Omron K8AB-PH DATASHEET

Phase-sequence Phase-loss Relay

K8AB-PH

Ideal for phase sequence and phase loss
monitoring for industrial facilities and
equipment.

• Simultaneously monitor phase sequence and phase loss for
three-phase 3-wire power supplies.

• One SPDT output relay, 6 A at 250 VAC (resistive load).

• 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

■ Model Number Legend

2

solid or 2 × 1.5 mm2 standard ferrules.

K8AB-@@

123

1. Basic Model

K8AB: Measuring and Monitoring Relays

2. Functions

PH: Phase-sequence Phase-loss Relay

3. Rated Input Voltage

1: 200 to 500 VAC

Cat. No. N145-E1-01 Phase-sequence Phase-loss Relay K8AB-PH 1

Ordering Information

■ List of Models

Phase-sequence Phase-loss Relay Rated input voltage (See note.) Model

200 to 500 VAC K8AB-PH1

Note: The power supply is shared with the rated input voltage.

Ratings and Specifications

■ Ratings

Rated input voltage Non-isolated 200 to 500 VAC (15 VA)

Phase sequence, phase loss operating time 0.1 s max. (value when rated operating voltage changes quickly from 0% to 100%)

Resetting method Automatic reset

Input frequency 45 to 65 Hz

Input impedance 100 kΩ min.

Indicators Power (PWR): Green LED, Relay output (RY): Yellow LED

Output relays One SPDT relay (6 A at 250 VAC, resistive load)

(Relays are normally ON and turn OFF for phase sequence or loss phase errors.)

2 Phase-sequence Phase-loss Relay K8AB-PH Cat. No. N145-E1-01

■ 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. N145-E1-01 Phase-sequence Phase-loss Relay K8AB-PH 3

Connections

■ Wiring Diagram

Phase Sequence and Phase Loss Operation Diagram

Phase Loss Operation

L1

Input

L2

L3

Relay

Note: 1. Motor load phase loss cannot be detected. To detect motor

load phase loss, use the K8AB-PM or K8AB-PA.

2. The K8AB-PH output relay is normally operative.

Phase Sequence Operation

L1

L3

L1

L2

L2

L3

L3

L1

L2

Nomenclature

Load

L3L2L1

The power
supply is
shared with
the rated in­put voltage.

Input

L1

L2

L3

14

Output

11

Alarm

12

■ Front

Power indicator

Relay status indicator

Indicators

Item Meaning

Power indicator (PWR:
Green)

Relay status indicator (RY:
Ye l l o w )

Lit when power is being supplied.

Lit when relay is operating (normally lit).

4 Phase-sequence Phase-loss Relay K8AB-PH Cat. No. N145-E1-01

Dimensions

K8AB-PH

22.5

100

5

90

5

Cat. No. N145-E1-01 Phase-sequence Phase-loss Relay K8AB-PH 5

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 Phase-sequence Phase-loss Relay K8AB-PH Cat. No. N145-E1-01

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. N145-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: [phone]/Fax: [phone]