"Safety" ELR-8V Differential Protection
Widap AG
Lausanne
Key information
- Publication date:31 October 2025
- Workload:100%
- Contract type:Unlimited employment
- Place of work:Lausanne
Job summary
The ELR-8V is a differential earth leakage relay designed for safety. It offers adjustable sensitivity and response times for optimal protection.
Tasks
- Monitor differential current continuously with CT-1 transformer.
- Customize alarm settings and response functions easily.
- Install on 2-4 conductor networks for effective operation.
Skills
- Requires knowledge of electrical systems and relay configurations.
- Familiarity with EN 62020 standards and specifications.
- Ability to troubleshoot and maintain electrical devices.
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ELR-8V Protection
differential
ELR-8V
Earth Leakage Relay / earth differential relay
HOLD
ON
OFF
I (A)
20 A
200 A
1.5
2
0.2
0.3
1
2.5
0.1
0.4
0.6
0.3
3 ON ALARM TRIP
0.03
0.5
I n(A) alarm off alarm on t (sec) tx 10 tx 1
I x1
I x0.1
I x10
FS trip off
TEST
RESET
FS alarm off
FAIL SAFE
SYSTEME AG
Description of functions
The ELR-8V differential current monitoring relay (fault or leakage current) is a relay for front panel mounting 96x96 according to DIN 43700. The relay is available with or without differential current display. Combined with a differential measuring transformer of the series
CT-1 the ELR-8V allows permanent monitoring of the differential current (alternating, pulsed according to EN 6220 RCM Type A), signaling an alarm or tripping the monitored installation if necessary. The differential current monitoring system is designed for installation on 2-, 3- or 4-conductor networks (TN-/TT systems). The trip sensitivity is continuously adjustable from 0.03 to 30 A. The response delay is continuously adjustable from 0.03 to 5 seconds. The alarm is activated at 70% of the programmed threshold. The output relay functions can be individually programmed in work (relay energized as long as the threshold is exceeded) or rest (relay energized as long as the threshold is not reached).
Measuring devices - Systems - Equipment
For the control and optimization of electrical energy use
Brüelstrasse 47 CH-4312 Magden Telephone ++41(0)61 845 91 45 Fax ++41(0)61 845 91 40 E-Mail: elko@elko.ch Internet: www.elko.ch
French-speaking Switzerland: bb-tronic Sàrl, P.O. Box 43, CH-1018 Lausanne
Telephone ++41(0)21 647 18 65 Fax: ++41(0)21 647 18 67 E-Mail: bb-tronic@bluewin.ch
Programming / functions
4
ELR-8V
Earth Leakage Relay / earth differential relay
10
HOLD
ON
OFF
9
I (A)
20 A
200 A
2
1
1.5
2
0.2
0.3
1
2.5
0.1
0.4
0.6
0.3
3
ON ALARM TRIP
0.03
0.5
I n(A) alarm off alarm on t (sec) tx 10 tx 1
8
I x1
7
I x0.1
I x10
FS trip off
TEST
RESET
FS alarm off
FAIL SAFE
5
6
SYSTEME AG
3
Legend
1.
Potentiometer for continuous adjustment of reaction time
(0.03 : 0.5 sec. / 0.3 : 5 sec.)
2.
Potentiometer for continuous adjustment of trip thresholds
(0.03 : 0.3 A / 0.3 : 3 A / 3 : 30 A)
3.
6-position dipswitches for function selection
Alarm 70%
Delay
Measuring range
Off
EN
0.03 : 0.5 0.3 : 5.0
0.03 : 0.3 0.3 : 3.0
3 : 30
Seconds Seconds
Amp.
Amp.
Amp.
Output functions
Alarm signaling output functions
Rest
Work
Rest
Work
4.
3-position dipswitches, Display
Display indicates
Display
Alarm
Value
Full
Full current high value
scale 20 A scale 200A
5.
Test button
6.
Reset button
7.
Green LED (On), lit when the device is in service
8.
Red LED, lit when the programmed value is exceeded (output active)
9.
Red LED, lit when 70% of the programmed value is exceeded (Alarm output active)
Connection diagrams
Auxiliary control power
L1 L2 L3 N
Contactor
Installation side
Button
On
Relay output with work function
(Relay on if threshold exceeded)
.
Important!
The contactor conductor must never pass through the current converter
789 456
1
11
1
Auxiliary power
INPUT
TRIP ALARM/TRIP
1 - 2 110 - 127 VAC
2
12
Vaux 2
CT - 1 /:
2 - 3 220 - 240 VAC
3
13
3
1 - 3 380 - 415 VAC
TEST
4
14
15
RESET
16
ELR-8V
17 18 19 20 21 22
Load
Auxiliary control power
L1 L2 L3 N
Contactor installation side
Output relay rest function
(Relay on if threshold not reached
.
Important!
The contactor conductor must never pass through the CT current converter
789 456
1
11
1
Auxiliary power
INPUT
TRIP ALARM/TRIP
1 - 2 110 - 127 VAC
2
12
Vaux 2
CT - 1 /:
2 - 3 220 - 240 VAC
3
13
3
1 - 3 380 - 415 VAC
TEST
4
14
15
RESET
16
ELR-8V
17 18 19 20 21 22
Load
Technical data
Designation
ELR8V
Order number
0.01.031
Pulse differential current monitoring device RCM Type A
Device description according to EN
Note: the RCM device with auxiliary power does not replace FI
62020 according to NIN!
0.03 : 0.3 A // 0.3 : 3.0 A // 3 : 30 A
Fault current sensitivity
Continuously adjustable within the selected range
0.03 : 0.5 Seconds // 0.3 : 5.0 Seconds
Reaction time
Continuously adjustable within the selected range
Alarm output: on exceeding 70% of the programmed fault current
Reaction sensitivity
Signaling output: on exceeding the programmed fault current
Insulation test
2.5 kV // 60 Seconds
Service: between -10°C and 60°C
Climatic conditions
Storage: between -20°C and 80°C
For relative humidity < 90% RH, non-condensing
Reference standard:
EN 62020, EN60255-22-2, IEC 1000-4-2, DIN 40050
Output relay
5 A 250 V AC1 (resistive load)
Mounting
Front panel DIN 437000
Connection
Plug-in terminal block (2.5 mm2)
Housing
Plastic, self-extinguishing (VO)
Protection
IP 20 (DIN 40050)
Weight approx. approx. 250 gr.
Dimensions ELR-8V
9
86
16
el ba m h m m co r m
6 b 0
9
é9 x drx
6 ei
0
9
9 nr oB
Cutout 92x92 mm
CT - Fault current converter
H
Dimensions in mm
Type
Order no.
ABCDEFGH
CT - 1/35 35 100 60 110 47 50 43
30
01.01.101
CT - 1/60 60 100 60 110 47 50 43
30
01.01.102
D
CT - 1/80 80 150 110 160 70 50 43
30
A
01.01.103
CT - 1/110 110 150 110 160 70 50 43
30
01.01.104
E
CT - 1/160 160 220 - 270 130 44 - 44
01.01.105
CT - 1/210 210 300 240 300 150 135 105 40
01.01.106
5
5
C
G
B
F
Important!
The size of the CT converters depends on the diameter of the conductors passing through the center.
