K8DT-AS

Features

Single-phase current relay

Detect errors in motors and other equipment through current changes. Use in either overcurrent or undercurrent mode.

  • Monitor AC or DC currents with one relay.
  • Use with commercially available CTs (CT secondary side: 0 to 1 A or 0 to 5 A).
  • Settings for the operating value, hysteresis, startup lock time, and operating time.
  • Width of 17.5 mm to reduce space required in panels.
  • Push-in plus Technology that reduce wiring work.
  • UL listed for easy shipping to North America.
  • Double-insertion holes for crossover wiring (all terminals).
  • Models added with transistor outputs for superior contact reliability.
  • RoHS compliant
Specifications & ordering info

Ordering information

Setting range

Power supply voltage

Output

Order code

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

24 VAC/DC

Relay: SPDT contact output

K8DT-AS1CD

Transistor: Open collector

K8DT-AS1TD

100 to 240 VAC

Relay: SPDT contact output

K8DT-AS1CA

Transistor: Open collector

K8DT-AS1TA

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

24 VAC/DC

Relay: SPDT contact output

K8DT-AS2CD

Transistor: Open collector

K8DT-AS2TD

100 to 240 VAC

Relay: SPDT contact output

K8DT-AS2CA

Transistor: Open collector

K8DT-AS2TA

10 to 100 A AC 1 ,
20 to 200 A AC 1

24 VAC/DC

Relay: SPDT contact output

K8DT-AS3CD

Transistor: Open collector

K8DT-AS3TD

100 to 240 VAC

Relay: SPDT contact output

K8DT-AS3CA

Transistor: Open collector

K8DT-AS3TA

Accessories

Omron CT

Appearance

Input range

Applicable relay

Order code

 

 

10 to 100 A AC, 20 to 200 A AC

K8AK-AS3

K8AC-CT200L

Commercially Available CTs

Appearance

CT current on secondary side

Applicable Relay

 

0 to 1 A AC,

0 to 5 A AC

K8DT-AS2

Front Cover (Order separately)

Appearance

Order code

 

Y92A-D1A

Specifications

Item

K8DT-AS1

K8DT-AS2

K8DT-AS3

Power supply voltage

K8DT-AS__D

24 VAC 50/60 Hz, 24 VDC

K8DT-AS__A

100 to 240 VAC 50/60 Hz

Power consumption

24 VAC/DC: 1.8 VA/1 W max.

100 to 240 VAC: 2.5 VA max.

Operate (SV)

Operating value setting range

10% to 100% of the maximum value of the setting range

2 to 20 mA AC/DC

10 to 100 mA AC/DC

50 to 500 mA AC/DC

10% to 100% of the maximum value of the setting range

0.1 to 1 A AC/DC (Compatible with commercially available CTs.)

0.5 to 5 A AC/DC (Compatible with commercially available CTs.)

10% to 100% of the maximum value of the setting range

When used with the OMRON CT (K8AC-CT200L).

10 to 100 A AC

20 to 200 A AC

Operating value

100% operation at set value

Reset (HYS)

Hysteresis

5% to 50% of operating value

Resetting method

Manual reset/automatic reset (switchable)

Operating time setting range (T)

0.1 to 30 s

Startup lock time setting range (LOCK)2

0 to 30 s (The startup lock timer starts when the input has reached approximately 30% or more of the set value.)

Indicators

Power (PWR): Green, Output (OUT): Yellow, Alarm outputs (ALM): Red

Output form

Relay: SPDT contact output

Transistor: Open collector

Switchable between normally open and normally closed with a DIP switch setting.

Output relays ratings

Resistive load

250 VAC 5 A or 30 VDC 5 A

Inductive load

250 VAC 1 A,
48 VDC 0.2 A

Minimum load

5 VDC, 10 mA (reference values)

Mechanical life

10 million operations min.

Electrical life

5 A at 250 VAC or 30 VDC: 50,000 operations

3 A at 250 VAC or 30 VDC:100,000 operation

Transistor output ratings

Contact form

SPST-NO (Open collector)

Rated voltage

24 VDC (maximum voltage: 26.4 VDC)

Maximum current

50 mA DC

Ambient operating temperature

-20 to 60°C (with no condensation or icing)

Storage temperature

-25 to 65°C (with no condensation or icing)

Case material

PC, UL 94 V-0

Weight

Approx. 100 g

Size in mm (H × W × D)

90×17.5×90

Operating voltage range

85% to 110% of power supply voltage

Rated power supply frequency

50/60 Hz ±5 Hz

Input frequency range

DC input or AC input (45 to 65 Hz)

AC input (45 to 65 Hz)

Overload capacity3

Continuous input at 120% of maximum input, 1 s at 150%

Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT (K8AC-CT200L)

Repeat error

Operating value

±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage)

Operating time

±50 ms (at 25°C and 65% humidity, rated power supply voltage)

Applicable standards

Conforming standards

EN 60947-5-1

Installation environment (pollution level 2, Overvoltage category III)

EMC

EN 60947-5-1

Safety standards

UL 60947-5-1 (Listing), Korean Radio Waves Act (Act 10564), CCC (GB14048.5)

Degree of protection

Terminals: IP20


1. The K8DT-AS3__ is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)

2. Enabled only for overcurrent operation.

3. Overload capacity of primary side of CT.

1. The K8DT-AS3__ is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)

2. Enabled only for overcurrent operation.

3. Overload capacity of primary side of CT.

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