OMRON Power Other Single-Phase Current Relay K8AK-AS K8AK-AS Catalog
Summary
The K8AK-AS is a robust single-phase current relay engineered for precise overcurrent and undercurrent monitoring in industrial facilities. This detailed manual serves as an essential guide for automation engineers and maintenance technicians, providing comprehensive product specifications across various models (K8AK-AS1/2/3). It covers critical setup procedures, input ranges adaptable to commercial Current Transformers (CTs), switchable normally open/closed outputs, and adjustable startup lock times. Use this resource to correctly select and install this protective device for reliable industrial equipment monitoring and system safety integration.
Page 1 Text Content
Single-phase Current Relay K8AK-AS Ideal for Current Monitoring for Industrial Facilities and Equipment. Monitor for overcurrents or 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. One SPDT output relay, 5 A at 250 VAC (resistive load). Output relay can be switched between normally open and normally closed. Output status can be monitored using LED indicator. Inputs are isolated from the power supply. Refer to Safety Precautions on page 9. Refer to page 8 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 m A AC/DC, 24 VAC/DC K8AK-AS1 24 VAC/DC 10 to 100 m A AC/DC,
100 to 240 VAC K8AK-AS1 100-240 VAC
50 to 500 m A AC/DC 0.1 to 1 A AC/DC, 24 VAC/DC K8AK-AS2 24 VAC/DC 0.5 to 5 A AC/DC,
100 to 240 VAC K8AK-AS2 100-240 VAC
0.8 to 8 A AC/DC
10 to 100 A AC*, 24 VAC/DC K8AK-AS3 24 VAC/DC
20 to 200 A AC* 100 to 240 VAC K8AK-AS3 100-240 VAC
*1 The K8AK-AS3 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*
Applicable CT current on secondary
Appearance Input range Model Appearance Applicable Relay
Relay side
10 to 100 A AC, 0 to 1 A AC,
K8AK-AS3 K8AC-CT200L K8AK-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 K8AK-AS2.
Page Summary Contents For OMRON Power Other Single-Phase Current Relay K8AK-AS K8AK-AS Catalog
Manual Details
| Brand | Current |
|---|---|
| Pages | 12 |
| File Size | 2.32 MB |
| Published | June 06, 2026 |
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Frequently Asked Questions
Is direct input possible with the K8AK-AS3 model for high current monitoring?
No, the K8AK-AS3 is designed to be used only in combination with an OMRON K8AC-CT200L Current Transformer (CT).
What are the options for resetting the unit after an overcurrent trip?
The relay supports both manual and automatic resetting, and this function can be switched between the two methods.
How do I determine if my wiring is appropriate for the terminals?
Use the provided ferrules guide to help determine suitability; remember that ferrules with insulating sleeves must be used with twisted wires.
What is the maximum current monitor range supported by the K8AK-AS2 model?
The K8AK-AS2 supports an operating value setting range of 0.8 to 8 A AC/DC when using commercially available CTs.