Single-phase Current Relay
K8AB-AS
Ideal for current monitoring for industrial
heaters and motors.
• Monitor for overcurrents or undercurrents.
• Manual resetting and automatically resetting supported by one
Relay.
• Startup lock and operating time can be set separately.
• One SPDT output relay, 6 A at 250 VAC (resistive load).
• Switch the output relay between normally ON and normally OFF
operation.
• Process control signal (4 to 20 mA) and commercial CT input (0
to 1 A or 0 to 5 A) supported.
• Relay warning status easily monitoring using LED indicator.
• Easy wiring with ferrules
2 × 2.5 mm
• CE mark compliance certified by third party.
UL certification pending.
Model Number Structure
2
solid or 2 × 1.5 mm2 standard ferrules.
■ Model Number Legend
K8AB-@@
123 4
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
AS: Single-phase Current Relay (One-sided operation)
3. Measuring Current
1: 2 to 20 mA AC/DC, 10 to 100 mA AC/DC, 50 to 500 mA AC/DC
2: 0.1 to 1 A AC/DC, 0.5 to 5 A AC/DC, 0.8 to 8 A AC/DC
3: 10 to 100 A AC, 20 to 200 A AC (See note.)
Note: The K8AB-AS3 is specially designed to be used in combination with the OMRON K8AC-CT200L Current Transformer (CT). (Direct input is
not possible.)
4. Supply Voltage
24 VDC: 24 VDC
24 VA C : 24 VA C
100-115 VAC: 100 to 115 VAC
200-230 VAC: 200 to 230 VAC
Cat. No. N142-E1-01 Single-phase Current Relay K8AB-AS 1
Ordering Information
■ List of Models
Single-phase Current Relay Measuring current Supply voltage Model
2 to 20 mA AC/DC,
10 to 100 mA AC/DC,
50 to 500 mA AC/DC
0.1 to 1 A AC/DC,
0.5 to 5 A AC/DC,
0.8 to 8 A AC/DC
10 to 100 A AC,
20 to 200 A AC
(See note.)
Note: The K8AB-AS3 is designed to be used in combination with the OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not
possible.)
■ Accessory (Order Separately)
OMRON CT
Current Transformer Input range Applicable Relay Model
10 to 100 A AC,
20 to 200 A AC
24 VDC K8AB-AS1 24 VDC
24 VAC K8AB-AS1 24 VAC
100-115 VAC K8AB-AS1 100-115 VAC
200-230 VAC K8AB-AS1 200-230 VAC
24 VDC K8AB-AS2 24 VDC
24 VAC K8AB-AS2 24 VAC
100-115 VAC K8AB-AS2 100-115 VAC
200-230 VAC K8AB-AS2 200-230 VAC
24 VDC K8AB-AS3 24 VDC
24 VAC K8AB-AS3 24 VAC
100-115 VAC K8AB-AS3 100-115 VAC
200-230 VAC K8AB-AS3 200-230 VAC
K8AB-AS3 K8AC-CT200L
Other CTs
CT current on
secondary side
0 to 1 A AC,
0 to 5 A AC
Applicable Relay
K8AB-AS2
2 Single-phase Current Relay K8AB-AS Cat. No. N142-E1-01
Ratings and Specifications
■ Ratings
Operating power
Operate (SV) Operating value setting
Reset (HYS.) Hysteresis 5% to 50% of operating value
Operating time (T) 0.1 to 30 s (Value when input rapidly changes from 0% to 120%.)
Operating power ON lock (LOCK) 0 to 30 s (Value when input rapidly changes from 0% to 120%; lock timer starts when input
Setting accuracy ±10% of full scale
Time error ±10% of set value (Minimum error: 50 ms)
Input frequency K8AB-AS1/AS2 DC input, 45 to 65 Hz
Continuous
input
Input impedance 5
Indicators Power (PWR): Green LED, Relay output (RY): Yellow LED, Alarm outputs (ALM): Red LED
Output relays One SPDT relay (6 A at 250 VAC, resistive load)
Non-isolated power supply
Isolated power supply
range
Operating value 100% operation at set value
Resetting method Manual reset/automatic reset (switchable)
K8AB-AS3 45 to 65 Hz
K8AB-AS1/AS2 Continuous input: 115% of maximum input, 10 s max.: 125% of maximum input
K8AB-AS3 Continuous input: 240 A, 30 s max.: 400 A, 1 s max.: 1,200 A
24 VDC (1 W)
24 VAC (3 VA), 100 to 115 VAC (4 VA), 200 to 230 VAC (5 VA)
10% to 100% of maximum rated input value
Manual reset: Turn OFF operating power for 1 s or longer.
reaches approximately 30% of set value.)
Ω max.
■ Specifications
Ambient operating temperature −20 to 60°C (with no condensation or icing)
Storage temperature
Ambient operating humidity 25% to 85%
Storage humidity 25% to 85%
Altitude 2,000 m max.
Operating voltage range 85% to 110% of rated operating voltage
Rated power supply frequency 50/60 Hz ±5 Hz (AC power supply)
Output relays Resistive load 6 A at 250 VAC (cos
Inductive load 1 A at 250 VAC (cos
Minimum load 10 mA at 5 VDC
Maximum contact voltage 250 VAC
Maximum contact current 6 A AC
Maximum switching
capacity
Mechanical life 10,000,000 operations
Electrical life Make: 50,000 times, Break: 30,000 times
Terminal screw tightening torque 1.2 N·m
Crimp terminals
Insulation resistance 20 M
−40 to 70°C (with no condensation or icing)
6 A at 30 VDC (L/R = 0 ms)
1 A at 30 VDC (L/R = 7 ms)
1,500 VA
Two solid wires of 2.5 mm
tightened together
Ω (at 500 V) between charged terminals and exposed uncharged parts
20 M
Ω (at 500 V) between any charged terminals (i.e., between input, output, and power supply
terminals)
φ = 1)
φ = 0.4)
2
, two crimp terminals of 1.5 mm2 with insulation sleeves, can be
Cat. No. N142-E1-01 Single-phase Current Relay K8AB-AS 3
Degree of protection Terminal section: IP20, Rear case: IP40
Case color Munsell 5Y8/1 (ivory)
Case material ABS resin (self-extinguishing resin) UL94-V0
Weight 200 g
Mounting Mounted to DIN Track or via M4 screws
Dimensions 22.5 (W)
× 90 (H) × 100 (D) mm
Installation environment Overvoltage Category III, Pollution Degree 2
Application standards EN60255-5/-6
Safety standards EN60664-1
EMC EMI: EN61326 Industrial applications
Electromagnetic interference wave
CISPR11 Group 1, Class A: CISPR16-1/-2
Terminal interference wave voltage
CISPR11 Group 1, Class A: CISPR16-1/-2
EMS: EN61326 Industrial applications
Electrostatic discharge EN61000-4-2: 8 kV (in air)
Radiating radio-frequency electromagnetic field EN61000-4-3:
10 V/m 1 kHz sine wave amplitude modulation (80 MHz to 1 GHz)
Burst EN61000-4-4: 1 kV (I/O signal line), 2 kV (power line)
Surge EN61000-4-5: 1 kV with line (power line),
2 kV with ground (power line)
Conducted RF EN61000-4-6: 3 V (0.15 to 80 MHz)
Power frequency magnetic field immunity
EN61000-4-8: 30 A/m
Voltage dip/short interruptions
EN61000-4-11: 0.5 cycle, 0.180° each, polarity 100% (rated voltage)
Connections
■ Wiring Diagram
Overcurrent Operation Diagram
(Output: Normally Open)
Operating power
Operating value
Input
Alarm indicator
Relay
Lock: Startup lock time (0 to 30 s)
LOCK
Undercurrent Operation Diagram
(Output: Normally Closed)
Operating power
Input
Operating value
Alarm indicator
Relay
Flashing
T
Hysteresis
(5% to 50% of operating value)
Flashing
Lit
T: Operating time (0.1 to 30 s)
T
Hysteresis
(5% to 50% of operating value)
Lit
T: Operating time (0.1 to 30 s)
Measuring Ranges and Connections
Model Measuring range Connection
K8AB-AS1 2 to 20 mA AC/DC I1-COM
10 to 100 mA AC/DC I2-COM
50 to 500 mA AC/DC I3-COM
K8AB-AS2 0.1 to 1 A AC/DC I1-COM
0.5 to 5 A AC/DC I2-COM
0.8 to 8 A AC/DC I3-COM
K8AB-AS3 10 to 100 A AC/DC (See note.) I2-COM
20 to 200 A AC/DC (See note.) I3-COM
Note: The K8AB-AS3 is designed to be used in combination with the
OMRON K8AC-CT200L Current Transformer (CT). (Direct
input is not possible with this model.)
Single-phase power
External
CT
Operating
power
Input
Output
A1
A2
I1
I2
I3
COM
14 11
Alarm
12
Single-phase power
<or>
Operating
power
Input
Output
A1
A2
I1
I2
I3
COM
14 11
Alarm
Load
Load
4 Single-phase Current Relay K8AB-AS Cat. No. N142-E1-01
Nomenclature
)
■ Front
Current knob (SV)
Power indicator
Relay status indicator
Alarm indicator
Hysteresis knob (HYS.)
Operating time knob (T
Startup lock time knob
(LOCK)
■ Function Selection DIP Switch
ON
SW1
SW2
SW3
SW4
DIP Switch
Indicators
Item Meaning
Power indicator (PWR:
Green)
Relay status indicator (RY:
Yellow)
Alarm indicator (ALM: Red) Lit when there is an overcurrent or
Lit when power is being supplied.
Lit when relay is operating.
undercurrent.
The indicator flashes to indicate the
error status after the input has
exceeded the threshold value while the
operating time is being clocked.
Setting Knobs
Item Usage
Current knob (SV) Used to set the current to 10% to 100%
Hysteresis knob (HYS.) Used to set the rest value to 5% to 50%
Operating time knob (T) Used to set the operating time to 0.1 to
Startup lock time knob
(LOCK)
of maximum rated input current.
of the operating value.
30 s.
Used to set the startup lock time to 0 to
30 s.
DIP Switch Functions
Function Default
SW1 Not used. OFF Not used. OFF
ON
SW2 Resetting
method
SW3 Relay drive
method
SW4 Operating
mode
OFF Manual reset OFF
ON Automatic reset
OFF Normally open
(normally OFF)
ON Normally closed
(normally ON)
OFF Overcurrent
monitoring
ON Undercurrent
monitoring
OFF
OFF
Cat. No. N142-E1-01 Single-phase Current Relay K8AB-AS 5
Dimensions
K8AB-AS
OMRON CT
K8AC-CT200L
22.5
9.3
9.3
1.7
11
63
54
50
57 30 dia.
86
10
10
1.8
4.1
76
100
1.7
4.7
Four M4 × 6 screws
8.5
6
14.514.5
5.2
5.9
34.5
33.5
20
20
17
13.5
81.5
5
90
5
Mounting Hole Dimensions
Two M5 screw holes or
two 5.5-dia. holes
76
6 Single-phase Current Relay K8AB-AS Cat. No. N142-E1-01
Safety Precautions
■ Precautions for Safe Use
Make sure to follow the instructions below to ensure safety.
1. Do not use or keep this product in the following environments.
• Outdoors, or places subject to direct sunlight or wearing
weather.
• Places where dust, iron powder, or corrosive gases (in
particular, sulfuric or ammonia gas) exist.
• Places subject to static electricity or inductive noise.
• Places where water or oil come in contact with the product.
2. Make sure to install this product in the correct direction.
3. There is a remote risk of electric shock. Do not touch terminals
while electricity is being supplied.
4. Make sure to thoroughly understand all instructions in the
Instructions Manual before handling this product.
5. Make sure to confirm terminal makings and polarity for correct
wiring.
6. Tighten terminal screws firmly using the following torque.
Recommended torque: 0.54 N·m
7. Operating ambient temperature and humidity for this product
must be within the indicated rating when using this product.
8. There is a remote risk of explosion. Do not use this product where
flammable or explosive gas exists.
9. Make sure that no weight rests on the product after installation.
10.To enable an operator to turn off this product easily, install
switches or circuit breakers that conform to relevant requirements
of IEC60947-1 and IEC60947-3, and label them appropriately.
11.For DC input, use a SELV power-supply capable of overcurrent
protection. Specifically, a SELV power-supply has a double or
reinforced insulation for input and output, and output voltage of
30 Vr.m.s with 42.4 V at peak or DC60V maximum.
Recommended power-supply: Model S8VS-06024@ . (Omron
product)
■ Precautions for Correct Use
For Proper Use
1. Do not use the product in the following locations.
• Places subject to radiant heat from heat generating devices.
• Places subject to vibrations or physical shocks.
2. Make sure to use setting values appropriate for the controlled
object. Failure to do so can cause unintended operation, and may
result in accident or corruption of the product.
3. Do not use thinner or similar solvent for cleaning. Use commercial
alcohol.
4. When discarding, properly dispose of the product as industrial
waste.
5. Only use this product within a board whose structure allows no
possibility for fire to escape.
About Installation
1. When wiring, use only recommended crimp terminals.
2. Do not block areas around the product for proper dissipation of
heat. (If you do not secure space for heat dissipation, life cycle of
the product will be compromised.)
3. To avoid electrical shocks, make sure that power is not supplied to
the product while wiring.
4. To avoid electrical shocks, make sure that power is not supplied to
the product when performing DIP switch settings.
Noise Countermeasures
1. Do not install the product near devices generating strong high
frequency waves or surges.
2. When using a noise filter, check the voltage and current and
install it as close to the product as possible.
3. In order to prevent inductive noise, wire the lines connected to the
product separately from power lines carrying high voltages or
currents. Do not wire in parallel with or on the same cable as
power lines.
Other measures for reducing noise include running lines along
separate ducts and using shield lines.
To avoid faulty operations,
malfunctions, or failure, observe the
following operating instructions.
1. When turning on the power, make sure to realize rated voltage
within 1 second from the time of first supply of electricity.
2. Make sure to use power supply for operations, inputs, and
transformer with the appropriate capacity and rated burden.
3. Maintenance and handling of this product may only be performed
by qualified personnel.
4. Distortion ratio of input wave forms must be 30% or less. Use of
this product with circuits that have large distortion in wave forms
may result in unwanted operations.
5. Using this product for thyristor controls or inverters will result in
errors.
6. When setting the volume, adjust the control from the minimum
side to the maximum side.
Cat. No. N142-E1-01 Single-phase Current Relay K8AB-AS 7
Warranty and Application Considerations
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.
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other
period if specified) from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT,
MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES
THAT THE BUYER OR USER ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS
OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.
LIMITATIONS OF LIABILITY
OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS, OR
COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT,
WARRANTY, NEGLIGENCE, OR STRICT LIABILITY.
In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.
IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS 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 OR REPAIR.
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in
the customer's application or use of the products.
Take all necessary steps to determine the suitability of the product for the systems, machines, and equipment with which it will be used.
Know and observe all prohibitions of use applicable to this product.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING
THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCTS ARE
PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
Disclaimers
PERFORMANCE DATA
Performance data given in this catalog 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 users must correlate it to actual application requirements. Actual
performance is subject to the OMRON Warranty and Limitations of Liability.
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other reasons. Consult with your
OMRON representative at any time to confirm actual specifications of purchased product.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
Cat. No. N142-E1-01
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
Industrial Devices and Components Division H.Q.
Industrial Control Components Department
Shiokoji Horikawa, Shimogyo-ku,
Kyoto, 600-8530 Japan
Tel: (81)75-344-7119/Fax: (81)75-344-7149
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