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Ground Fault Relay
K6EL
CSM_K6EL_DS_E_9_3
Economical, Compact, High-performance,
DIN 48 × 48-mm Ground Fault Relay for Low
Voltages
• Performs continuous monitoring and detection of ground faults
in low-voltage circuits due to the deterioration of insulation in
electrical devices.
• Higher reliability ensured with improved resistance to high-frequency noise when used for inverter loads.
• Ground Fault Relays and through-type ZCTs (zero-phase current transformers) are mutually compatible.
• The through-type ZCTs are equipped with test terminals, allowing operation tests for Ground Fault Relays to be performed with
ease.
Model Number Structure
■ Model Number Legend
K6EL-@@
1
2 3
1. Ground Fault Relay
2. Operating Time and Reset Method
None: 0.1 s manual reset
A:
0.3/0.8 s (switchable) manual reset
3. Sensed Current
30: 30 mA (fixed)
100: 100 mA/200 mA (switchable)
200: 200 mA/500 mA (switchable)
500: 500 mA/1,000 mA (switchable)
Ordering Information
■ List of Models
Ground Fault Relays
Type
High-sensitivity
models
Sensed current
Type
30 mA (fixed)
Operating time
Medium-sensitivity models
100 mA/200 mA
(switchable)
200 mA/500 mA
(switchable)
500 mA/1,000 mA
(switchable)
High-speed models
Less than 0.1 s
K6EL-30
K6EL-100
K6EL-200
K6EL-500
Delayed models
0.3/0.8 s (switchable)
---
K6EL-A100
K6EL-A200
K6EL-A500
ZCTs (Zero-phase Current Transformers)
Type
Rated current
Indoor through-type models
Sensed current
Model
Indoor separate-type models
Diameter of through-hole
Model
Diameter of through-hole
50 A
OTG-L21
21 mm
---
---
100 A
OTG-L30
30 mm
---
---
200 A
OTG-L42
42 mm
OTG-CN52
52 mm
400 A
OTG-L68
68 mm
OTG-CN77
77 mm
600 A
OTG-L82
82 mm
OTG-CN112
112 mm
1,000 A
OTG-L156
156 mm
---
---
1
K6EL
■ Ground Fault Relay and ZCT Combinations
(OK: Compatible)
Ground Fault Relay
K6EL-30
K6EL-100, -200, -500
K6EL-A100, -A200, -A500
ZCT
OTG-L21 (50 A)
OK
OK
OTG-L30 (100 A)
OK
OK
OTG-L42 (200 A)
OK
OK
OTG-L68 (400 A)
---
OK
OTG-L82 (600 A)
---
OK
OTG-L156 (1,000 A)
---
OK
OTG-CN52 (200 A)
---
OK
OTG-CN77 (400 A)
---
OK
OTG-CN112 (600 A)
---
OK
Note: 1. “OK” indicates groupings that can be combined freely.
2. Combinations with the OTG-LA@@ are also possible.
■ Options
Flush Mounting Adapters
Front Cover
Model
Model
Y92F-30
Y92A-48B (Hard Cover)
Y92F-71
Y92A-48D(Soft Cover)
Note: The Front Cover can be attached when the Y92F-30 Adapter is
used to mount the Ground Fault Relay to a panel.
Specifications
■ Ground Fault Relay Ratings
Item
Type
High-speed models
Delayed models
Control power supply
100/110 VAC or 200/220 VAC, 50/60 Hz (same for all)
Rated current
Depends on the ZCT
Sensed current
50% to 100% of the rated sensed current
Non-operating current
0% to 50% of the rated sensed current
Rated short-time current
2,500 A
Ground fault indication method
LED (red)
Test method
Relay operation confirmed using a test button. (Independent of ZCT connection.)
Reset method
Manual
Either press the reset button or turn the control power supply OFF and ON again.
Built-in
contacts
Contact form
SPDT+SPST-NO
Carrying current
5A
Rated load
cosφ = 1
cosφ = 0.4 (L/R = 7 ms)
240 VAC
5A
2A
110 VDC
0.3 A
0.2 A
30 VDC
5A
3A
Power (VA) consumption
3 VA max.
Weight
Approx. 110 g
2
K6EL
■ Ground Fault Relay Characteristics
Item
Type
High-speed models
Delayed models
Operating time
Less than 0.1 s
0.3 s/0.8 s (switchable)
Inertial non-operating
time
---
0.1 s when set to 0.3 s
0.5 s when set to 0.8 s
Control power supply
range
80% to 110% of the control power supply voltage
Operating temperature −10 to 55 °C (with no icing)
range
Operating humidity
range
45% to 85% (with no condensation)
Insulation resistance
5 MΩ min. at 500 VDC (between charged parts and the mounting panel)
Dielectric strength
1,500 VAC, 50/60 Hz for 1 min (between charged parts and the mounting panel)
Lightning impulse
dielectric strength
1.2/50 μs, 7,000 V (between control power supply terminals)
Lightning impulse
operation failure
1.2/50 μs, 7,000 V (primary side of ZCT)
Vibration resistance
Destruction: 16.7 Hz, 4-mm double amplitude for 1 min
Shock resistance
98 m/s2
Note: The range for an operating time of 0.3 s is 0.15 to 0.45 s and the range for an operating time of 0.8 s is 0.6 to 1.2 s.
■ ZCT (Zero-phase Current Transformer)
Item
Structure
Model
Indoor through-type models
OTG-L21
OTG-L30
OTG-L42
OTG-L68
Indoor separate-type models
OTG-L82
OTG-L156
OTG-CN52 OTG-CN77
OTGCN112
Rated current
50 A
100 A
200 A
400 A
600 A
1,000 A
200 A
400 A
600 A
Diameter of
through-hole
21 mm
30 mm
42 mm
68 mm
82 mm
156 mm
52 mm
77 mm
112 mm
Rated voltage
600 VAC max., 50/60 Hz, single-phase/three-phase
Output terminal
polarity
None (The ZCT’s output terminals k and l can be connected to either input terminals 3 or 4 of the Relay.) (See note.)
Insulation
resistance
100 MΩ min. (between charged metal parts and ground)
Dielectric strength
2,200 VAC, 50/60 Hz for 1 min (between charged metal parts and ground)
Ambient operating
temperature
−10 to 60 °C (with no icing)
Weight
Approx.
90 g
Approx.
130 g
Approx.
230 g
Approx.
480 g
Approx.
700 g
Approx.
6.6 kg
Approx.
1.3 kg
Approx.
2.5 kg
Approx.
3.5 kg
Note: Do not connect ZCT output terminals k and l to ground. Doing so may result in damage to the Relay.
3
K6EL
Internal Block Diagram
X/c
9
Delayed models only
8
Operating time
selection switch
11
X/a
Operating time
setting circuit
6
Reset button
3
From OTG
ZCT *
Input
protection
circuit
4
Operating
value setting
circuit
Sensitivity
selection switch
(not provided on
the K6EL-30)
Amplifier
circuit
7
Switching
circuit
X
Ground fault
indicator (red)
Test button
Power
supply
circuit
Shock-wave
absorption
circuit
2
1
Operation at
200/220 V
Operation at
100/110 V
10
Power supply indicator (green)
* Input from OTG does not have polarity.
Nomenclature
POWER LEAKED
K6EL-A100
Power supply indicator (green)
Ground fault indicator (red)
EARTH LEAKAGE
RELAY
TEST RESET
Reset button (black)
Test button (red)
SENSITIVITY
Sensitivity selection switch
(not provided on the K6EL-30)
100
mA
200
mA
Operating time selection switch
(delayed models only)
0.3S
0.8S
OPERATING TIME
Connections
Ground Fault Relay
(from Pin Side)
Ground Fault Relay with P3GA-11
(from Terminal Side)
5
5 6 7
From ZCT
4
3
2
1 11
8
9
10
4
From ZCT
3
2
100 VAC
200 VAC
From ZCT
6
7
8
9
1
11 10
100 VAC
Control power
supply
200 VAC
Ground Fault Relay with P2CF-11
(from Terminal Side)
8
7
6
9
10 11
1
5
4
From ZCT
3
From ZCT
2
100 VAC
200 VAC
Control power supply
4
K6EL
Connection Examples
Installation on the Electrical Path
Molded case
circuit-breaker
Installation on a Ground Bus Bar
Molded case
circuit-breaker
ZCT
Transformer
Load
Load
Transformer
kt
OTG ZCT
Y/b
lt
k
Y/b
OTG ZCT
Auxiliary relay
kt
l
Y
k
l
Auxiliary relay
lt
Y
ZCT
5 6 7
4
8
3
9
2
10
1 11
Alarm buzzer
BZ
Alarm buzzer
BZ
100/110 VAC
K6EL Ground
Fault Relay
Ground bus bar
K6EL
Ground
Fault Relay
5 6 7
4
8
3
9
2
10
1 11
200/220 VAC
Do not, under any circumstances, connect the k and l
lines to ground.
Note: When not using the kt and lt terminals (test terminals), leave
them unconnected. The Relay may not be able to attain its
performance characteristics if used with the kt and lt terminals
connected.
100/110 VAC
200/220 VAC
Dimensions
Note: All units are in millimeters unless otherwise indicated.
Ground Fault Relay
1
78
6
63.7
0.7
13.6
44.8 × 44.8
48
Applicable Connecting Sockets
P2CF-11 Front Connecting Socket
P3GA-11 Back Connecting Socket
PL11 Back Connecting Socket
48
5
K6EL
Dimensions with Adapter Mounted
Y92F-30 Flush Mounting Adapter
(Sold Separately)
Panel
15
Mounting Hole
Cutout Dimensions
P3GA-11
Back Connecting Socket
R0.5 max.
58
45 +0.5
0
45 +0.5
0
Note: Recommended panel
thickness: 1 to 3.2 mm.
48
7
91.4
Panel
Y92F-71 Flush Mounting Adapter
(Sold Separately)
56
Mounting Hole
Cutout Dimensions
P3GA-11
Back Connecting Socket
R0.5 max.
45±0.2
58
68
45 +0.5
0
55 +0.5
0
91.4
45±0.2
Note: Recommended panel
thickness: 1 to 3.2 mm.
50±0.2
Dimensions for Socket Mounting
Y92F-30
P3GA-11
K6EL
+
Adapter
K6EL
103
77
Y92H-1 Hook
K6EL
91.4
7
P2CF-11 (sold separately)
16
PL11
(sold separately)
(sold separately)
Note: The same dimensions apply
when using the Y92F-71 Adapter.
Connecting Sockets
P2CF-11 Front Connecting Socket
Eleven, M3.5×7.5
sems screws
3
4.5
7.8
Terminal Arrangement
(Top View)
Mounting Holes
Two, 4.5-dia. holes
8 7 6 5
4
70 max.
40±0.2
35.4
Two, 4.5-dia.
holes
9
3
10 11 1 2
4
50 max.
31.2 max.
P3GA-11 Back Connecting Socket
27 dia.
Terminal Arrangement
(Top View)
45
25.6
5 6 7 8
4
3
9
2 1 11 10
45
4.5 16.3 6.2
6
K6EL
PL11 Back Connecting Socket
4
3.5
1
Terminal Arrangement
(Bottom View)
Two, 3.5-dia. holes or
two, M3 socket mounting holes
5 6 7
30 dia.
51 max. 40
4
3
2
3.9
1 11
Two, 2-dia. holes
35 max.
Mounting Holes
8
9
10
31 dia.
holes
40±0.3
Approx. 20.5
Front Cover
Model
Y92A-48B (Hard Cover)
Y92A-48D (Soft Cover)
ZCT
9.3
Indoor Through-type Models
OTG-L21 (50 A)
M4 terminal screws
13.5
11
50
20
17
Mounting Hole
Cutout Dimensions
Terminal symbols
(protrude 0.3 mm)
kt
k
l
Nameplate
lt
Label and caution
68.5
6
Two, 5.5-dia. holes or
two, M5 screw holes
64
74
21 dia.
5.2
20
64
OTG-L30 (100 A)
9.3
M4 terminal screws
11
63
54
50
20
13.5
17
Mounting Hole
Cutout Dimensions
Terminal symbols
(protrude 0.3 mm)
kt
k
l
lt
Nameplate
Two, 5.5-dia. holes or
two, M5 screw holes
81.5
76
6
86
30 dia.
5.2 20
76
OTG-L42 (200 A)
11
9.3
5.2
Mounting Hole
Cutout Dimensions
17
88
42 dia.
Two, 5-dia. holes or
two, M4 screw holes
109
97
97
(mounting pitch)
107
OTG-L68 (400 A)
25
11
9.3
6.1
17
118
Mounting Hole
Cutout Dimensions
68 dia.
Two, 5-dia. holes or
two, M4 screw holes
136
131
13
(mounting pitch)
143
31
7
K6EL
11
OTG-L82 (600 A)
9.3
6.2
138
17
Mounting Hole
Cutout Dimensions
82 dia.
Two, 5-dia. holes or
two, M4 screw holes
158
160
28
160 (mounting pitch)
172
OTG-L156 (1,000 A)
33
156 dia.
L
M5 terminal screws
Mounting Hole
Cutout Dimensions
263
Four, 8.5-dia. holes or
four, M8 screw holes
138
90
230
270
3.2
60
230
9
90 130
20
40
Indoor Separate-type Models
OTG-CN52 (200 A)
52 dia.
K
M4 terminal screws
Mounting Hole
Cutout Dimensions
Two, 6.5-dia. holes or
two, M6 screw holes
141
K
79
170
170
30
7
200
8
K6EL
OTG-CN77 (400 A)
77 dia.
M4 terminal screws
K
Mounting Hole
Cutout Dimensions
157
Four, 6.5-dia. holes or
four, M6 screw holes
84
K
53
195
195
70 53
7
230
112 dia.
OTG-CN112 (600 A)
K
M4 terminal screws
Mounting Hole
Cutout Dimensions
Four, 6.5-dia. holes or
four, M6 screw holes
200
107
K
53
225
225
70 53
7
260
■ Maximum Wire Sizes for ZCTs
Wire/cable
Model
Rated
current
600-V vinyl-insulated wire (IV)
Through-hole
diameter
2-wire
Cable (VVR)
3-wire
2-wire
OTG-L21
50 A
21 dia.
22 mm2
14 mm2
OTG-L30
100 A
30 dia.
2
2
OTG-L42
200 A
42 dia.
100 mm
OTG-L68
400 A
68 dia.
400 mm2
325 mm2
325 mm2
OTG-L82
600 A
82 dia.
500 mm2
500 mm2
400 mm2
OTG-L156
1,000 A
156 dia.
500 mm
2
500 mm
2
OTG-CN52
200 A
52 dia.
200 mm
2
200 mm
2
OTG-CN77
400 A
77 dia.
500 mm
2
400 mm
2
OTG-CN112
600 A
112 dia.
500 mm2
60 mm
38 mm
2
100 mm
8 mm2
38 mm
2
500 mm2
3-wire
5.5 mm2
2
100 mm
38 mm2
2
1,000 mm
60 mm2
250 mm2
400 mm2
2
1,000 mm2
150 mm
2
100 mm2
400 mm
2
325 mm2
1,000 mm2
1,000 mm2
9
K6EL
Test Circuit
Switch
200 mA: 500 Ω, 50 W
500 mA: 200 Ω, 100 W
1,000 mA: 100 Ω, 200 W
100 VAC
Slidac
mA
Ammeter
K6EL
kt
k
l
lt
OTC
R
Select the resistance R shown in the test circuit diagram according to
the K6EL’s rated sensed current. Change the current using the slidac
and ascertain the K6EL’s operating value each time by reading the
ammeter.
For example, R could take the values shown below:
30 mA: 3.3 kΩ, 6 W
100 mA: 1 kΩ, 20 W
Safety Precautions
■ Correct Use
Switching the Operating Time
Installation and Wiring
• Do not, under any circumstances, connect the ZCT’s output terminals k and l to ground. Doing so may result in damage to the
Relay’s internal circuits.
• Pass the primary conductor through the ZCT once.
• The Relay detects ground faults in internal wiring of devices due to
insulation deterioration and so install the ZCT as close to the power
supply side as possible.
1. With the K6EL-A100, A200, and A500, the operating time can be
switched using a flat-bladed screwdriver.
2. The operating time for the K6EL-30, 100, 200, and 500 is fixed
and hence cannot be switched.
ZCT Installation
• Install the ZCT at an outdoor cable inlet or on a ground bus bar at a
location allowing easy inspection.
• When installing on the electrical path, use a ZCT with a value
greater than the electrical path’s rated current.
• If the secondary lines run in parallel to a circuit carrying a large current, either separate the lines as far as possible or use a shield line.
Run the secondary lines
close to each other.
Sensed current selection switch
Operating time selection switch
Testing
ZCT
K6EL
Primary conductor
Separate by 20 cm min.
Circuit carrying large current
• When installing a separate-type ZCT with current flowing along the
primary conductors, short the secondary terminals using clips or
some other method.
• If the ground fault indicator (red) lights when the Relay’s test button
is pressed, it means that the internal circuits are operating normally.
• To make an overall test, run a simulated ground fault current.
Resetting
• Once the relay models operate, it continues to operate until it is
reset. Reset it either by pressing the reset button (black) or by
turning the control power supply OFF and ON again.
Switching the Sensed Current
1. With the [email protected], 200, and 500 the sensed current can be
switched using a flat-bladed screwdriver.
2. The sensed current for the K6EL-30 is fixed and hence cannot be
switched.
10
K6EL
Q&A
Q: How does the K6EL operate when used for inverter loads (e.g., inverter motors and inverter air conditioners)?
A: High-frequency noise may cause unnecessary operation.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
In the interest of product improvement, specifications are subject to change without notice.
11
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you
have any questions or comments.
Warranties.
(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship
for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron
disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER
ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the
Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at
Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount
equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,
repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products
were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate
modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall
not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or
electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,
recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above
warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable
third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself
is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine,
system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product
with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence
thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate
it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our
practice to change part numbers when published ratings or features are changed, or when significant construction changes are
made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers
may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at
any time to confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2016.4
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2016 All Right Reserved.