New Product
Single-phase Current Relay
K8AB-AS
Ideal for current monitoring for
industrial facilities and equipment.
Monitor for overcurrents or undercurrents.
Manual resetting and automatically resetting supported by one
Relay.
Startup lock and operating time can be set separately.
One SPDT output relay, 6 A at 250 VAC (resistive load).
Output relay can be switched between normally open and
normally closed.
Process control signal (4 to 20 mA) and commercial CT input
(0 to 1 A or 0 to 5 A) supported.
Output status can be monitored using LED indicator.
Inputs are isolated from the power supply.
Model Number Structure
Model Number Legend
K8AB-@@
123 4
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
AS: Single-phase Current Relay (One-sided operation)
3. Measuring Current
1: 2 to 20 mA AC/DC, 10 to 100 mA AC/DC, 50 to 500 mA AC/DC
2: 0.1 to 1 A AC/DC, 0.5 to 5 A AC/DC, 0.8 to 8 A AC/DC
3: 10 to 100 A AC, 20 to 200 A AC (See note.)
Note: The K8AB-AS3 is specially designed to be used in combination with the OMRON K8AC-CT200L Current Transformer (CT). (Direct input is
not possible.)
4. Supply Voltage
24 VAC/DC: 24 VAC/DC
100-115 VAC: 100 to 115 VAC
200-230 VAC: 200 to 230 VAC
Ordering Information
List of Models
Single-phase Current Relay Measuring current Supply voltage Model
24 VAC/DC K8AB-AS1 24 VAC/DC
2 to 20 mA AC/DC,
10 to 100 mA AC/DC, 100-115 VAC K8AB-AS1 100-115 VAC
50 to 500 mA AC/DC
200-230 VAC K8AB-AS1 200-230 VAC
24 VAC/DC K8AB-AS2 24 VAC/DC
0.1 to 1 A AC/DC,
0.5 to 5 A AC/DC, 100-115 VAC K8AB-AS2 100-115 VAC
0.8 to 8 A AC/DC
200-230 VAC K8AB-AS2 200-230 VAC
24 VAC/DC K8AB-AS3 24 VAC/DC
10 to 100 A AC,
20 to 200 A AC 100-115 VAC K8AB-AS3 100-115 VAC
(See note.)
200-230 VAC K8AB-AS3 200-230 VAC
Note: The K8AB-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not
possible.)
1K8AB-AS
Accessory (Order Separately)
OMRON CT
Current Transformer Input range Applicable Relay Model
10 to 100 A AC,
K8AB-AS3 K8AC-CT200L
20 to 200 A AC
Other CTs
CT current on secondary side Applicable Relay
0 to 1 A AC,
K8AB-AS2
0 to 5 A AC
Ratings and Specifications
Input Range
Model Range * Connection terminal Measuring current Input impedance Overload capacity
0 to 20 mA AC/DC I1-COM Approx. 5
2 to 20 mA AC/DC,
K8AB-AS1 0 to 100 mA AC/DC I2-COM 10 to 100 mA AC/DC, Approx. 1
50 to 500 mA AC/DC
0 to 500 mA AC/DC I3-COM Approx. 0.2
Continuous input :
Approx. 0.12
120% of maximum input
0 to 1 A AC/DC I1-COM
(Load : 0.5 VA)
1 s max. :
0.1 to 1 A AC/DC,
150% of maximum input
Approx. 0.02
K8AB-AS2 0 to 5 A AC/DC I2-COM 0.5 to 5 A AC/DC,
(Load : 1.5 VA)
0.8 to 8 A AC/DC
Approx. 0.02
0 to 8 A AC/DC I3-COM
(Load : 3 VA)
Continuous input :
0 to 100 A AC I2-COM Using OMRON CT
120% of maximum input
10 to 100 A AC,
30 s max. :
K8AB-AS3 20 to 200 A AC
200% of maximum input
0 to 200 A AC I3-COM Using OMRON CT
(See note.)
1 s max. :
600% of maximum input
Note: The K8AB-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not
possible.)
* The range is selected using connected terminals.
2