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 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.
For the most recent information on models
Models added with transistor outputs for superior contact reliability.
that have been certified for safety
Refer to Safety Precautions on page 10.
standards, refer to your OMRON website.
Refer to page 9 for commonly asked questions.
Ordering Information
Single-phase Current Relay
Setting range Power supply voltage Output Model
Relay: SPDT contact output K8DT-AS1CD
24 VAC/DC
2 to 20 mA AC/DC,
Transistor K8DT-AS1TD
10 to 100 mA AC/DC,
Relay: SPDT contact output K8DT-AS1CA
50 to 500 mA AC/DC
100 to 240 VAC
Transistor K8DT-AS1TA
Relay: SPDT contact output K8DT-AS2CD
24 VAC/DC
Transistor K8DT-AS2TD
0.1 to 1 A AC/DC,
0.5 to 5 A AC/DC
Relay: SPDT contact output K8DT-AS2CA
100 to 240 VAC
Transistor K8DT-AS2TA
Relay: SPDT contact output K8DT-AS3CD
24 VAC/DC
Transistor K8DT-AS3TD
10 to 100 A AC *,
20 to 200 A AC *
Relay: SPDT contact output K8DT-AS3CA
100 to 240 VAC
Transistor K8DT-AS3TA
* 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 *
Applicable CT current on secondary
Appearance Input range Model Appearance Applicable Relay
Relay side
10 to 100 A AC, 0 to 1 A AC,
K8DT-AS3 K8AC-CT200L K8DT-AS2
20 to 200 A AC 0 to 5 A AC
* If you use a commercially available CT, do not exceed the overload
capacity of the K8DT-AS2.
Options (Order Separately)
Front Cover
Appearance Model
Y92A-D1A
1K8DT-AS
Ratings and Specifications
Input Range
Model Range *1 Connection terminal Setting range Input impedance Input type Overload capacity
20 mA AC/DC I1-COM 2 to 20 mA AC/DC Approx. 5 Direct input
K8DT-AS1@@ 100 mA AC/DC I2-COM 10 to 100 mA AC/DC Approx. 1 Direct input
Continuous input at
500 mA AC/DC I3-COM 50 to 500 mA AC/DC Approx. 0.2 Direct input
120% of maximum input.
Approx. 0.12
1 s at 150%
1 A AC/DC I1-COM 0.1 to 1 A AC/DC
Direct input or
(Load: 0.5 VA)
K8DT-AS2@@ commercially
Approx. 0.02
available CT
5 A AC/DC I2-COM 0.5 to 5 A AC/DC
(Load: 1.5 VA)
100 A AC I2-COM 10 to 100 A AC *2 --- OMRON CT Continuous input at 120% with an
OMRON CT (K8AC-CT200L).
K8DT-AS3@@ 30 s at 200%
200 A AC I3-COM 20 to 200 A AC *2 --- OMRON CT
1 s at 600%
* CT capacity on primary side.
*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.)
2