Omron K8AB-AS, Manual

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Single-phase Current Relay
K8AB-AS
Cat. No. N142-E1-02
Ordering Information
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List of Models
Note: 1. Models with a 24-VDC power supply have a non-isolated power supply.
The inputs and power supply are connected internally, so a malfunction may occur due to an unwanted current path if the inputs and
power supply are connected to the same line.
If an unwanted current path exists, use a K8AB AC Power Supply or isolate with an external power supply.
2. The K8AB-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not
possible.)
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Accessory (Order Separately)
OMRON CT
Other CTs
Ratings and Specifications
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Input Range
Single-phase Current Relay Measuring current Supply voltage Model
2 to 20 mA AC/DC,
10 to 100 mA AC/DC,
50 to 500 mA AC/DC 24 VDC, not insulated K8AB-AS1 24 VDC (See note 1.)
24 VAC, insulated K8AB-AS1 24 VAC
100-115 VAC, insulated K8AB-AS1 100-115 VAC
200-230 VAC, insulated K8AB-AS1 200-230 VAC
0.1 to 1 A AC/DC,
0.5 to 5 A AC/DC,
0.8 to 8 A AC/DC 24 VDC, not insulated K8AB-AS2 24 VDC (See note 1.)
24 VAC, insulated K8AB-AS2 24 VAC
100-115 VAC, insulated K8AB-AS2 100-115 VAC
200-230 VAC, insulated K8AB-AS2 200-230 VAC
10 to 100 A AC,
20 to 200 A AC
(See note 2.) 24 VDC, not insulated K8AB-AS3 24 VDC (See note 1.)
24 VAC, insulated K8AB-AS3 24 VAC
100-115 VAC, insulated K8AB-AS3 100-115 VAC
200-230 VAC, insulated K8AB-AS3 200-230 VAC
Current Transformer Input range Applicable Relay Model
10 to 100 A AC,
20 to 200 A AC K8AB-AS3 K8AC-CT200L
CT current on secondary side Applicable Relay
0 to 1 A AC,
0 to 5 A AC K8AB-AS2
Model Range Connection terminal Input impedance Overload capacity
K8AB-AS1 2 to 20 mA AC/DC I1-COM Approx. 5
Ω
120% max. input continuous
150% max. input for 1 s
10 to 100 mA AC/DC I2-COM Approx. 1
Ω
50 to 500 mA AC/DC I3-COM Approx. 0.2
Ω
K8AB-AS2 0.1 to 1 A AC/DC I1-COM Approx. 0.12
Ω
(load: 0.5 VA)
0.5 to 5 A AC/DC I2-COM Approx. 0.02
Ω
(load: 1.5 VA)
0.8 to 8 A AC/DC I3-COM Approx. 0.02
Ω
(load: 3 VA)
K8AB-AS3 10 to 100 A AC I2-COM Uses commercial CT 120% max. input continuous
200% max. input for 30 s
600% max. input for 1 s
20 to 200 A AC I3-COM Uses commercial CT