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Single-phase Overcurrent/Undercurrent Relay

K8AK-AW

Ideal for Current Monitoring for 
Industrial Facilities and Equipment.

• Monitor for overcurrents and undercurrents simultaneously.

Separate settings and outputs supported for overcurrents and 
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.
• Two sets of SPDT output contacts, 5 A at 250 VAC (resistive 

load).

• Output status can be monitored using LED indicator.
• Inputs are isolated from the power supply.

Ordering Information

List of Models

* The K8AK-AW3 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*

* If you use a commercially available CT, do not exceed the overload 

capacity of the K8AK-AW2.

Refer to 

Safety Precautions

 on page 12.

Refer to page 11 for commonly asked questions.

For the most recent information on models that have been certified for 
safety standards, refer to your OMRON website.

Setting range

Power supply voltage

Model

2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC

24 VAC/DC

K8AK-AW1 24 VAC/DC

100 to 240 VAC

K8AK-AW1 100-240 VAC

0.1 to 1 A AC/DC
0.5 to 5 A AC/DC

24 VAC/DC

K8AK-AW2 24 VAC/DC

100 to 240 VAC

K8AK-AW2 100-240 VAC

10 to 100 A AC*
20 to 200 A AC*

24 VAC/DC

K8AK-AW3 24 VAC/DC

100 to 240 VAC

K8AK-AW3 100-240 VAC

Appearance

Input range

Applicable 

Relay

Model

10 to 100 A AC, 
20 to 200 A AC

K8AK-AW3

K8AC-CT200L

Appearance

CT current on secondary side

Applicable 

Relay

0 to 1 A AC,
0 to 5 A AC

K8AK-AW2

Содержание K8AK-AS1 24VAC/DC

Страница 1: ...ent Transformer CT Direct input is not possible Accessory Order Separately OMRON CT Commercially Available CTs If you use a commercially available CT do not exceed the overload capacity of the K8AK AW...

Страница 2: ...mA AC DC 50 to 500 mA AC DC Approx 5 Direct input Continuous input at 120 of maximum input 1 s at 150 0 to 100 mA AC DC I2 COM Approx 1 Direct input 0 to 500 mA AC DC I3 COM Approx 0 2 Direct input K...

Страница 3: ...puts ALM Red Input impedance Refer to Input Range on previous page Output relays Two SPDT relay outputs normally closed operation Output relay ratings Rated load Resistive load 5 A at 250 VAC 5 A at 3...

Страница 4: ...minals Between input terminals and output terminals Dielectric strength 2 000 VAC for one minute Between external terminals and case Between power supply terminals and input terminals Between power su...

Страница 5: ...h the OMRON K8AC CT200L Current Transformer CT Wiring Example Directly Inputting a Current Using a CT Always turn on the control power supply for the K8AK at least 2 seconds before turning on the powe...

Страница 6: ...AL1 Contact b for the approx 1 second interval immediately after the K8AK control power supply is turned on After that a switch to contact a will be made as an overcurrent state is no longer present A...

Страница 7: ...K8AK power supply voltage Power ON Undercurrent AL2 contacts 21 24 Undercurrent set value AL2 30 of AL1 current set value Overcurrent AL1 contacts 11 14 Lit AL2 alarm indicator AL1 alarm indicator Ove...

Страница 8: ...ng time 0 1 to 30 s t Operating time 0 1 to 30 s t t Delay 250 ms reference value Delay 250 ms reference value Delay 250 ms reference value Delay 250 ms reference value Flashing Flashing Power ON lock...

Страница 9: ...ched the same level Use this as a guide to set the current The maximum setting range will differ depending on the model and the input terminal Example K8AK AW3 Using Input Terminals I3 COM The maximum...

Страница 10: ...de to set the startup lock time The startup lock time will start when the input current reaches 30 or more of the set value Use startup lock time to prevent unwanted operation e g as a result of inrus...

Страница 11: ...figure for information on the motor startup current For a motor with a rating of 5 A the startup current will be approximately 30 A The startup current will exceed the overload capacity rating 150 for...

Страница 12: ...cified torque of 0 49 to 0 59 N m Use of the product beyond its life may result in contact welding or burning Make sure to consider the actual operating conditions and use the product within its rated...

Страница 13: ...ifficult to see 15 Do not use the product if it is accidentally dropped The internal components may be damaged 16 Be sure you understand the contents of this catalog and handle the product according t...

Страница 14: ...MEMO 14...

Страница 15: ...CONNECTED WITH THE PRODUCTS WHETHER SUCH CLAIM IS BASED IN CONTRACT WARRANTY NEGLIGENCE OR STRICT LIABILITY Further in no event shall liability of Omron Companies exceed the individual price of the Pr...

Страница 16: ...0169 U S A Tel 1 847 843 7900 Fax 1 847 843 7787 Regional Headquarters OMRON EUROPE B V Wegalaan 67 69 2132 JD Hoofddorp The Netherlands Tel 31 2356 81 300 Fax 31 2356 81 388 Contact www ia omron com...

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