Omron K8DT-AS Seriesl User manual

1
New Product
Single-phase Current Relay
K8DT-AS
Detect errors in motors and other equipment
through current changes.
Use in either overcurrent or undercurrent mode.
• Monitor AC or DC currents with one Relay.
• Use with commercially available CTs (CT secondary side: 0 to 1 A or 0 to 5 A).
• Settings for the operating value, hysteresis, startup lock time, and operating time.
• Width of 17.5 mm to reduce space required in panels.
• Push-In Plus Technology that reduce wiring work.
Double-insertion holes for crossover wiring (all terminals).
• UL listed for easy shipping to North America.
• Models added with transistor outputs for superior contact reliability.
• RoHS compliant.
Ordering Information
Single-phase Current Relay
* The K8DT-AS3 @@ is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
OMRON CT Commercially Available CTs *
*If you use a commercially available CT, do not exceed the overload
capacity of the K8DT-AS2.
Options (Order Separately)
Front Cover
Refer to Safety Precautions on page 10.
Refer to page 9 for commonly asked questions.
For the most recent information on models
that have been certified for safety
standards, refer to your OMRON website.
Setting range Power supply voltage Output Model
2 to 20 mA AC/DC,
10 to 100 mA AC/DC,
50 to 500 mA AC/DC
24 VAC/DC
Relay: SPDT contact output K8DT-AS1CD
Transistor: Open collector K8DT-AS1TD
100 to 240 VAC
Relay: SPDT contact output K8DT-AS1CA
Transistor: Open collector K8DT-AS1TA
0.1 to 1 A AC/DC,
0.5 to 5 A AC/DC
24 VAC/DC
Relay: SPDT contact output K8DT-AS2CD
Transistor: Open collector K8DT-AS2TD
100 to 240 VAC
Relay: SPDT contact output K8DT-AS2CA
Transistor: Open collector K8DT-AS2TA
10 to 100 A AC *,
20 to 200 A AC *
24 VAC/DC
Relay: SPDT contact output K8DT-AS3CD
Transistor: Open collector K8DT-AS3TD
100 to 240 VAC
Relay: SPDT contact output K8DT-AS3CA
Transistor: Open collector K8DT-AS3TA
Appearance Input range Applicable
Relay Model
10 to 100 A AC,
20 to 200 A AC
K8DT-AS3 K8AC-CT200L
Appearance CT current on secondary
side Applicable Relay
0 to 1 A AC,
0 to 5 A AC K8DT-AS2
Appearance Model
Y92A-D1A

K8DT-AS
2
Ratings and Specifications
Input Range
*1. The range is selected using connected terminals.
*2. The K8DT-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
Model Range *1Connection terminal Setting range Input impedance Input type Overload capacity
K8DT-AS1@@
20 mA AC/DC I1-COM 2 to 20 mA AC/DC Approx. 5 Direct input
Continuous input at
120% of maximum input.
1 s at 150%
100 mA AC/DC I2-COM 10 to 100 mA AC/DC Approx. 1 Direct input
500 mA AC/DC I3-COM 50 to 500 mA AC/DC Approx. 0.2 Direct input
K8DT-AS2@@
1 A AC/DC I1-COM 0.1 to 1 A AC/DC Approx. 0.12 
(Load: 0.5 VA) Direct input or
commercially
available CT
5 A AC/DC I2-COM 0.5 to 5 A AC/DC Approx. 0.02 
(Load: 1.5 VA)
K8DT-AS3@@
100 A AC I2-COM 10 to 100 A AC *2 --- OMRON CT Continuous input at 120% with an
OMRON CT (K8AC-CT200L).
30 s at 200%
1 s at 600%
*CT capacity on primary side.
200 A AC I3-COM 20 to 200 A AC *2 --- OMRON CT

K8DT-AS
3
Ratings Specifications
Power supply voltage K8DT-AS@@D: 24 VAC 50/60 Hz, 24 VDC
K8DT-AS@@A: 100 to 240 VAC 50/60 Hz
Power consumption 24 VAC/DC: 1.8 VA/1 W max.
100 to 240 VAC: 2.5 VA max.
Rated insulation
voltage 600 VAC
Operating value
setting range (SV)
10% to 100% of the maximum value of the setting range
K8DT-AS1: 2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
K8DT-AS2: 0.1 to 1 A AC/DC (Compatible with
commercially available CTs.)
0.5 to 5 A AC/DC (Compatible with
commercially available CTs.)
K8DT-AS3: When used with the OMRON CT
(K8AC-CT200L).
10 to 100 A AC
20 to 200 A AC
Operating value 100% operation at set value
Reset value setting
range (HYS) 5% to 50% of operating value
Reset method
Manual reset/automatic reset (switchable)
Note: Manual reset: Turn OFF power supply for
1 s or longer.
Operating time
setting range (T) 0.1 to 30 s
Startup lock time
setting range (LOCK)
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.
LED Indicators Power (PWR): Green, Output (OUT): Yellow,
Alarm outputs (ALM): Red
Input impedance Refer to Input Range on page 2.
Output form
Relay: SPDT contact output
Transistor: Open collector
Switchable between normally open and normally
closed with a DIP switch setting.
Output relay ratings
Rated load: 250 VAC 5 A or 30 VDC 5 A
(resistive load),
250 VAC 1 A (inductive load),
48 VDC 0.2 A (inductive load)
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
3 A at 250 VAC or 30 VDC:100,000
operations
Transistor output
ratings
Contact form: SPST-NO (Open collector)
Rated voltage: 24 VDC (maximum voltage: 26.4 VDC)
Maximum current: 50 mA DC
Ambient operating
temperature 20 to 60°C (with no condensation or icing)
Storage temperature 25 to 65°C (with no condensation or icing)
Ambient operating
humidity 25% to 85% RH (with no condensation)
Storage humidity 25% to 85% RH (with no condensation)
Altitude 2,000 m max.
Applicable wires Stranded wires, solid wires, or ferrules
Applicable wire size 0.25 to 1.5 mm2(AWG24 to AWG16)
Wire insertion force 8 N max. for AWG20 wire
Screwdriver
insertion force 15 N max.
Wire stripping length 8 mm
Ferrule length 8 mm
Current capacity 10 A (per pole)
Number of insertions 50 times
Case color N1.5
Case material PC, UL 94 V-0
Weight Approx. 100 g
Mounting Mounts to DIN Track, or screw mounting
Dimensions 17.5 90 90 mm (WHD)
Allowable operating
voltage range 85% to 110% of power supply voltage
Allowable operating
frequency range 50/60 Hz 5 Hz
Input frequency range
K8DT-AS1 and K8DT-AS2:DC input or AC input
(45 to 65 Hz)
K8DT-AS3: AC input (45 to 65 Hz)
Overload capacity
K8DT-AS1 and K8DT-AS2:
Continuous input at 120% of
maximum input, 1 s at 150%
K8DT-AS3:Continuous input at 120%, 30 s at
200%, and 1 s at 600% with an
OMRON CT (K8AC-CT200L)
Note: Overload capacity of primary side of CT.
Repeat error
Operating
value
0.5% full scale (at 25C and 65% humidity, rated
power supply voltage)
Operating
time
50 ms (at 25C and 65% humidity, rated power
supply voltage)
Applicable
standards
Conforming
standards
EN 60947-5-1
Installation environment (pollution level 2,
Overvoltage category III)
EMC EN 60947-5-1
Safety
standards
UL 60947-5-1 (Listing), Korean Radio Waves Act
(Act 10564), CCC (GB14048.5)
Insulation resistance
20 M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
Dielectric strength
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
Impulse withstand
voltage
6 kV (between live terminals and exposed,
non-charged metal parts)
Noise immunity
Square-wave noise of 1-s/100-ns pulse width
with 1-ns rise time
100 to 240 VAC: 1,500 V power supply terminal
common/normal mode
24 VAC: 1,500 V power supply terminal common/
normal mode
24 VDC: 480 V power supply terminal common
Vibration resistance
Frequency 10 to 55 Hz, 0.35-mm single
amplitude, acceleration 50 m/s2
10 sweeps of 5 min each in X, Y, and Z directions
Shock resistance 100 m/s
2
, 3 times each in 6 directions along 3 axes
Degree of protection Terminals: IP20

K8DT-AS
4
Connections
Terminal Diagram
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. The K8DT-AS3 is designed to be used in combination with the OMRON K8AC-CT200L Current Transformer (CT).
Wiring Example
Directly Inputting a Current Using a CT
Transistor Output
Note: Use copper wires with a rating of 75°C or an equivalent rating.
Inside
Inside
(1) Current Input
AS1
(2) Output
C: Relay Output T: Transistor Output
(3) Power Supply Voltage
A: 100 to 240 VAC D: 24 VAC/DC
(No polarity)
500mA max.
20mA max.
100mA max.
AS2 AS3
CT
100A max.
200A max.
1A max.
5A max.
A1
I1
I3
14
A2
I2
11
12
C
CT
K8DT-AS1 C A
(1) (2) (3)
I1
I3
I2
C
I1
I3
I2
C
I1
I3
I2
C
14 11
12
A1 A2 A1 A2
14 11
DIP SW
DIP SW
Single-phase
power supply Load
Power supply
voltage A1
A2
Power
supply
AC/DC
A1
I1
I3
14
A2
I2
11
12
C
Single-phase
power supply Load
Power supply
voltage A1
A2
Power
supply
AC/DC
CT
DIP SW
A1
I1
I3
14
A2
I2
11
12
C
PLC
Single-phase
power supply Load
Power supply
voltage A1
A2
Power
supply
AC/DC
DIP SW
A1
I1
I3
14
A2
I2
11
C

K8DT-AS
5
Timing Charts
Overcurrent Operation Diagram
(Output Drive Method: Normally Open)
DIP switch setting: SW3 OFF, SW4 OFF
Undercurrent Operation Diagram
(Output Drive Method: Normally Closed)
DIP switch setting: SW3 ON, SW4 ON
Nomenclature
Front
Note: Use solid wires, stranded wires, or ferrules to connect to the
terminals.
To maintain the withstand voltage after connecting the
terminals, insert 8 mm of exposed conductor into the terminal.
Indicators
Setting Knobs
Hysteresis
(5% to 50% of operating value)
Lit
Flashing
tt: Operating time (0.1 to 30 s)
Delay time: 250 ms
(reference value)
LOCK: Startup lock time (0 to 30 s)
LOCK
Power supply
voltage
Contacts 11-14 or
transistor output
Contacts 11-12
Set value
Input
Alarm indicator
Hysteresis (5% to 50% of operating value)
Flashing
tt: Operating time (0.1 to 30 s)
Power supply
voltage
Contacts 11-12
Set value
Alarm indicator
Lit
Contacts 11-14 or
transistor output
Input
Delay time: 250 ms (reference value)
Terminal block
(See note.)
Terminal block
(See note.)
Current knob (SV)
Hysteresis knob (HYS)
Operating time knob (T)
Startup lock time knob
(LOCK)
Power indicator
Output status indicator
Alarm indicator
8 mm 8 mm
Solid Wire
8 mm
Stranded Wires Ferrules
Item Meaning
Power indicator
(PWR: Green) Lit when power is being supplied.
Output status indicator
(Output: Yellow) Lights for output
Alarm indicator
(ALM: Red)
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.
Item Usage
Current knob (SV) Used to set the current to 10% to 100% of
maximum setting range.
Hysteresis knob (HYS) Used to set the rest value to 5% to 50% of
the operating value.
Operating time knob (T) Used to set the operating time to 0.1 to 30 s.
Startup lock time knob
(LOCK) Used to set the startup lock time to 0 to 30 s.

K8DT-AS
6
Operation Methods
Setting Ranges and Wiring Connections
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.
For the K8DT-AS3, the I1 terminal is not used. For the K8DT-AS2, the I3 terminal is not used.
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
For a relay output, the SPDT contacts are output on terminals 11, 12, and 14. For a transistor output,
the NPN output is on terminals 11 and 14.
Do not use the transistor output for control applications. It is designed only to output a signal when
an error is detected.
DIP Switch Settings
The reset method, drive output method, and operating mode are set using the DIP switch located on
the front of the Unit.
For the K8DT-AS@, SW1 is not used.
Note: Open the DIP switch cover to set the DIP switch.
Keep the DIP switch cover closed while the power supply to the Relay is ON.
Model Setting range Input type Wiring
connections
K8DT-AS1
2 to 20 mA AC/DC Direct input I1-COM
10 to 100 mA AC/DC Direct input I2-COM
50 to 500 mA AC/DC Direct input I3-COM
K8DT-AS2
0.1 to 1 A AC/DC Direct input or
commercially available
CT
I1-COM
0.5 to 5 A AC/DC I2-COM
K8DT-AS3
10 to 100 A AC *OMRON CT I2-COM
20 to 200 A AC *OMRON CT I3-COM
Note: The DC input terminals have no polarity.
*The K8DT-AS3 is designed to be used in
combination with the OMRON K8AC-CT200L
Current Transformer (CT). (Direct input is not
possible.)
Single-phase power
K8DT-AS3
K8AC-
CT200L
Current input
or
C (COM)
A1
A2
I1
I2
I3
Load
Power supply
voltage
11
14
11
14
l
k
12
Contact output
Transistor output
<For K8DT-AS3>
O N
1 2 3 4
SW3 DIP switch pins
SW2
SW1
SW4
DIP Switch Functions
Note: All pins are set to OFF by default.
Pin
ON ❍
OFF ●
Resetting
method
Automatic reset
Not used.
❍--- ---
Manual reset ●--- ---
Output drive
method
Normally closed --- ❍---
Normally open --- ●---
Operating mode Undercurrent --- --- ❍
Overcurrent --- --- ●
1
ON
OFF
2 3 4

K8DT-AS
7
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: K8DT-AS3 Using Input Terminals I3-COM
The maximum setting range will be 200 A AC and the setting range will be 20 to 200 A.
Hysteresis
Hysteresis is set using the hysteresis knob (HYS)
The setting range is 5 to 50% of the operating value.
Example: Maximum of 200 A AC, Current Set Value (SV) of 50%, and Overcurrent Operation
Operation will be at 100 A and resetting at 90 A when the hysteresis (HYS) is set to 10%.
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.
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.
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.
Note: This function is valid only for overcurrent operation.
Errors are not detected
during this time.
Startup lock time
Startup lock timer start
30% of current
set value
Current set value
Inrush current

K8DT-AS
8
Dimensions (Unit: mm)
Optional Parts for DIN Track Mounting
17.5
90
86
90
5
100
Single-phase Current Relays
K8DT-AS1
K8DT-AS2
K8DT-AS3
1.8
76
4.1
10
10
5.9
5.2
20
57 30 dia.
14.514.5
6
8.5
50
33.5
34.5
81.5
13.5
86
54
63
11 4.7
Four M4 ×6 screws
17
20
9.3
1.7
1.7
9.3
76
Two M5 screw holes or
two 5.5-dia. holes
OMRON CT
K8AC-CT200L
Mounting Hole Dimensions
Note: The OMRON Current Transformer (CT) is designed
to be used with the K8DT-AS3. Use terminals k and l
for connections.
(Terminals kt and lt are not used.)
52.7
3.5
1.8
17.5 5.85
Options (Order Separately)
Front Cover
Y92A-D1A
DIN Tracks
PFP-100N
PFP-50N
*Dimensions in parentheses are for the PFP-50N.
4.5
15 25 25
10 10
1000(500) *
25 25 15(5) *
35±0.3
7.3±0.15
27±0.15
1

K8DT-AS
9
Checking Operation
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 setting and
check the operation using the same method as for
overcurrent.
How to Measure the Operating Time
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
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 K8DT-AS@has a built-in filter as a
countermeasure against high frequencies and cannot be
used to remove pulse current.
Can a motor with a rated current of 5 A be monitored
using the K8DT?
Are there any application precautions?
The K8DT-AS1 and K8DT-AS2 cannot be used with motor
loads. Use the K8DT-AS3 in combination with the K8AC-
CT200L 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.
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 K8DT-AS1 and
K8DT-AS2 and result in failure of the Relay.
To monitor the motor load, use the K8DT-AS3. (Overload
capacity: 120% of rating for continuous load, 200% of rating
for 30 s, and 600% of rating for 1 s).
The K8DT-AS3 has a large input range. Pass the conductors
multiple times through the special CT.
Concept behind Passing Conductor through the
CT When Using the K8DT-AS3
Example: Monitoring Overload of a Motor with a Rated Current of 5 A
K8DT 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 K8DT-AS3 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
K8DT 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 K8DT-AS3 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.
Questions and Answers
Q
Current input
Set value
Alarm indicator
Flashing
5s
Lit
Contact output or
transistor output
A1
Output
Input terminals
Power
supply
A2
±C
100 VAC
100 VAC
100 V
A
Cycle counter
0 to 10 A
30 Ω
400 W (two in parallel)
Variable autotransformer
Example: Operating Mode = Overcurrent, Output Drive Mode =
Normally Open, and Operating Time = 5 s
Connection Diagram
Q
Q
Q
Several seconds to
several tens of seconds
Time from beginning of startup
100%
500%
Motor current (percentage of rated value)
K8AC-CT200L
Primary-side conductor
To the K8DT-AS3

K8DT-AS
10
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
Meaning of Product Safety Symbols
!CAUTION
Doing so may occasionally result in minor injury due
to electric shock. Do not touch the Relay while the
power supply is ON, except for the adjustment knob.
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.
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.
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.
If the Relay is used with incorrect wiring, fire may
occasionally occur, possibly resulting in physical
damage. Check the wiring for mistakes before you
turn ON the power supply.
If the Relay fails, monitoring and alarm outputs may
fail to operate. This may result in physical damage to
the facilities, equipment, or other devices that are
connected to it. To reduce this risk, inspect the Relay
regularly. To maintain safety in the event of
malfunction of the Relay, take appropriate safety
measures, such as installing a monitoring device on a
separate line.
If the wire insertion length is insufficient, fire may
occasionally occur, possibly resulting in physical
damage. Insert the wires all the way to the back.
The terminal block may be damaged if you insert a
flat-blade screwdriver in the release hole with
excessive force. Insert the flat-blade screwdriver into
the release holes with a force of 15 N or less.
CAUTION
Indicates a potentially hazardous
situation which, if not avoided, may result
in minor or moderate injury or in property
damage.
Precautions for
Safe Use
Supplementary comments on what to do
or avoid doing, to use the product safely.
Precautions for
Correct Use
Supplementary comments on what to do
or avoid doing, to prevent failure to
operate, malfunction, or undesirable
effects on product performance.
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.

K8DT-AS
11
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 (sulfurizing gases,
ammonia gases, etc.)
•Locations subject to rapid temperature changes
•Locations prone to icing and dew condensation
•Locations subject to vibration and large shocks
•Locations subject to wind and rain
•Locations subject to static electricity or noise
•Locations subject to 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. Check terminal polarity and wire all terminals correctly. The power
supply terminals, however, do not have polarity.
4. Do not wire the input and output terminals incorrectly.
5. Make sure the power supply voltage and loads are within the
specifications and ratings for the product.
6. Make sure the ferrule terminals for wiring are of the specified size.
7. The stripping length is 8 mm. Insert the wires all the way to the
back.
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.
24.Do not wire anything to the release holes.
25.When you insert a flat-blade screwdriver into a release hole, do not
tilt or twist the screwdriver. The terminal block may be damaged.
26.Insert a flat-blade screwdriver into the release holes at an angle.
The terminal block may be damaged if the screwdriver is inserted
straight in.
27.Do not allow the flat-blade screwdriver to fall when you are holding
it in a release hole.
28.Do not bend a wire past its natural bending radius or pull in it with
excessive force. Doing so may break the wires.
29.Do not insert more than one wire into each terminal insertion hole.
30.To prevent wire materials from smoking or igniting, use the wiring
materials given in the following table.
Note: Please use Ferrules with UL certification (R/C).
31.Use only the specified wires for wiring.
32.When wiring the terminals, allow some leeway in the wire length.
33.Make sure that the power supply is turned OFF before you change
any DIP switch setting.
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. The distortion in the input waveform must be 30% max. If the input
waveform is distorted beyond this level, it may cause unnecessary
operation.
3. Error will be large if the product is used for thyristor or inverter
control.
4. When cleaning the product, do not use thinners or solvents. Use
commercial alcohol.
5. If you use stranded wires, make sure that there are no loose wire
strands.
6. If you wire crossovers and connect terminal blocks in parallel, a
large current will flow. Make sure that the current does not exceed
10 A.
7. The terminal block may be damaged if the recommended tool is
not used. Use the recommended flat-blade screwdriver to operate
the release holes.
Correct Mounting Direction, Mounting, and
Removing
Mounting to DIN Track
To mount the Relay to a DIN Track, hook the Relay onto the DIN
Track and press the Relay in the direction of the arrow until you hear
it lock into place.
Removing from the DIN Track
To remove the Relay, insert a screwdriver into the hook on the top or
bottom and pull out the hook to release the Relay.
• Leave at least 30 mm of space between the product and other
devices to allow easy installation and removal.
Precautions for Safe Use
Recommended wire
Stripping length
With Ferrules Without
Ferrules
0.25 to 1.5mm
2
/Equivalent to AWG24 to 16 10 mm 8 mm
Precautions for Correct Use
(1) (2)
PFP-100N (100 cm)
PFP-50N (50 cm)
Applicable DIN Tracks
30 mm min.

K8DT-AS
12
Screw Mounting
1. Pull out the two hooks on the back of the Relay to the outside until
you hear them click in place.
2. Insert M3 screws into the hook holes and secure the Relay.
Adjusting the Setting Knobs
• Use a flat-blade 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.
• To reduce the error in the setting knob, always turn the setting knob
from the minimum setting toward the maximum setting.
Connecting Wires to the Push-In Plus Terminal Block
Part Names of the Terminal Block
Connecting Wires with Ferrules and Solid Wires
Insert the solid wire or ferrule straight into the terminal block until the
end strikes the terminal block.
If a wire is difficult to connect because it is too thin, use a flat-blade
screwdriver in the same way as when connecting stranded wire.
Connecting Stranded Wires
Use the following procedure to connect the wires to the terminal block.
1. Hold a flat-blade screwdriver at an angle and insert it into the
release hole. The angle should be between 10° and 15°.
If the flat-blade screwdriver is inserted correctly, you will feel the
spring in the release hole respond.
2. With the flat-blade screwdriver still inserted into the release hole,
insert the wire into the terminal hole until it strikes the terminal block.
3. Remove the flat-blade screwdriver from the release hole.
Checking Connections
• After the insertion, pull gently on the wire to make sure that it will
not come off and the wire is securely fastened to the terminal block.
• To prevent short circuits, insert the stripped part of a stranded or
solid wire or the conductor part of a ferrule until it is hidden inside
the terminal insertion hole. (See the following diagram.)
Removing Wires from the Push-In Plus Terminal Block
Use the following procedure to remove wires from the terminal block.
The same method is used to remove stranded wires, solid wires, and
ferrules.
1. Hold a flat-blade screwdriver at an angle and insert it into the
release hole.
2. With the flat-blade screwdriver still inserted into the release hole,
remove the wire from the terminal insertion hole.
3. Remove the flat-blade screwdriver from the release hole.
(1)
(1)
(2)
(2)
Two M3 screw holes or
two 3-dia. holes
108
Mounting Hole Dimensions
Note: 1. Pull out the hooks to mount
the Relay with screws.
2. Recommended tightening
torque: 0.5 to 0.6 N·m.
Setting knob
Release hole
Terminal
(Insertion) hole Release hole
Terminal
(Insertion) hole
<Upper side> <Lower side>
Ferrule
Release hole
Terminal
(Insertion) hole
Ferrule
Release hole
Terminal
(Insertion) hole
<Upper side> <Lower side>
Wire
Flat-blade screwdriver
(1)
(3)
(2)
Wire
Flat-blade screwdriver
(1)
(2)
(3)
10 to 15°
10 to 15°
Flat-blade
screwdriver
Flat-blade
screwdriver
<Upper side> <Lower side>
Ferrule
Ferrule
<Upper side> <Lower side>
Wire
<Upper side>
Wire
<Lower side>
Wire
Flat-blade screwdriver
(1)
(3)
(2)
Wire
Flat-blade screwdriver
(1)
(2)
(3)
10 to 15°
10 to 15°
Flat-blade
screwdriver
Flat-blade
screwdriver
<Upper side> <Lower side>

K8DT-AS
13
Recommended Ferrules and Tools
Recommended ferrules
Note: 1. Make sure that the outer diameter of the wire coating is
smaller than the inner diameter of the insulation sleeve of
the recommended ferrule.
2. Make sure that the ferrule processing dimensions conform
to the following figures.
Recommended Flat-blade Screwdriver
Use a flat-blade screwdriver to connect and remove wires.
Use the flat-blade screwdriver.
The following table shows manufacturers and models as of 2015/Dec.
• Refer to the contents of this datasheet for cable selection and other
conditions for compliance with EMC standards.
Precaution on EN Standard Compliance
The K8DT complies with EN 60947-5-1 when it is built into a panel,
but observe the following handling methods to ensure compliance
with the requirements of this standard.
Wiring
Overvoltage category III
Pollution degree 2
• Open-frame Device
• If basic, double, or reinforced insulation is required, use the basic,
double, or reinforced insulation defined in IEC 60664 that is
suitable for the maximum applied voltage for the clearance, solid
insulation, and other factors.
• There is basic insulation between the power supply terminals and
input terminals.
• There is basic insulation between the power supply terminals and
output terminals.
• There is basic insulation between the input terminals and output
terminals.
• Operating section must have reinforced or double insulation.
• The sides of the case are not isolated.
• Connect the output contacts (contacts with different polarity) so
that they reach the same potential.
Wire
Ferrule
length
(mm)
Recommended ferrules
(mm
2
)(AWG)
Manufactured
by Phoenix
Contact
Manufactured
by
Weidmuller
Manufactured
by Wago
0.25 24 8 AI0.25-8 H0.25/12 FE-0.25-8N-YE
0.34 22 8 AI0.34-8 H0.34/12 FE-0.34-8N-TQ
0.5 20 8 AI0.5-8 H0.5/14 FE-0.5-8N-WH
0.75 18 8 AI0.75-8 H0.75/14 FE-0.75-8N-GY
1 18 8 AI1-8 H1.0/14 FE-1.0-8N-RD
1.5 16 8 AI1.5-8 H1.5/14 FE-1.5-8N-BK
Recommended crimp tool
CRIMPFOX6
CRIMPFOX6T-F
CRIMPFOX10S
PZ6 roto Variocrimp4
Model Manufacturer
XW4Z-00B Omron
ESD0.40X2.5 Wera
SZF 0.4X2.5 Phoenix Contact
0.4X2.5X75 302 Wiha
AEF.2.5X75 Facom
210-719 Wago*1
*1. Insulated types of Flat-blade Screw driver, strongly recommended to
prevent from an electric shock.
SDI 0.4X2.5X75 Weidmuller*1
98 20 25 KNIPEX*1
8 mm
2.1 mm max. 2.7 mm max.
Side
0.4 mm
2.5 mm dia.
2.5 mm
Front
EN/IEC Standard Compliance
Not isolated
Reinforced insulation
(Double insulation)

MEMO
14

Terms and Conditions Agreement
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any questions or comments.
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for a period of twelve months from the date of sale by Omron (or such other period expressed in writing
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NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE
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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
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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.
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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.

Authorized Distributor:
In the interest of product improvement,
specificationsare subject to change without notice.
Cat. No. N201-E1-01-X 0316(0316)
© OMRON Corporation 2016 All RightsReserved.
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