C output (SF);

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17 indication LEDs; and

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One push-button (SET).