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Three-phase Voltage Relay
K8AB-PW
Ideal for monitoring 3-phase power supplies
for industrial facilities and equipment.
• Monitor overvoltages and undervoltages for three-phase 3-wire
or 4-wire power supplies.
Switch setting for 3-phase 3-wire or 3-phase 4-wire power
supply.
• Two SPDT output relays, 6 A at 250 VAC (resistive load).
Separate outputs possible for overvoltages and undervoltages.
• World-wide power specifications supported by one Unit
(switchable).
• 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
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
PW: Three-phase Voltage Relay (Simultaneous upper and lower monitoring)
3. Rated Input Voltage
1: 115, 127, 133, 138, 200, 220, 230, 240 VAC
2: 220, 230, 240, 277, 380, 400, 415, 480 VAC
Cat. No. N148-E1-01 Three-phase Voltage Relay K8AB-PW 1
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Ordering Information
■ List of Models
Three-phase Voltage Relay Rated input (See note 2.) Model
3-phase 3-wire mode 200, 220, 230, 240 VAC K8AB-PW1
3-phase 4-wire mode 115, 127, 133, 138 VAC
3-phase 3-wire mode 380, 400, 415, 480 VAC K8AB-PW2
3-phase 4-wire mode 220, 230, 240, 277 VAC
Note: 1. Three-phase 3-wire or 4-wire and the input range are switched using a switch.
2. The power supply is shared with the rated input voltage.
Ratings and Specifications
■ Ratings
Rated input
voltage
Operation
(overvoltage and
undervoltage)
Reset (HYS.) Hysteresis 5% of operating value (fixed)
Operating time (T) Overvoltage/
Power ON lock (LOCK) 1 s or 5 s (Value when input rapidly changes from 0% to 100%. The operating time is the shortest
Setting accuracy ±10% of full scale
Time error ±10% of set value (Minimum error: 50 ms)
Input frequency 45 to 65 Hz
Input impedance 100 kΩ min.
Indicators Power (PWR): Green LED, Relay output (RY): Yellow LED, Alarm outputs (ALM1/2): Red LED
Output relays Two SPDT relays (6 A at 250 VAC, resistive load)
K8AB-PW1 Three-phase, three-wire mode: 200, 220, 230, 240 VAC
K8AB-PW2 Three-phase, three-wire mode: 380, 400, 415, 480 VAC
Operating value setting
range
Operating value 100% operation at set value
Resetting method Automatic reset
undervoltage
Three-phase, four-wire mode: 115, 127, 133, 138 VAC
Three-phase, four-wire mode: 220, 230, 240, 277 VAC
Overvoltage = −30% to 25% of maximum rated input voltage
Undervoltage = −30% to 25% of maximum rated input voltage
Note: The rated input voltage is switched with a switch.
0.1 to 30 s (Value when input rapidly changes from 0% to 120%.)
at this point.)
Normally closed operation (normally ON) (separate outputs possible for overvoltages and
undervoltages)
2 Three-phase Voltage Relay K8AB-PW Cat. No. N148-E1-01
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■ Specifications
Ambient operating temperature −20 to 60°C (with no condensation or icing)
Storage temperature −40 to 70°C (with no condensation or icing)
Ambient operating humidity 25% to 85%
Storage humidity 25% to 85%
Altitude 2,000 m max.
Voltage fluctuation range 85% to 110% of rated input voltage
Input frequency 50/60 Hz ±5 Hz (AC power supply)
Output relays Resistive load 6 A at 250 VAC (cos φ = 1)
Inductive load 1 A at 250 VAC (cos φ = 0.4)
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 MΩ (at 500 V) between charged terminals and exposed uncharged parts
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) x 90 (H) x 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
6 A at 30 VDC (L/R = 0 ms)
1 A at 30 VDC (L/R = 7 ms)
1,500 VA
2
Two solid wires of 2.5 mm
tightened together
20 MΩ (at 500 V) between any charged terminals (i.e., between input, output, and power
supply terminals)
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),
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)
, two crimp terminals of 1.5 mm2 with insulation sleeves, can be
2 kV with ground (power line)
Cat. No. N148-E1-01 Three-phase Voltage Relay K8AB-PW 3
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Connections
■ Wiring Diagram
Overvoltage and Undervoltage Operation Diagram
Overvoltage
setting value
L1
Input
L2
Undervoltage setting value
Overvoltage alarm indicator
Undervoltage alarm indicator
Overvoltage relay
Undervoltage relay
L3
Flashing
T1: Power ON lock (1 s or 5 s)
T1
Flashing
T
Lit
T: Operating time (0.1 to 30 s)
T
Note: 1. The K8AB-PW output relay is normally operative.
2. The power ON lock prevents unnecessary alarms from
being generated during the instable period when the power
is first turned on. There is no relay output during timer
operation.
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Lit
T: Operating time (0.1 to 30 s)
Nomenclature
NL1L2L3
Load
Input
Output
Output
The power
supply is
shared with
the rated input voltage.
L1
L2
L3
14
Overvoltage
12
alarm
24
Undervoltage
22
alarm
N
11
21
■ Front
Power indicator
Relay status indicator
Alarm indicator
Overvoltage knob (OVER)
Undervoltage knob (UNDER)
Operating time knob (T)
Indicators
Item Meaning
Power indicator (PWR: Green) Lit when power is being
supplied.
Relay status indicator (RY: Yellow) Lit when relay is operating
(normally lit).
Alarm
indicator
(ALM: Red)
Overvoltage: Red The indicator flashes to indicate
the error status after the
overvoltage has exceeded the
threshold value while the
operating time is being clocked.
Undervoltage: Red The indicator flashes to indicate
the error status after the
undervoltage has exceeded the
threshold value while the
operating time is being clocked.
Setting Knobs
Item Usage
Overvoltage knob (OVER) Used to set the voltage to −30% to 25%
Undervoltage knob
(UNDER)
Operating time knob (T) Used to set the operating time to 0.1 to
of the rated input voltage.
Used to set the voltage to −30% to 25%
of the rated input voltage.
30 s.
4 Three-phase Voltage Relay K8AB-PW Cat. No. N148-E1-01
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■ Bottom
ON
SW1
SW2
SW3
SW4
DIP Switch
DIP Switch Functions
Function Default
SW1 Power ON lock time OFF 1 s OFF
ON 5 s
SW2 Monitoring mode
selector
SW3 SW4 Function Default
OFF OFF Rated input
ON OFF 220 VAC 127 VAC
OFF ON 230 VAC 133 VAC
voltage switch
(K8AB-PW1)
ON ON 240 VAC 138 VAC
OFF OFF Rated input
ON OFF 400 VAC 230 VAC
OFF ON 415 VAC 240 VAC
voltage switch
(K8AB-PW2)
ON ON 480 VAC 277 VAC
OFF 3-phase 3-wire
power monitoring
mode
ON 3-phase 4-wire
power monitoring
mode
3-phase
3-wire
mode
3-phase
4-wire
mode
SW3 SW4
200 VAC 115 VAC OFF OFF
380 VAC 220 VAC OFF OFF
OFF
Dimensions
K8AB-PW
22.5
100
5
90
5
Cat. No. N148-E1-01 Three-phase Voltage Relay K8AB-PW 5
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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.
■ 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.
6 Three-phase Voltage Relay K8AB-PW Cat. No. N148-E1-01
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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. N148-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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