Littelfuse EL731 User Manual
Protection Relays & Controls
Earth-Leakage Protection–Grounded AC or DC Systems
EL731 SERIES
AC/DC Sensitive Earth-Leakage Relay
Simplified Circuit Diagram
A A
CT1 CT2
A
GROUNDED
AC SUPPLY
B
C
Description
The EL731 is
Earth-Leakage Relay that offers complete coverage for all
frequencies from 0-6,000 Hz. Two CTs are required for the
entire frequency range, or one CT can be used for only lowor high-frequency detection. An RTD/PTC sensor input
allows over-temperature protection. The EL731 offers
metering capabilities, password-protected alarm and trip
settings and optional network communications. It is used to
add low-level ground-fault protection to variable-speed
drives, and to dc currents.
GROUNDED
DC SUPPLY
a microprocessor-based AC/DC Sensitive
A
CT1
+
–
EL731 SERIES
L1
L2
(AC/DC Sensitive
Earth-Leakage Relay)
AC Mode DC Mode
For detailed wiring diagram, see adjacent page.
Ordering Information
ORDERING NUMBER
EL731-00-X0
EL731-01-X0 120/240 Vac/Vdc DeviceNet
EL731-02-X0 120/240 Vac/Vdc Profibus
EL731-03-X0 120/240 Vac/Vdc EtherNet/IP
EL731-04-X0 120/240 Vac/Vdc Modbus® TCP
EL731-10-X0 48 Vdc & 24 Vac None
EL731-11-X0 48 Vdc & 24 Vac DeviceNet
EL731-12-X0 48 Vdc & 24 Vac Profibus
EL731-13-X0 48 Vdc & 24 Vac EtherNet/IP
EL731-14-X0 48 Vdc & 24 Vac Modbus® TCP
EL731-20-X0 24 Vdc None
EL731-21-X0 24 Vdc DeviceNet
EL731-22-X0 24 Vdc Profibus
EL731-23-X0 24 Vdc EtherNet/IP
EL731-24-X0 24 Vdc Modbus® TCP
Note: When building a part number, replace the “X” with “1” for AS/NZS 2081:2011 Compliant product, “0” o therwise.
CONTROL
POWER
COMMUNICATIONS
120/240 Vac/Vdc None
™
®
™
™
®
™
™
®
™
Accessories
A
ACCESSORIES REQUIREMENT
EFCT Series CT One Required
AC700-CUA Series Com. Unit Optional
AC700-SMK Surface-Mount Kit Optional
EL731 SERIES
L1
L2
(AC/DC Sensitive
Earth-Leakage Relay)
EFCT Series Earth-Fault Current Transformer
Required zero-sequence current transformer
specifically designed for low level detection.
AC700-CUA Series
Communication Adapter
Optional network-interface and firmwareupgrade communications adapters field-install
in EL731.
AC700-SMK DIN-rail & Surface-mount
Adapter
EL731 plugs into adapter for back-plane
mounting.
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/el731
Based on Manual Rev 6-A-042613
Rev: 4-D-071813
Protection Relays & Controls
Earth-Leakage Protection–Grounded AC or DC Systems
EL731 SERIES
AC/DC Sensitive Earth-Leakage Relay
Features & Benefits
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-0500) 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
Wiring Diagram
14
19
22
25
11
10
9
8
7
6
REMOTE
RESET
13
12
OPTIONAL
NETWORK
COMM
L1
AC/DC SENSITIVE
EARTH-LEAKAGE RELAY
EL731
S21
20-6000 HZ CT
S22
SH2
S11
DC-90 HZ CT
S12
SH1
RST
GND
K1
K2
K3
RTD/PTC
ANALOG
OUT
L2/N
GND
LINE 2/NLINE 1
15
16
20
FAULT
18
21
23
24
26
NC
17
PTC RTD
TC
TC
5
4
TB
TB
+t˚
TA
TA
3
AB
2
AA
1
SUPPLY
+ –
TC
TB
TA
TERMINATION
t˚
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,
24 to 12 AWG (0.2-2.5 mm2)
Communications EtherNet/IP™, DeviceNet™, Profibus®,
Modbus
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,
®
TCP (optional)
C-Tick (Australia)
Warranty 5 years
Mounting Panel; Surface and DIN (with optional
AC700-SMK)
Littelfuse reserves the right to make product changes, with out notice. Material in this do cument is as accurat e as known at th e time of publica tion. Visit Li ttelfuse.com fo r the most up-to-date information.
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/el731
Based on Manual Rev 6-A-042613
Rev: 4-D-071813
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