OMRON Power Other Single-Phase Current Relay K8DT-AS K8DT-AS Data Sheet
Summary
The single-phase current relay is a critical device designed to detect motor and equipment faults by accurately monitoring both AC/DC overcurrent and undercurrent conditions. This compact unit allows for customizable operating value, hysteresis, and timing settings while ensuring reliable industrial operation using standardized CTs. The technical guide provides essential information for electrical engineers and maintenance professionals, detailing model variations (relay or transistor outputs), comprehensive specifications, overload capacities, and required safety standards to ensure robust circuit protection designs.
Page 1 Text Content
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.
Models added with transistor outputs for superior contact reliability. For the most recent information on models 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 m A AC/DC, Transistor K8DT-AS1TD 10 to 100 m A AC/DC,
50 to 500 m A AC/DC Relay: SPDT contact output K8DT-AS1CA
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
Page Summary Contents For OMRON Power Other Single-Phase Current Relay K8DT-AS K8DT-AS Data Sheet
Manual Details
| Brand | Current |
|---|---|
| Pages | 16 |
| File Size | 3.40 MB |
| Published | June 06, 2026 |
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Frequently Asked Questions
How must I use the K8DT-AS3 unit properly?
The K8DT-AS3 is specifically designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). Direct input is not possible.
What types of outputs are available for this relay module?
It is available with both SPDT contact outputs (Relay) and transistor outputs, depending on the specific model chosen.
How can I manually reset the device if it trips?
To perform a manual reset, you must turn OFF the power supply for one second or longer.
What are some wiring improvements included with the unit?
Features include Push-In Plus Terminals to reduce wiring work, and double-insertion holes for crossover wiring on all terminals.