Omron K8AK-AW1, K8AK-AW, K8AK-AW2, K8AK-AW3 Series Manual

NEW Product

Single-phase Overcurrent/Undercurrent Relay

K8AK-AW

Ideal for Current Monitoring for
Industrial Facilities and Equipment.

• Monitor for overcurrents and undercurrents simultaneously.
Separate settings and outputs supported for overcurrents and
undercurrents.

• Use commercially available CTs (CT current on secondary
side: 0 to 1 A or 0 to 5 A).

• Manual resetting and automatically resetting supported by one
Relay.

• Startup lock and operating time can be set separately.

• Two sets of SPDT output contacts, 5 A at 250 VAC (resistive
load).

• Output status can be monitored using LED indicator.

• Inputs are isolated from the power supply.

Refer to Safety Precautions on page 11.
Refer to page 10 for commonly asked questions.

For the most recent information on models that have been certified for
safety standards, refer to your OMRON website.

Ordering Information

List of Models

Setting range Power 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

10 to 100 A AC*
20 to 200 A AC*

* The K8AK-AW3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)

Accessory (Order Separately)

●OMRON CT ●Commercially Available CTs*

Appearance Input range

24 VAC/DC K8AK-AW1 24 VAC/DC

100 to 240 VAC K8AK-AW1 100-240 VAC

24 VAC/DC K8AK-AW2 24 VAC/DC

100 to 240 VAC K8AK-AW2 100-240 VAC

24 VAC/DC K8AK-AW3 24 VAC/DC

100 to 240 VAC K8AK-AW3 100-240 VAC

10 to 100 A AC,
20 to 200 A AC

Applicable

Relay

K8AK-AW3 K8AC-CT200L

Model

Appearance CT current on secondary side

0 to 1 A AC,
0 to 5 A AC

* If you use a commercially available CT, do not exceed the overload

capacity of the K8AK-AW2.

Applicable

Relay

K8AK-AW2

1

K8AK-AW

Ratings and Specifications

Input Range

Model Range

0 to 20 mA AC/DC I1-COM

K8AK-AW1

K8AK-AW2

K8AK-AW3

*1 The range is selected using connected terminals.
*2 The K8AK-AW3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)

0 to 100 mA AC/DC I2-COM Approx. 1 Ω Direct input
0 to 500 mA AC/DC I3-COM Approx. 0.2 Ω Direct input

0 to 1 A AC/DC I1-COM

0 to 5 A AC/DC I2-COM

0 to 100 A AC I2-COM

0 to 200 A AC I3-COM --- OMRON CT

*1

Connection

terminals

Setting range Input impedance Input type Overload capacity

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

10 to 100 A AC
20 to 200 A AC

*2

*2

Approx. 5 Ω Direct input

Approx. 0.12 Ω
(Load: 0.5 VA)

Approx. 0.02 Ω
(Load: 1.5 VA)

--- OMRON CT

Direct input or
commercially
available CT

Continuous input at
120% of maximum input.
1 s at 150%

Continuous input at
120% with an OMRON
CT (K8AC-CT200L).
30 s at 200%
1 s at 600%
* CT capacity on primary

side.

2

Ratings

Power supply
voltage

Power consumption

Operating value setting range (SV)

Operating value

Reset value

Reset method

Operating time setting range (T)

Startup lock time setting range (LOCK)
Note: Enabled only for overcurrent

operation.

Indicators

Input impedance

Output relays

Output relay ratings

Ambient operating temperature

Storage temperature

Ambient operating humidity

Storage humidity

Altitude

Terminal screw tightening torque

Terminal wiring method

Case color

Case material

Weight

Mounting

Dimensions

Isolated power supply

K8AK-AW

24 VAC/DC
100 to 240 VAC

24 VAC/DC: 2.0 VA/1.1 W max.
100 to 240 VAC: 4.6 VA max.

10% to 100% of the maximum value of the setting range
K8AK-AW1: 2 to 20 mA AC/DC

K8AK-AW2: 0.1 to 1 A AC/DC (Compatible with commercially available CTs.)

K8AK-AW3: When used with the OMRON CT (K8AC-CT200L).

100% operation at set value

5% of operating value (fixed)

Manual reset/automatic reset (switchable)
Note: Manual reset: Turn OFF power supply for 1 s or longer.

0.1 to 30 s

0 to 30 s
(The startup lock timer starts when the input has reached approximately 30% or more of the set value.)
Note: Enabled only for overcurrent operation.

Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red

Refer to Input Range on previous page.

Two SPDT relay outputs (normally closed operation)

Rated load

Resistive load
5 A at 250 VAC

5 A at 30 VDC
Maximum switching capacity: 1,250 VA, 150 W
Minimum load: 5 VDC, 10 mA (reference values)
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations

−20 to 60°C (with no condensation or icing)

−25 to 65°C (with no condensation or icing)

25% to 85% (with no condensation)

25% to 85% (with no condensation)

2,000 m max.

0.49 to 0.59 N·m

Recommended wire

Solid wire: 2.5 mm
Twisted wires: AWG16, AWG18

Note: 1. Ferrules with insulating sleeves must be used with twisted wires.

Recommended ferrules

Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact
Al 1-8RD (for AWG18) manufactured by Phoenix Contact
Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact

N1.5

PC and ABS, UL 94 V-0

Approx. 150 g

Mounts to DIN Track.

22.5 × 90 × 100 mm (W×H×D)

10 to 100 mA AC/DC
50 to 500 mA AC/DC

0.5 to 5 A AC/DC (Compatible with commercially available CTs.)

10 to 100 A AC
20 to 200 A AC

3 A at 250 VAC/30 VDC: 100,000 operations

2

2. Two wires can be twisted together.

3

K8AK-AW

AW (I2 terminal)

0

10

60

50

40

30

20

51015

Distance between products d [mm]

I = 5 A

I = 3 A

I = 1 A

I = 0 A

Ambient temperature [°C]

K8AK

No.3

K8AK

No.2

K8AK

No.1

K8AK

No.4

K8AK

No.5

DIN Track Distance between products: d

Sample: K8AK-AW
Applied voltage: 240 VAC
Mounting distances: 0, 5, and 10 mm min.

Test method

●Relationship of Mounting Distance between
K8AK-AW Relays and Input Current
(Reference Values)

The following diagram shows the relationship between the mounting
distances and the input current.
If the relay is used with an input current that exceeds these values,
the temperature of the K8AK may rise and shorten the life of the
internal components.

Specifications

Allowable operating voltage range 85% to 110% of power supply voltage
Allowable operating frequency range 50/60 Hz ±5 Hz

Input frequency range

Overload capacity

Repeat accuracy

Applicable stan­dards

Insulation resistance

Dielectric strength

Noise immunity

Vibration resistance

Shock resistance 100 m/s2, 3 times each in 6 directions along 3 axes

Degree of protection Terminals: IP20

Operating value ±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, DC or 50/60 Hz sine wave input)
Operating time ±50 ms (at 25°C and 65% humidity, rated power supply voltage)

Conforming standards

EMC EN 60947-5-1

Safety standards

K8AK-AW1 and K8AK-AW2: DC input or AC input (45 to 65 Hz)
K8AK-AW3: AC input (45 to 65 Hz)

K8AK-AW1 and K8AK-AW2: Continuous input at 120% of maximum input, 1 s at 150%
K8AK-AW3: Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT (K8AC-CT200L).
Note: CT capacity on primary side.

EN 60947-5-1
Installation environment (pollution level 2, installation category III)

UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: C22.2 No.14,
CCC: GB14048.5

20 MΩ min.

Between external terminals and case
Between power supply terminals and input terminals
Between power supply terminals and output terminals
Between input terminals and output terminals

2,000 VAC for one minute

Between external terminals and case
Between power supply terminals and input terminals
Between power supply terminals and output terminals
Between input terminals and output terminals

1,500 V power supply terminal common/normal mode
Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time

Frequency: 10 to 55 Hz, 0.35-mm single amplitude
10 sweeps of 5 min each in X,Y, and Z directions

4

Connections

K8AK-AW1 100-240VAC

A B

Control Output

Relay output

250 VAC, 5 A (resistive load)
30 VDC, 5 A (resistive load)

A Current Input

AW1

Relay Output

Common

B Power Supply Voltage

100 to 240 VAC 24 VAC/DC

(No polarity)

A1 A2 I1

11 12 14

Relay Output

Common

100 mA max.

500 mA max.

20m A max.

AW2

5 A max.

1 A max.

AW3

100 A max.

CT

CT

200 A max.

21 24 22

C

I2 I3

A1

A2

A1

A2

C I2 I3 C I2 I3CI2I3

I1

I1 I1

21 24 22

11 12 14

21 22

CI2I3

11 12

Load

14

A1 A2

I1

A1

A2

24

Single-phase
power supply

Power
supply voltage

Power
supply
AC/DC

21 22

CI2I3

11 12

14

A1 A2

I1

A1

A2

CT

24

Single-phase
power supply

Load

Power
supply voltage

Power
supply
AC/DC

Terminal Diagram

K8AK-AW

Note: 1. Do not connect anything to terminals that are shaded in gray.

2. There is no polarity for the DC power supply input.

3. For the current input, you can input only from the C terminal and one other terminal.

4. Refer to Setting Ranges and Wiring Connections on the I1, I2, and I3 current input terminals.

5. Use the recommended ferrules if you use twisted wires.

6. The K8AK-AW3 is designed to be used in combination with the OMRON K8AC-CT200L Current Transformer (CT).

Wiring Example

Directly Inputting a Current Using a CT

5

K8AK-AW

Input

Note 1. The K8AK-AW@ output contacts are normally operative.
Note 2. The startup lock prevents unnecessary alarms from being generated during the

unstable period when the power is first turned ON. There is no contact output
during timer operation.

t

Flashing

Lit

Flashing

Lit

Hysteresis: Fixed at 5%

Hysteresis: Fixed at 5%

AL1 alarm indicator

AL2 alarm indicator

Overcurrent (AL1)

contacts (11-14)

Undercurrent (AL2)

contacts (21-24)

Overcurrent

set value (AL1)

Undercurrent

set value (AL2)

Power

supply voltage

t: Operating time (0.1 to 30 s)

LOCK
LOCK:
Startup lock time
(0 to 30 s)

t

t: Operating time (0.1 to 30 s)

Delay: 250 ms
(reference value)

Delay: 250 ms
(reference value)

Note 1. The K8AK-AW@ output contacts are normally operative.
Note 2. The startup lock prevents unnecessary alarms from being generated during the

unstable period when the power is first turned ON. There is no contact output during
timer operation.

Flashing

Lit

Flashing

Lit

Hysteresis: Fixed at 5%

Hysteresis: Fixed at 5%

AL1 alarm indicator

AL2 alarm indicator

Overcurrent (AL1)

contacts (11-14)

Overcurrent

set value (AL2)

Overcurrent (AL2)

contacts (21-24)

Overcurrent

set value (AL1)

Input

Power

supply voltage

LOCK:
Startup lock time
(0 to 30 s)

LOCK

t: Operating time (0.1 to 30 s)

t

t: Operating time (0.1 to 30 s)

t

Delay: 250 ms
(reference value)

Delay: 250 ms
(reference value)

Note 1. The K8AK-AW@ output contacts are normally operative.
Note 2. The startup lock prevents unnecessary alarms from being generated

during the unstable period when the power is first turned ON. There is no
contact output during timer operation.

Lit

Flashing

Lit

Hysteresis: Fixed at 5%

Hysteresis: Fixed at 5%

AL1 alarm indicator

AL2 alarm indicator

Undercurrent (AL1)

contacts (11-14)

Undercurrent

set value (AL2)

Input

Undercurrent (AL2)

contacts (21-24)

Undercurrent

set value (AL1)

Power

supply voltage

LOCK:
Startup lock time
(0 to 30 s)

LOCK

Flashing

t: Operating time (0.1 to 30 s)

t

t: Operating time (0.1 to 30 s)

t

Delay: 250 ms
(reference value)

Delay: 250 ms
(reference value)

Timing Charts

●Overcurrent and Undercurrent Operation
Diagram

DIP switch settings: SW3 ON and SW4 ON, or SW3 OFF and SW4
OFF

●Undercurrent and Undercurrent Operation
Diagram (Undercurrent Pre-alarm Mode)

DIP switch settings: SW3 OFF and SW4 ON.

●Overcurrent and Overcurrent Operation
Diagram (Overcurrent Pre-alarm Mode)

DIP switch settings: SW3 ON and SW4 OFF.

6

Nomenclature

Power indicator

Relay status indicator

Current knob (AL1)

Operating time knob (T)

Startup lock time knob
(LOCK)

Alarm indicator

Terminal block

(See notes 1 and 2.)

Terminal block

(See notes 1 and 2.)

Alarm indicator

Current knob (AL2)

For 2.5 mm2 or
smaller solid wires

For ferrules with
an insulation sleeve.

8 mm max. 8 mm max.

K8AK-AW

Front

●Indicators

Item Meaning

Power indicator
(PWR: Green)

Relay status indicator
(RY: Yellow)

Alarm indicator
(ALM: Red)

Lit when power is being supplied.

Lit when relay is operating.

Lit when there is an overcurrent or un­dercurrent.
The indicator flashes to indicate the er­ror status after the input has exceeded
the set value while the operating time is
being clocked.

●Setting Knobs

Item Usage

Current knob (AL1)

Current knob (AL2)

Operating time knob (T)

Startup lock time knob
(LOCK)

Note: 1. Use either a solid wire of 2.5 mm2 maximum or a ferrule with

insulating sleeve for the terminal connection.
The length of the exposed current-carrying part inserted into
the terminal must be 8 mm or less to maintain dielectric
strength after connection.

Used to set the current to 10% to 100%
of maximum setting range.

Used to set the current to 10% to 100%
of maximum setting range.

Used to set the operating time to 0.1 to
30 s.

Used to set the startup lock time to 0 to
30 s.

Recommended ferrules

Phoenix Contact

• Al 1,5-8BK (for AWG16)

• Al 1-8RD (for AWG18)

• Al 0,75-8GY (for AWG18)

2. Tightening torque: 0.49 to 0.59 N·m

7

K8AK-AW

Operation Methods

Setting Ranges and Wiring Connections

Model Setting range Input type

Wiring

connections

2 to 20 mA AC/DC Direct input I1-COM Note: The DC input terminals have no polarity.

K8AK-AW1

K8AK-AW2

K8AK-AW3

10 to 100 mA AC/DC Direct input I2-COM

50 to 500 mA AC/DC Direct input I3-COM

0.1 to 1 A AC/DC

Direct input or

I1-COM

commercially

0.5 to 5 A AC/DC I2-COM

available CT

10 to 100 A AC* OMRON CT I2-COM

20 to 200 A AC* OMRON CT I3-COM

* The K8AK-AW3 is designed to be used in combination

with the OMRON K8AC-CT200L Current Transformer
(CT). (Direct input is not possible.)

Connections

●Input

Connect the input between the I1-COM, I2-COM, or I3-COM terminals, according to the input
current. Malfunctions may occur if the input is connected to unused terminals and the Unit will
not operate correctly.
Terminal I1 is not used by the K8AK-AW3.
If using the OMRON K8AC-CT200L CT, connect to terminals k and l on the K8AC-CT200L.
(Terminals kt and lt are not used.)

●Power Supply

Connect the power supply to terminals A1 and A2.

●Outputs

AL1 (SPDT relay) is output to terminals 11, 12, and 14.
AL2 (SPDT relay) is output to terminals 21, 22, and 24.

Note: Use the recommended ferrules if using twisted wires.

DIP Switch Settings

The resetting method, relay drive method, and operating mode are set using the DIP switch
located on the bottom of the Unit.
K8AK-AW@ does not use SW1.

●DIP Switch Functions

<For K8AK-AW3>

Single-phase power

K8AC­CT200L

k

l

Load

Power supply

voltage

Current input

Signal output

Signal output

14

12

24

22

K8AK-AW3

A1

A2

I1

I2

I3

C (COM)

AL1 relay
signal
output

AL2 relay
signal
output

11

21

OFF

ON

SW4
SW3
SW2
SW1

DIP switch pins

Pin

Resetting
method

Operating
mode

OFF ● ↑

ON ❍ ↓

Manual reset

Automatic reset ❍ --- ---

AL1 AL2

Overcurrent Undercurrent --- ●●

Overcurrent Overcurrent --- ❍●

Undercurrent Undercurrent --- ●❍

1

OFF

ON

Not used.

2 3 4

● --- ---

Overcurrent Undercurrent --- ❍❍

Note: All pins are set to OFF at the factory.

Setting Method

●Setting Current

The current knob (SV) is used to set the current.
The current can be set to 10% to 100% of the maximum setting range.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the current.
The maximum setting range will differ depending on the model and the input terminal.
Example: K8AK-AW3 Using Input Terminals I3-COM
The maximum measuring current will be 200 A AC and the setting range will be 20 to 200 A.

8

K8AK-AW

●Operating Time

The operating time is set using the operating time knob (T).
The operating time can be set to between 0.1 and 30 s.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the operating time.
If the input current exceeds (drops lower than) the set value, the alarm indicator will start flashing for the set period and then stay lit.

●Startup Lock Time

The startup lock time is set using the startup lock time knob (LOCK).
The startup lock time can be set to between 0 and 30 s.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes
(when the set value and the input have reached the same level.)
Use this as a guide to set the startup lock time.
The startup lock time will start when the input current reaches 30% or more of the set value.
Use startup lock time to prevent unwanted operation, e.g., as a result of inrush current.

Current set value

30% of current set value

Startup lock timer start

Inrush current

Startup lock time

There are no outputs
during this period.

Dimensions (Unit: mm)

Single-phase Current Relays

K8AK-AW1
K8AK-AW2
K8AK-AW3

22.5

100

OMRON CT

K8AC-CT200L

90

72

9.3

9.3

1.7

10
10

1.8

4.1

1.7

4.7

11
63

54

50

57 30 dia.

86

76

Four M4 × 6 screws

8.5

34.5

33.5

6

14.514.5

5.2

20

5.9

20

17

13.5

81.5

Note:

The OMRON Current Transformer (CT) is
designed to be used with the K8AK-AW3.
Use terminals k and l for connections.
(Terminals kt and lt are not used.)

5

Mounting Hole Dimensions

Two M5 screw holes or
two 5.5-dia. holes

76

Optional Parts for DIN Track Mounting

●DIN Tracks

PFP-100N
PFP-50N

4.5

15 25 25

10

1,000 (500)*

±0.15

7.3

±0.3

35

25 25

10

*Dimensions in parentheses are for the PFP-50N.

15 (5)*

27

1

±0.15

9

K8AK-AW

r

Questions and Answers

Checking Operation

Q

Overcurrents
Gradually increase the input from 80% of the set value.
The input will equal the operating value when the input
exceeds the set value and the alarm indicator starts flashing.
Operation can be checked by the relay outputs that will start
after the operating time has passed.
Undercurrent
Gradually decrease the input from 120% of the set value and
check the operation using the same method as for

overcurrent.
Example: Overcurrent Operating Mode, Normally Closed Relay Drive,
and an Operating Time of 5 s.

Set value

Current input

Alarm indicator

Relay output

Connection Diagram

100 VAC

Variable autotransformer

100 VAC

400 W (two in parallel)

30 Ω

A

0 to 10 A

Flashing

5 s

Input terminals

Powe r
supply

Lit

Output

A1

A2

Can a motor with a rated current of 5 A be

Q

monitored using the K8AK?
Are there any application precautions?

The K8AK-AW1 and K8AK-AW2 cannot be used with motor
loads. Use the K8AK-AW3 in combination with the K8AC­CT200L Current Transformer (CT). With motor loads, the
startup current and stall current will cause a current of many
times the rated current to flow. Refer to the following figure for
information on the motor startup current.

500%

100%

Several seconds to

Motor current (percentage of rated value)

several tens of seconds

Time from beginning of startup

For a motor with a rating of 5 A, the startup current will be
approximately 30 A. The startup current will exceed the
overload capacity (rating: 150% for 1 s) of the K8AK-AW1 and
K8AK-AW2 and result in failure of the Relay.
To monitor the motor load, use the K8AK-AW3. (Overload
capacity: 120% of rating for continuous load, 200% of rating for
30 s, and 600% of rating for 1 s).
The K8AK-AW3 has a large input range. Pass the conductors
multiple times through the special CT.

±

C 100 V

Cycle counter

How to Measure the Operating Time

Q

Overcurrent

Change the input suddenly from 0% to 120% of the set value

and measure the time until the Unit operates.

Undercurrent

Change the input suddenly from 120% to 0% of the set value

and measure the time until the Unit operates.

Monitoring Switch-mode Power Supplies

Q

Switch-mode Power Supplies cannot be monitored. In circuits

with a capacitor input, including switch-mode power supplies,

the input capacitor recharge current flows in pulse form as the

load current. The K8AK-AW@ has a built-in filter as a

countermeasure against high frequencies and cannot be

used to remove pulse current.

Primary-side conducto

To the K8AK-AW3

K8AC-CT200L

Concept behind Passing Conductor through the CT When
Using the K8AK-AW3

Example: Monitoring Overload of a Motor with a Rated Current of 5 A

K8AK set value:
Overcurrent detection, operating value setting: 25%, operating time: 0.1 s
Startup lock timer: 0.1 to 30 s (Set the timer according to the duration of the
startup current.)

The setting range for the K8AK-AW3 is 10% to 100% of the rated
current (i.e., 10 to 100 A). Pass the conductors through the CT five
times so that at least 10 A of current flows. The input current to the
K8AK will be 25 A (i.e., 5 A x 5 loops).
If a startup current of six times the rated current is generated, it will be
150 A (i.e., 25 A x 6). The overload capacity for the K8AK-AW3 is
200% of the rating for 30 s. The Relay will not fail even if the startup
current continues for 30 s, and it is possible to perform overload
detection.

10

K8AK-AW

Safety Precautions

Be sure to read the precautions for all models in the website at the following URL: http://www.ia.omron.com/.

Warning Indications

CAUTION

CAUTION

Precautions for Safe

Use

Precautions for

Correct Use

Indicates a potentially hazardous situation
which, if not avoided, may result in minor or
moderate injury or in property damage.

Supplementary comments on what to do or
avoid doing, to use the product safely.

Supplementary comments on what to do or
avoid doing, to prevent failure to operate,
malfunction, or undesirable effects on
product performance.

Electrical shock may cause minor injury.
Do not touch terminals while electricity is being supplied.

There is a risk of minor electrical shock, fire, or device failure.
Do not allow any pieces of metal, conductors, or cutting chips
that occur during the installation process to enter the product.

Meaning of Product Safety Symbols

Used to warn of the risk of electric shock under
specific conditions.

Used for general prohibitions for which there is no
specific symbol.

Used to indicate prohibition when there is a risk of
minor injury from electrical shock or other source if
the product is disassembled.

Used for general mandatory action precautions for
which there is no specified symbol.

Explosions may cause minor injuries. Do not use the product
in locations with inflammable or explosive gases.

There is a risk of minor electrical shock, fire, or device failure.
Do not disassemble, modify, repair, or touch the inside of the
product.

Loose screws may cause fires. Tighten terminal screws to the
specified torque of 0.49 to 0.59 N·m.

Use of excessive torque may damage the terminal screws.
Tighten terminal screws to the specified torque of 0.49 to

0.59 N·m.

Use of the product beyond its life may result in contact welding
or burning. Make sure to consider the actual operating
conditions and use the product within its rated load and
electrical life count. The life of the output relay varies
significantly with the switching capacity and switching
conditions.

11

K8AK-AW

AB

PFP-100N (100 cm)
PFP-50N (50 cm)

Applicable DIN Tracks:

Setting knob

Precautions for Safe Use Precautions for Correct Use

1. Do not use or store the product in the following locations.

• Locations subject to water or oil

• Outdoor locations or under direct sunlight

• Locations subject to dust or corrosive gases (particularly

sulfurizing gases, ammonia, etc.)

• Locations subject to rapid temperature changes

• Locations prone to icing and dew condensation

• Locations subject to excessive vibration or shock

• Locations subject to wind and rain

• Locations subject to static electricity and noise

• Habitats of insects or small animals

2. Use and store the product in a location where the ambient

temperature and humidity are within the specified ranges. If
applicable, provide forced cooling.

3. Mount the product in the correct direction.

4. Check terminal polarity when wiring and wire all connections

correctly. The power supply terminals do not have polarity.

5. Do not wire the input and output terminals incorrectly.

6. Make sure the power supply voltage and loads are within the

specifications and ratings for the product.

7. Make sure the crimp terminals for wiring are of the specified size.

8. Do not connect anything to terminals that are not being used.

9. Use a power supply that will reach the rated voltage within 1

second after the power is turned ON.

10.Keep wiring separate from high voltages and power lines that

draw large currents.
Do not place product wiring in parallel with or in the same path as
high-voltage or high-current lines.

11.Do not install the product near equipment that generates high

frequencies or surges.

12.The product may cause incoming radio wave interference. Do not

use the product near radio wave receivers.

13.Install an external switch or circuit breaker and label it clearly so

that the operator can quickly turn OFF the power supply.

14.Make sure the indicators operate correctly. Depending on the

application environment, the indicators may deteriorate
prematurely and become difficult to see.

15.Do not use the product if it is accidentally dropped. The internal

components may be damaged.

16.Be sure you understand the contents of this catalog and handle

the product according to the instructions provided.

17.Do not install the product in any way that would place a load on it.

18.When discarding the product, properly dispose of it as industrial

waste.

19.When using the product, remember that the power supply

terminals carry a high voltage.

20.The product must be handled only by trained electrician.

21.Prior to operation, check the wiring before you supply power to

the product.

22.Do not install the product immediately next to heat sources.

23.Perform periodic maintenance.

Observe the following operating
methods to prevent failure and
malfunction.

1. Use the power supply voltage, input power, and other power

supplies and converters with suitable capacities and rated
outputs.

2. Use a precision screwdriver or similar tool to adjust the setting
knobs.

3. The distortion in the input waveform must be 30% max. If the
input waveform is distorted beyond this level, it may cause
unnecessary operation.

4. Error will be large if the product is used for thyristor or inverter
control.

5. To reduce the error in the setting knob, always turn the setting
knob from the minimum setting toward the maximum setting.

6. When cleaning the product, do not use thinners or solvents. Use
commercial alcohol.

Correct Mounting Direction, Mounting,
and Removing

• Mounting to DIN Track

1. Attach the product to the DIN Track with the tab at the top and
the hooks at the bottom.

2. Push the product onto the Track until the hooks lock into place.

• Removing from the DIN Track
Pull down on the bottom hook with a flat-blade screwdriver and lift
up on the product.

12

Adjusting the Setting Knobs

• Use a screwdriver to adjust the setting knobs. The knobs have a

stopper that prevents them from turning beyond the full right or left
position. Do not force a knob beyond these points.

MEMO

13

MEMO

14

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.

OMRON Corporation Industrial Automation Company

Tokyo, JAPAN

Contact: www.ia.omron.com

Regional Headquarters

OMRON EUROPE B.V.

Wegalaan 67-69-2132 JD Hoofddorp
The Netherlands
Tel: [phone]/Fax: [phone]

OMRON ASIA PACIFIC PTE. LTD.

No. 438A Alexandra Road # 05-05/08 (Lobby 2),
Alexandra Technopark,
Singapore 119967
Tel: [phone]/Fax: [phone]

OMRON ELECTRONICS LLC

One Commerce Drive Schaumburg,
IL 60173-5302 U.S.A.
Tel: [phone]/Fax: [phone]

OMRON (CHINA) CO., LTD.

Room 2211, Bank of China Tower,
200 Yin Cheng Zhong Road,
PuDong New Area, Shanghai, 200120, China CSM_4_2_0317
Tel: [phone]/Fax: [phone]

Authorized Distributor:

© OMRON Corporation 2014 All Rights Reserved.

In the interest of product improvement,
specifications are subject to change without notice.

Cat. No. N180-E1-01

0314 (0314)

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