Protection Relays and Controls

© 2016 Littelfuse Protection Relays & Controls

14 L1

L2/N

GND

NC

TC

TB

TA

TC

TB

TA

TC

PTC

RTD

PGA-0520

4-20mA

EFCT-X

EFCT-X

SUPPLY

t˚

+t˚

TB

TA

AB

AA

ANALOG

OUT

REMOTE

RESET

RTD/PTC

LINE 2/N

LINE 1

OPTIONAL

NETWORK

COMM

FAULT

20-6000 HZ CT

DC-90 HZ CT

RST

GND

SH1

S12

S11

SH2

S22

S21

19

K1

22

25

K2

K3

20

16

15

18

21

23

24

26

17

2

1

5

4

3

11

10

9

8

7

6

13

12

AC/DC SENSITIVE

EARTH-LEAKAGE RELAY

EL731

+ –

Specifications

IEEE Device Numbers

AC ground fault (50G/N, 51G/N),

DC ground fault (79G),

PTC overtemperature (49),

RTD temperature (38, 49)

Supply Voltage

120/240 Vac/Vdc, 24 Vdc,

48 Vdc/24 Vac

Trip Level Settings

30-5,000 mA AC and DC

Alarm Level Settings

30-5,000 mA AC and DC

Trip Delay

0.05-2 s

Output Contacts

3 Form C (programmable)

Contact Operating Mode Fail-safe & non-fail-safe

Reset

Front panel and remote

Freq. Response, CT1

0-90 Hz

Freq. Response, CT2

20-6,000, 190-6,000, 20-90, 20-3,000 Hz;

selectable

Current Transformer

EFCT-x series

CT Detection

Open & short detection

Terminals

Plug-in, wire clamping,

Communications

Analog Output

4-20 mA (selectable 0-5 A or

0-100% trip-level setting)

Conformal Coating

Standard feature

Dimensions

H 48 mm (1.9”); W 96 mm (3.8”);

D 129 mm (5.0”)

Approvals

UL Listed (E340889), CSA,

RCM (Australia), CE

Warranty

5 years

Mounting

Panel; Surface and DIN (with optional

AC700-SMK)

FEATURES

BENEFITS

Adjustable pickup (30-5,000 mA)

Adjustable trip setting provides a wide range of low-level protection and system coordination

Frequency range (0-90 Hz, 20-6,000 Hz)

Operate in either AC or DC mode or both. Use single or combined ranges. Separate metering

32-char OLED display

Earth-leakage metering, setup and programming

Local LED indication

Visual Trip, Alarm, CT connection indication

CT-Loop monitoring

Alarms when CT is not connected

Analog output (4-20 mA)

Connect to DCS. Allows connection to an optional meter (PGA-0520) or control system

Adjustable time delay

Adjustable trip delay for quick protection and system coordination

Alarm and trip settings

Detect a deteriorating condition before damage occurs

Temperature-sensor input

Drive or motor temperature protection

Output contacts

3 programmable: Operate 2 alarm and 1 trip circuit

Network communication

Optional connection to plant network

Harmonic filtering

Eliminates nuisance tripping due to harmonic noise

Microprocessor based

No required calibration saves maintenance cost

Universal power supply

Provides flexibility for numerous applications

Features & Benefits

Wiring Diagram

Earth-Leakage Protection–Grounded AC or DC Systems

EL731 SERIES

AC/DC Sensitive Earth-Leakage Relay

Littelfuse reserves the right to make product changes, without notice. Material in this document is as accurate as known at the time of publication. Visit Littelfuse.com for the most up-to-date information.

Littelfuse.com/el731

Rev: 4-F-040716

Based on Manual Rev 6-F-031116