Omron K8AB-AS DATASHEET

Single-phase Current Relay

K8AB-AS

Ideal for current monitoring for industrial heaters and motors.

• 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).

• Switch the output relay between normally ON and normally OFF operation.

• Process control signal (4 to 20 mA) and commercial CT input (0 to 1 A or 0 to 5 A) supported.

• Relay warning status easily monitoring using LED indicator.

• Easy wiring with ferrules 2 × 2.5 mm

• CE mark compliance certified by third party. UL certification pending.

Model Number Structure

solid or 2 × 1.5 mm2 standard ferrules.

■ 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 VDC: 24 VDC 24 VA C : 24 VA C 100-115 VAC: 100 to 115 VAC 200-230 VAC: 200 to 230 VAC

Cat. No. N142-E1-01 Single-phase Current Relay K8AB-AS 1

Ordering Information

■ List of Models

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

0.1 to 1 A AC/DC,

0.5 to 5 A AC/DC,

0.8 to 8 A AC/DC

10 to 100 A AC, 20 to 200 A AC (See note.)

Note: The K8AB-AS3 is designed to be used in combination with the OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not

possible.)

■ Accessory (Order Separately)

OMRON CT

Current Transformer Input range Applicable Relay Model

10 to 100 A AC, 20 to 200 A AC

24 VDC K8AB-AS1 24 VDC

24 VAC K8AB-AS1 24 VAC

100-115 VAC K8AB-AS1 100-115 VAC

200-230 VAC K8AB-AS1 200-230 VAC

24 VDC K8AB-AS2 24 VDC

24 VAC K8AB-AS2 24 VAC

100-115 VAC K8AB-AS2 100-115 VAC

200-230 VAC K8AB-AS2 200-230 VAC

24 VDC K8AB-AS3 24 VDC

24 VAC K8AB-AS3 24 VAC

100-115 VAC K8AB-AS3 100-115 VAC

200-230 VAC K8AB-AS3 200-230 VAC

K8AB-AS3 K8AC-CT200L

Other CTs

CT current on

secondary side

0 to 1 A AC, 0 to 5 A AC

Applicable Relay

K8AB-AS2

2 Single-phase Current Relay K8AB-AS Cat. No. N142-E1-01

Ratings and Specifications

■ Ratings

Operating power

Operate (SV) Operating value setting

Reset (HYS.) Hysteresis 5% to 50% of operating value

Operating time (T) 0.1 to 30 s (Value when input rapidly changes from 0% to 120%.)

Operating power ON lock (LOCK) 0 to 30 s (Value when input rapidly changes from 0% to 120%; lock timer starts when input

Setting accuracy ±10% of full scale

Time error ±10% of set value (Minimum error: 50 ms)

Input frequency K8AB-AS1/AS2 DC input, 45 to 65 Hz

Continuous input

Input impedance 5

Indicators Power (PWR): Green LED, Relay output (RY): Yellow LED, Alarm outputs (ALM): Red LED

Output relays One SPDT relay (6 A at 250 VAC, resistive load)

Non-isolated power supply

Isolated power supply

range

Operating value 100% operation at set value

Resetting method Manual reset/automatic reset (switchable)

K8AB-AS3 45 to 65 Hz

K8AB-AS1/AS2 Continuous input: 115% of maximum input, 10 s max.: 125% of maximum input

K8AB-AS3 Continuous input: 240 A, 30 s max.: 400 A, 1 s max.: 1,200 A

24 VDC (1 W)

24 VAC (3 VA), 100 to 115 VAC (4 VA), 200 to 230 VAC (5 VA)

10% to 100% of maximum rated input value

Manual reset: Turn OFF operating power for 1 s or longer.

reaches approximately 30% of set value.)

Ω max.

■ Specifications

Ambient operating temperature −20 to 60°C (with no condensation or icing)

Storage temperature

Ambient operating humidity 25% to 85%

Storage humidity 25% to 85%

Altitude 2,000 m max.

Operating voltage range 85% to 110% of rated operating voltage

Rated power supply frequency 50/60 Hz ±5 Hz (AC power supply)

Output relays Resistive load 6 A at 250 VAC (cos

Inductive load 1 A at 250 VAC (cos

Minimum load 10 mA at 5 VDC

Maximum contact voltage 250 VAC

Maximum contact current 6 A AC

Maximum switching capacity

Mechanical life 10,000,000 operations

Electrical life Make: 50,000 times, Break: 30,000 times

Terminal screw tightening torque 1.2 N·m

Crimp terminals

Insulation resistance 20 M

−40 to 70°C (with no condensation or icing)

6 A at 30 VDC (L/R = 0 ms)

1 A at 30 VDC (L/R = 7 ms)

1,500 VA

Two solid wires of 2.5 mm tightened together

Ω (at 500 V) between charged terminals and exposed uncharged parts

20 M

Ω (at 500 V) between any charged terminals (i.e., between input, output, and power supply

terminals)

φ = 1)

φ = 0.4)

, two crimp terminals of 1.5 mm2 with insulation sleeves, can be

Cat. No. N142-E1-01 Single-phase Current Relay K8AB-AS 3

+ 5 hidden pages