Protection Relays and 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)
Frequency range (0-90 Hz, 20-6,000 Hz)
32-char OLED display
Local LED indication
Adjustable trip setting provides a wide range of low-level protection and system coordination
Operate in either AC or DC mode or both. Use single or combined ranges. Separate metering
Earth-leakage metering, setup and programming
Visual Trip, Alarm, CT connection indication
CT-Loop monitoring
Alarms when CT is not connected
Analog output (4-20 mA)
Adjustable time delay
Alarm and trip settings
Temperature-sensor input
Output contacts
Connect to DCS. Allows connection to an optional meter (PGA-0520) or control system
Adjustable trip delay for quick protection and system coordination
Detect a deteriorating condition before damage occurs
Drive or motor temperature protection
3 programmable: Operate 2 alarm and 1 trip circuit
Optional connection to plant network
Network communication
Harmonic filtering
Eliminates nuisance tripping due to harmonic noise
No required calibration saves maintenance cost
Microprocessor based
Universal power supply
Provides flexibility for numerous applications
Wiring Diagram
Specifications
IEEE Device Numbers
AC ground fault (50G/N, 51G/N),
LINE 1
LINE 2/N
OPTIONAL
NETWORK
COMM
DC ground fault (79G),
PTC overtemperature (49),
RTD temperature (38, 49)
120/240 Vac/Vdc, 24 Vdc,
48 Vdc/24 Vac
L1
14
L2/N 15
GND
16
AC/DC SENSITIVE
EARTH-LEAKAGE RELAY
Supply Voltage
EL731
K1
20
Trip Level Settings
Alarm Level Settings
Trip Delay
Output Contacts
Contact Operating Mode Fail-safe & non-fail-safe
Reset
Freq. Response, CT1
Freq. Response, CT2
30-5,000 mA AC and DC
30-5,000 mA AC and DC
0.05-2 s
FAꢀLT
19
22
18
21
K2
K3
3 Form C (programmable)
23
24
Front panel and remote
0-90 Hz
20-6,000, 190-6,000, 20-90, 20-3,000 Hz;
selectable
EFCT-x series
Open & short detection
Plug-in, wire clamping,
24 to 12 AWG (0.2-2.5 mm2)
EtherNet/IP™, DeviceNet™, Profibus®,
Modbus® TCP (optional)
4-20 mA (selectable 0-5 A or
0-100% trip-level setting)
Standard feature
25
11
26
S21
NC
17
Current Transformer
CT Detection
Terminals
EFCT-X
EFCT-X
20-6000 HZ CT
10
9
S22
PTC
+t˚
RTD
t˚
TC
TB
TA
TC
TC
5
4
3
SH2
RTD/PTC
TB
TA
TB
TA
8
S11
Communications
Analog Output
DC-90 HZ CT
S12
7
6
SUPPLY
+ –
SH1
AB
AA
2
1
ANALOG
PGA-0520
4-20mA
Conformal Coating
Dimensions
OUT
RST
13
12
REMOTE
RESET
H 48 mm (1.9”); W 96 mm (3.8”);
D 129 mm (5.0”)
GND
Approvals
UL Listed (E340889), CSA,
RCM (Australia), CE
Warranty
Mounting
5 years
Panel; Surface and DIN (with optional
AC700-SMK)
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.
Rev: 4-F-040716
Based on Manual Rev 6-F-031116
© 2016 Littelfuse Protection Relays & Controls
Littelfuse.com/el731
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