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1. Introduction
EAFR-101 Arc Point Sensor Relay User Manual
MN026004EN 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 101 (EAFR-101) is a sophisticated
micro-processor based arc flash protection relay including
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-101 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-101 is designed according to the latest protection
relay standards and is therefore suitable for installations in
rough environments, such as utility, traditional or renewable
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 systems.
The EAFR-101 is suitable for either medium voltage or low
voltage switchgear and motor control center applications in
both new and retrofit installations.
2.1 EAFR-101 Features
The EAFR-101 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-101 can be used as a stand-alone relay or as part
of a more complex arc protection system through the binary
bus. The EAFR-101 comes in 2 mounting styles. EAFR-101
is a vertical panel or door mounted package and the EAFR-
101D is a horizontal DIN rail package.
Main features of EAFR-101:
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(110 to 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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Two binary inputs (BI1 and BI2) nominal voltage of
24 Vdc;
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Three normally open trip relay outputs with direct trip
circuit rated contacts (T1, T2, and T4);
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One normally open (EAFR-101, EAFR-101D) or normally
closed (EAFR-101B, EAFR-101DB) electronic lock-out trip
relay with direct trip circuit rated contacts (T3);
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One 24 Vdc binary output (BO1);
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One system failure relay, form C output (SF);
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11 indication LEDs; and
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One push-button (SET).
