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Single-phase Overcurrent/Undercurrent Relay
K8DT-AW
Detect errors in motors and other equipment
through current changes.
Monitor for overcurrents and undercurrents
simultaneously with one Relay.
• 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).
• Width of 17.5 mm to reduce space required in panels.
• Push-In Plus Terminal that reduce wiring work.
The use of cage clamps enables wiring with bare stranded wires.
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.
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.
Ordering Information
Single-phase Overcurrent/Undercurrent Relay
Setting range
Power supply voltage
24 VAC/DC
2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
100 to 240 VAC
24 VAC/DC
0.1 to 1 A AC/DC
0.5 to 5 A AC/DC
100 to 240 VAC
24 VAC/DC
10 to 100 A AC *
20 to 200 A AC *
100 to 240 VAC
Output
Model
Relay: SPDT contact output
K8DT-AW1CD
Transistor: NPN output
K8DT-AW1TD
Relay: SPDT contact output
K8DT-AW1CA
Transistor: NPN output
K8DT-AW1TA
Relay: SPDT contact output
K8DT-AW2CD
Transistor: NPN output
K8DT-AW2TD
Relay: SPDT contact output
K8DT-AW2CA
Transistor: NPN output
K8DT-AW2TA
Relay: SPDT contact output
K8DT-AW3CD
Transistor: NPN output
K8DT-AW3TD
Relay: SPDT contact output
K8DT-AW3CA
Transistor: NPN output
K8DT-AW3TA
* The K8DT-AW3@@ is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
Commercially Available CTs *
OMRON CT
Appearance
Input range
Applicable
Relay
10 to 100 A AC,
20 to 200 A AC
K8DT-AW3
Model
K8AC-CT200L
Appearance
CT current on
secondary side
Applicable Relay
0 to 1 A AC,
0 to 5 A AC
K8DT-AW2
* If you use a commercially available CT, do not exceed the overload
capacity of the K8DT-AW2.
Options (Order Separately)
Front Cover
Appearance
Model
Y92A-D1A
1
K8DT-AW
Ratings and Specifications
Input Range
Model
K8DT-AW1@@
Range *1
Connection
terminals
Setting range
20 mA AC/DC
I1-COM
2 to 20 mA AC/DC
Approx. 5 Ω
100 mA AC/DC
I2-COM
10 to 100 mA AC/DC
Approx. 1 Ω
500 mA AC/DC
I3-COM
50 to 500 mA AC/DC
Approx. 0.2 Ω
0.1 to 1 A AC/DC
Approx. 0.12 Ω
(Load: 0.5 VA)
Approx. 0.02 Ω
(Load: 1.5 VA)
1 A AC/DC
I1-COM
K8DT-AW2@@
K8DT-AW3@@
Input impedance
5 A AC/DC
I2-COM
0.5 to 5 A AC/DC
100 A AC
I2-COM
10 to 100 A AC *2
---
200 A AC
I3-COM
20 to 200 A AC *2
---
Input type
Overload capacity
Direct input
Direct input or
commercially
available CT
OMRON 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.
*1. The range is selected using connected terminals.
*2. The K8DT-AW3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
2
K8DT-AW
Ratings
Specifications
Power supply voltage
K8DT-AW@@D: 24 VAC 50/60Hz, 24 VDC
K8DT-AW@@A: 100 to 240 VAC 50/60Hz
Allowable operating
voltage range
85% to 110% of power supply voltage
Power consumption
24 VAC/24 VDC: 1.8 VA/1 W max.
100 to 240 VAC: 2.5 VA max.
Allowable operating
frequency range
50/60 Hz ±5 Hz
Rated insulation voltage
600 VAC
Input frequency range
K8DT-AW1 and K8DT-AW2: DC input or AC input
(45 to 65 Hz)
K8DT-AW3: AC input (45 to 65 Hz)
Operating value setting
range (AL1, AL2)
10% to 100% of the maximum value of the setting
range
K8DT-AW1: 2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
K8DT-AW2: 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-AW3: When used with the OMRON CT
(K8AC-CT200L).
10 to 100 A AC
20 to 200 A AC
Overload capacity
K8DT-AW1 and K8DT-AW2: Continuous input at
120% of maximum input, 1 s at 150%
K8DT-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.
Operating value
100% operation at set value
Reset value
5% of operating value (fixed)
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.
Indicators
Power (PWR): Green, Output (OUT): Yellow,
Alarm output 1 (ALM1): Red, Alarm output 2
(ALM2): Red
Input impedance
Refer to Input Range on page 2.
Output form
Relay: SPDT contact output
Transistor: NPN output
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 (NPN transistor)
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
Repeat
accuracy
Applicable
standards
Operating ±0.5% full scale (at 25°C and 65% humidity, rated
value
power supply voltage)
Operating ±50 ms (at 25°C and 65% humidity, rated power
time
supply voltage)
EN 60947-5-1
Conforming
Installation environment (pollution level 2,
standards
Overvoltage category III)
EMC
EN 60947-5-1
Safety
UL 60947-5-1 (Listing), Korean Radio Waves Act
standards (Act 10564), CCC (GB14048.5)
Insulation resistance
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
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, noncharged metal parts)
Noise immunity
Square-wave noise of 1-μs/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/s2, 3 times each in 6 directions along 3
axes
Degree of protection
Terminals: IP20
Screwdriver insertion force 15 N max.
Wire stripping length
8 mm
Ferrule length
8 mm
Recommended
flat-blade screwdriver
XW4Z-00B (Omron)
SZF 0.4 × 2.5 (Phoenix Contact)
210-719 (Wago)
SDI 0.4 × 2.5 × 75 (Weidmuller)
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)
3
K8DT-AW
Connections
Terminal Diagram
K8DT-AW1 C A
(1)
(3) Power Supply Voltage
(2)(3)
A: 100 to 240 VAC
(1) Current Input
AW2
AW1
AW3
A1
A2
I3
C
I1
I2
A1
D: 24 VAC/DC
A2
A1
A2
(No polarity)
100 mA max.
20 mA max.
5 A max.
100 A max.
CT
500 mA max.
1 A max.
200 A max.
CT
I3
C
I1
I2
C
I1
I3
I2
(2) Output
C
DIP SW
I2
12
14
C: Relay Output
T: Transistor Output
12
14
11
11
14
11
Inside
Inside
Note: 1.
2.
3.
4.
5.
Do not connect anything to terminals that are shaded in gray.
There is no polarity for the DC power supply input.
For the current input, you can input only from the C terminal and one other terminal.
Refer to Setting Ranges and Wiring Connections on the I1, I2, and I3 current input terminals.
The K8DT-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
Single-phase
power supply
Load
Single-phase
power supply
Load
CT
Power
A2
supply voltage A1
Power
A2
supply voltage A1
A1 A2
I3 C
I1 I2
A1 A2
I3 C
I1 I2
Power
supply
AC/DC
Power
supply
AC/DC
DIP SW
12
14 11
DIP SW
12
14 11
Transistor Output
Single-phase
power supply
Load
Power
A2
supply voltage A1
A1 A2
I3 C
I1 I2
Power
supply
AC/DC
DIP SW
14 11
PLC
Note: Use copper wires with a rating of 75°C or an equivalent rating.
4
K8DT-AW
Timing Charts
Overcurrent and Undercurrent Operation Diagram
Undercurrent and Undercurrent Operation Diagram
DIP switch settings: SW3 ON and SW4 ON, or
SW3 OFF and SW4 OFF
DIP switch settings: SW3 OFF and SW4 ON.
Power
supply voltage
Overcurrent
set value (AL1)
Undercurrent
set value (AL2)
Delay time: 250 ms
(reference value)
Hysteresis: Fixed at 5%
Power
supply voltage
Input
Undercurrent
set value (AL1)
Undercurrent
set value (AL2)
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Input
Flashing
AL1 alarm indicator
Flashing
AL2 alarm indicator
Contacts 11-14 or
transistor output
LOCK
t
Lit
Delay time: 250 ms
(reference value)
Lit
t: Operating time (0.1 to 30 s)
AL1 alarm indicator
Flashing
AL2 alarm indicator
Contacts 11-14 or
transistor output
Lit
Flashing
Delay time: 250 ms
(reference value)
Delay time: 250 ms
(reference value)
Lit
t
t: Operating time (0.1 to 30 s)
t
LOCK: Startup lock time (0 to 30 s)
t: Operating time (0.1 to 30 s)
t
LOCK: Startup lock time (0 to 30 s)
Note 1. The K8DT-AW@ outputs 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. This function is valid only for overcurrent operation.
LOCK
Note 1. The K8DT-AW@ outputs 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. This function is valid only for overcurrent operation.
Overcurrent and Overcurrent Operation Diagram
DIP switch settings: SW3 ON and SW4 OFF.
Power
supply voltage
Overcurrent
set value (AL1)
Overcurrent
set value (AL2)
Input
Hysteresis: Fixed at 5%
Flashing
AL1 alarm indicator
Delay time: 250 ms
(reference value)
Lit
Flashing
AL2 alarm indicator
Hysteresis: Fixed at 5%
Delay time: 250 ms
(reference value)
Lit
t
Contacts 11-14 or
transistor output
t: Operating time (0.1 to 30 s)
t
LOCK: Startup lock time (0 to 30 s)
LOCK
Note 1. The K8DT-AW@ outputs 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. This function is valid
only for overcurrent operation.
Nomenclature
Front
Indicators
Item
Terminal block
(See note.)
Power indicator
Current knob (AL1)
Lit when power is being supplied.
Output status indicator
(Output: Yellow)
Lights for output (lit for normal operation)
Alarm indicator
(ALM1, ALM2: 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.
Output status indicator
Current knob (AL2)
Alarm indicator
Operating time knob (T)
Startup lock time knob
(LOCK)
Meaning
Power indicator
(PWR: Green)
Setting Knobs
Item
Usage
Current knob (AL1)
Used to set the current to 10% to 100% of
maximum setting range.
Current knob (AL2)
Used to set the current to 10% to 100% of
maximum setting range.
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.
Terminal block
(See note.)
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.
Solid Wire
8 mm
Stranded Wires
8 mm
Ferrules
8 mm
5
K8DT-AW
Operation Methods
Setting Ranges and Wiring Connections
Input type
Wiring
connections
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
0.1 to 1 A AC/DC
Direct input or
commercially available
CT
I1-COM
0.5 to 5 A AC/DC
Direct input or
commercially available
CT
I2-COM
10 to 100 A AC *
OMRON CT
I2-COM
20 to 200 A AC *
OMRON CT
I3-COM
Model
Setting range
K8DT-AW1
K8DT-AW2
Note: The DC input terminals have no polarity.
* The K8DT-AW3 is designed to be used in
combination with the OMRON K8AC-CT200L
Current Transformer (CT). (Direct input is not
possible.)
K8DT-AW3
Connections
Input
<For K8DT-AW3>
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-AW3, the I1 terminal is not used. For the K8DT-AW2, 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.)
Single-phase power
K8DT-AW3
A1
Power supply
voltage
A2
K8ACCT200L
Power Supply
k
Connect the power supply to terminals A1 and A2.
Current input
I1
I2
I3
Outputs
C (COM)
l
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.
14
11
Contact output
12
Load
or
Transistor output
11
14
DIP Switch Settings
The reset method and operating mode are set using the DIP switch located on the front of the Unit.
K8DT-AW@ does not use SW1.
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.
DIP Switch Functions
ON ❍ ↑
3
4
Automatic reset
❍
---
---
Manual reset
●
---
---
---
❍
❍
---
●
❍
O
N
OFF ● ↓
4
3
2
1
Resetting
method
SW4
SW3
SW2
SW1
DIP switch pins
Operating
mode
1
2
Pin
ON
OFF
AL1
AL2
Overcurrent
Undercurrent
Undercurrent
Undercurrent
Overcurrent
Overcurrent
---
❍
●
Overcurrent
Undercurrent
---
●
●
Not used.
Note: All pins are set to OFF at the factory.
6
K8DT-AW
Setting Method
Setting Current
The current knobs (AL1, AL2) are 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-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.
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.
Inrush current
Current set value
30% of current set value
Startup lock time
Startup lock timer start
Errors are not detected
during this time.
7
K8DT-AW
Dimensions
(Unit: mm)
Single-phase Overcurrent/Undercurrent Relay
K8DT-AW1
K8DT-AW2
K8DT-AW3
100
90
86
17.5
5
90
OMRON CT
9.3
9.3
1.7
1.7
K8AC-CT200L
11
4.7
63
54
Four M4 × 6 screws
20
17
50
8.5
Mounting Hole Dimensions
13.5
Two M5 screw holes or
two 5.5-dia. holes
34.5
81.5
76
33.5
6
57
14.5
30 dia.
14.5
86
5.2
10
10
Note: The OMRON Current Transformer (CT) is designed
to be used with the K8DT-AW3. Use terminals k and l
for connections.
(Terminals kt and lt are not used.)
20
1.8
4.1
5.9
76
Options (Order Separately)
Front Cover
Y92A-D1A
1.8
52.7
3.5
17.5
5.85
Optional Parts for DIN Track Mounting
DIN Tracks
PFP-100N
PFP-50N
7.3±0.15
4.5
35±0.3
15
25
10
25
25
1000(500)*
10
25
15(5)*
27±0.15
1
* Dimensions in parentheses are for the PFP-50N.
8
K8DT-AW
Questions and Answers
Q
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 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
Flashing
Lit
Alarm indicator
5s
Contact output or
transistor output
Can a motor with a rated current of 5 A be monitored using the K8DT?
Are there any application precautions?
The K8DT-AW1 and K8DT-AW2 cannot be used with motor
loads. Use the K8DT-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.
Motor current (percentage of rated value)
Q
500%
100%
Several seconds to
several tens of seconds
Connection Diagram
Time from beginning of startup
A
100 VAC
0 to 10 A
30 Ω
400 W (two in parallel)
Output
Input terminals
Power
supply
Variable autotransformer
A1
A2
100 VAC
±
C 100V
Cycle counter
Q
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.
Q
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-AW1 and
K8DT-AW2 and result in failure of the Relay.
To monitor the motor load, use the K8DT-AW3. (Overload
capacity: 120% of rating for continuous load, 200% of rating
for 30 s, and 600% of rating for 1 s).
The K8DT-AW3 has a large input range. Pass the conductors
multiple times through the special CT.
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-AW@ has a built-in filter as a
countermeasure against high frequencies and cannot be
used to remove pulse current.
Primary-side conductor
To the K8DT-AW3
K8AC-CT200L
Concept behind Passing Conductor through the CT When
Using the K8DT-AW3
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-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
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-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.
9
K8DT-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
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.
!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.
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.
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.
10
K8DT-AW
Precautions for Safe Use
30.To prevent wire materials from smoking or igniting, use the wiring
materials given in the following table.
1. Do not use or store the product in the following locations.
• Locations subject to water, or oil
Stripping length
Recommended wire
Without
Ferrules
With Ferrules
• 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
0.25 to 1.5mm2/Equivalent to AWG24 to 16
10 mm
8 mm
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.
• Locations subject to wind and rain
Precautions for Correct Use
• 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 when wiring and wire all connections
correctly. The power supply terminals 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.
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.
(1)
(2)
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.
Applicable DIN Tracks
PFP-100N (100 cm)
PFP-50N (50 cm)
30 mm min.
• Leave at least 30 mm of space between the product and other
devices to allow easy installation and removal.
11
K8DT-AW
Screw Mounting
Connecting Stranded Wires
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.
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.
Mounting Hole Dimensions
(1)
Two M3 screw holes or
two 3-dia. holes
(2)
<Lower side>
<Upper side>
108
Flat-blade screwdriver
(2)
(1)
Note: 1. Pull out the hooks to mount
the Relay with screws.
2. Recommended tightening
torque: 0.5 to 0.6 N·m.
(2)
(3)
(1)
Wire
Wire
(2)
(3)
(1)
Flat-blade screwdriver
Adjusting the Setting Knobs
10 to 15°
• 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.
Flat-blade
screwdriver
Flat-blade
screwdriver
10 to 15°
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.)
Setting knob
<Upper side>
• To reduce the error in the setting knob, always turn the setting knob
from the minimum setting toward the maximum setting.
<Upper side>
<Lower side>
<Lower side>
Wire
Ferrule
Connecting Wires to the Push-In Plus Terminal Block
Part Names of the Terminal Block
Ferrule
<Lower side>
<Upper side>
Removing Wires from the Push-In Plus Terminal Block
Terminal
(Insertion) hole
Release hole
Release hole
Terminal
(Insertion) hole
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.
<Upper side>
Terminal
(Insertion) hole
Ferrule
Wire
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.
<Lower side>
<Upper side>
<Lower side>
Flat-blade screwdriver
(2)
Release hole
(3)
(1)
Wire
Release hole
Ferrule
Terminal
(Insertion) hole
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.
Wire
(2)
(3)
(1)
Flat-blade screwdriver
10 to 15°
Flat-blade
screwdriver
Flat-blade
screwdriver
10 to 15°
12
K8DT-AW
Recommended Ferrules and Tools
EN/IEC Standard Compliance
Recommended ferrules
Wire
(mm2)
(AWG)
0.25
Recommended ferrules
Ferrule
length
(mm)
24
Manufactured Manufactured
Manufactured
by Phoenix
by
by Wago
Contact
Weidmuller
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
PZ6 roto
Variocrimp4
CRIMPFOX6
CRIMPFOX6T-F
CRIMPFOX10S
Recommended crimp tool
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.
8 mm
2.1 mm max.
• 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.
2.7 mm max.
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.
Side
Front
Not isolated
2.5 mm dia.
0.4 mm
Reinforced insulation
(Double insulation)
2.5 mm
Model
XW4Z-00B
Manufacturer
Omron
ESD0.40✕2.5
Wera
SZF 0.4✕2.5
Phoenix Contact
0.4✕2.5✕75 302
Wiha
AEF.2.5✕75
Facom
210-719
Wago
SDI 0.4✕2.5✕75
Weidmuller
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.
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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
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
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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
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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
Authorized Distributor:
Kyoto, JAPAN
Contact: www.ia.omron.com
Regional Headquarters
OMRON EUROPE B.V.
Wegalaan 67-69, 2132 JD Hoofddorp
The Netherlands
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PuDong New Area, Shanghai, 200120, China
Tel: (86) 21-5037-2222/Fax: (86) 21-5037-2200
© OMRON Corporation 2016 All Rights Reserved.
In the interest of product improvement,
specifications are subject to change without notice.
CSM_1_1_0316
Cat. No. N202-E1-01
0316 (0316)
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