Single-phase Current Relay
K8AB-AS
CSM_K8AB-AS_DS_E_5_1
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.
Refer to
Safety Precautions for the K8AB
Series.
Refer to page 9 for the Q&A section.
Model Number Structure
■
Model Number Legend
K8AB-@@
1
2 3
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
1
K8AB-AS
Ordering Information
■
List of Models
Single-phase Current Relay
Measuring current
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.)
Supply voltage
24 VAC/DC
100-115 VAC
200-230 VAC
24 VAC/DC
100-115 VAC
200-230 VAC
24 VAC/DC
100-115 VAC
200-230 VAC
Model
K8AB-AS1 24 VAC/DC
K8AB-AS1 100-115 VAC
K8AB-AS1 200-230 VAC
K8AB-AS2 24 VAC/DC
K8AB-AS2 100-115 VAC
K8AB-AS2 200-230 VAC
K8AB-AS3 24 VAC/DC
K8AB-AS3 100-115 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.)
■
Accessory (Order Separately)
OMRON CT
Current Transformer
Input range
10 to 100 A AC,
20 to 200 A AC
Applicable Relay
K8AB-AS3
Model
K8AC-CT200L
Other CTs
CT current on secondary side
0 to 1 A AC,
0 to 5 A AC
Applicable Relay
K8AB-AS2
Ratings and Specifications
■
Input Range
Model
K8AB-AS1
Range*
0 to 20 mA AC/DC
0 to 100 mA AC/DC
0 to 500 mA AC/DC
K8AB-AS2
0 to 1 A AC/DC
0 to 5 A AC/DC
0 to 8 A AC/DC
K8AB-AS3
0 to 100 A AC
0 to 200 A AC
Connection terminal
I1-COM
I2-COM
I3-COM
I1-COM
I2-COM
I3-COM
I2-COM
I3-COM
10 to 100 A AC,
20 to 200 A AC
(See note.)
Measuring current
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
Input impedance
Approx. 5
Ω
Approx. 1
Ω
Approx. 0.2
Ω
Approx. 0.12
Ω
(Load: 0.5 VA)
Approx. 0.02
Ω
(Load: 1.5 VA)
Approx. 0.02
Ω
(Load: 3 VA)
Using OMRON CT
Using OMRON CT
Continuous input:
120% of maximum input
30 s max.:
200% of maximum input
1 s max.:
600% of maximum input
Overload capacity
Continuous input:
120% of maximum input
1 s max.:
150% 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
K8AB-AS
■
Ratings
Power supply
voltage
Isolated power supply
24 VDC, 24 VAC, 100 to 115 VAC, 200 to 230 VAC
24 VDC:
1 W max.
24 VAC:
4 VA max.
100 to 115 VAC: 4 VA max.
200 to 230 VAC: 5 VA max.
10% to 100% of maximum measuring current
K8AB-AS1: 2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
K8AB-AS2: 0.1 to 1 A AC/DC
0.5 to 5 A AC/DC
0.8 to 8 A AC/DC
K8AB-AS3: When used together with a K8AC-CT200L Current Transformer
10 to 100 A AC
20 to 200 A AC
100% operation at set value
5% to 50% of operating value
Manual reset/automatic reset (switchable)
Note:
Manual reset: Turn OFF power supply for 1 s or longer.
0.1 to 30 s
0 to 30 s
(The startup lock timer starts when the input has reached approximately 30% or more of the set value.)
Note:
Enabled only for overcurrent operation.
Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
Refer to "Input Range" on previous page.
One SPDT relay (NO/NC switched using DIP switch.)
Rated load
Resistive load
6 A at 250 VAC (cosφ = 1)
6 A at 30 VDC (L/R = 0 ms)
Inductive load
1 A at 250 VAC (cosφ = 0.4)
1 A at 30 VDC (L/R = 7 ms)
Maximum contact voltage:
250 VAC
Maximum contact current:
6 A AC
Maximum switching capacity: 1,500 VA
Minimum load:
10 mA at 5 VDC
Mechanical life:
10,000,000 operations
Electrical life:
Make: 50,000 times, Break: 30,000 times
−20
to 60°C (with no condensation or icing)
−40
to 70°C (with no condensation or icing)
25% to 85% (with no condensation)
25% to 85% (with no condensation)
2,000 m max.
0.49 N·m
Recommended wire
Solid wire:
2.5 mm
2
Twisted wires: AWG16, AWG18
Note: 1.
Ferrules with insulating sleeves must be used with twisted wires.
2.
Two wires can be twisted together.
Recommended ferrules
Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact
Al 1-8RD (for AWG18) manufactured by Phoenix Contact
Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Munsell 5Y8/1
PBT/ABS resin (self-extinguishing resin) UL94-V0
Approx. 130 g
Mounted to DIN Track or via M4 screws (tightening torque: 1.2 N·m)
22.5 (W)
×
90 (H)
×
100 (D) mm
Power consumption
Operating value setting range (SV)
Operating value
Reset value setting range (HYS.)
Reset method
Operating time setting range (T)
Startup lock time setting range (LOCK)
Note:
Enabled only for overcurrent operation.
Indicators
Input impedance
Output relays
Output relay ratings
Ambient operating temperature
Storage temperature
Ambient operating humidity
Storage humidity
Altitude
Terminal screw tightening torque
Terminal wiring method
Case color
Case material
Weight
Mounting
Dimensions
3
K8AB-AS
■
Specifications
Allowable power supply voltage range
Allowable power supply frequency range
Input frequency range
Overload capacity
85% to 110% of power supply voltage
50/60 Hz
±5
Hz
K8AB-AS1 and K8AB-AS2: DC input or AC input (45 to 65 Hz)
K8AB-AS3:
AC input (45 to 65 Hz)
K8AB-AS1 and K8AB-AS2: Continuous input: 120% of maximum input, 1 s max.: 150% of maximum input.
K8AB-AS3:
Continuous input: 120% of maximum input, 30 s max.: 200% of maximum input,
1 s max.: 600% of maximum input
Note:
Overload capacity of primary side of CT.
Operating value
Reset value
Operating time
Startup lock time
Repeat error
Operating value
Operating value
±2%
Error calculation: Error = ((Maximum operating value
−
Minimum operating value (over 10 operations))/2)/
Average value
×
100%
Reset value
±2%
Error calculation: Error = ((Maximum reset value
−
Minimum reset value (over 10 resets))/2)/Average value
×
100%
Operating time repeat error:
±50
ms
Overcurrent:
Measured when input suddenly changes from 0% to 120% of setting.
Undercurrent:
Measured when input suddenly changes from 120% to 0% of setting.
Startup lock time repeat error:
±50
ms (measured at sudden change from 0% to 120% of setting)
Operating value
Drift based on measured value at standard temperature:
−20°C
to standard temperature:
±1,000
ppm/°C max.
Standard temperature to 60°C:
±1,000
ppm/°C max.
(Humidity: 25% to 80%)
Operating time
Fluctuation based on measured value at standard temperature:
−20°C
to standard temperature:
±10%
max.
Standard temperature to 60°C:
±10%
max.
(Humidity: 25% to 80%)
Operating value
Based on ambient humidity of 65%
25% to 80%:
±5%
max.
Operating time
Based on ambient room humidity
25% to 80%:
±10%
max.
Operating value:
±5%
max.
Operating time:
±10%
max.
Note:
The error in the operating value and operating time under standard conditions.
Operating value: ±5% max. (at 45 to 65 Hz)
Operating time: ±10% max. (at 45 to 65 Hz)
Note:
The error in the operating value and operating time under standard conditions.
Operating value (45 to 65 Hz)
K8AB-AS1 and K8AB-AS2:
±5%
max.
K8AB-AS3:
±10%
max.
Operating time (45 to 65 Hz)
±10%
max.
Note:
The error in the operating value and operating time under standard conditions.
EN60255-5 and EN60255-6
Installation environment (Pollution Degree 2, Overvoltage Category III)
EN61326
20 MΩ min.
Between external terminals and case
Between power supply terminals and input terminals (excluding models with DC power supply)
Between power supply terminals and output terminals
Between input terminals and output terminals
2,000 VAC for one minute
Between external terminals and case
Between power supply terminals and input terminals (excluding models with DC power supply)
Between power supply terminals and output terminals
Between input terminals and output terminals
1,500 V power supply terminal common/normal mode
Square-wave noise of ±1
µs/100
ns pulse width with 1-ns rise time
Frequency 10 to 55 Hz, 0.35-mm single amplitude, acceleration 50 m/s
2
10 sweeps of 5 min each in X, Y, and Z directions
100 m/s
2
, 3 times each in 6 directions along three axes (up/down, left/right, forward/backward)
Terminal section: Finger protection
Set value
±10%
full scale
Setting error
Reset value
Operating time
Startup lock time
Temperature influence
Humidity influence
Influence of power supply voltage
Influence of power supply frequency
Influence of input frequency
Applicable
standards
Conforming standards
EMC
Insulation resistance
Dielectric strength
Noise immunity
Vibration resistance
Shock resistance
Degree of protection
4
K8AB-AS
Connections
■
Wiring Diagram
Overcurrent Operation Diagram
(Output Relay Drive Method: Normally
Open)
DIP switch setting: SW3 OFF.
Power supply
voltage
Hysteresis
(−5% to 50% of operating value)
Single-phase power
Single-phase power
A1
Power supply
voltage
Power supply
voltage
A1
A2
I1
or
Current
input
I2
I3
COM
11
14
Signal
output
12
11
A2
I1
Current
input
I2
I3
COM
14
Signal
output
12
Operating value
Input
Flashing
Alarm indicator
Lit
Relay 11-14
Relay 11-12
T: Operating time (0.1 to 30 s)
T
Lock: Startup lock time (0 to 30 s)
LOCK
Relay
signal
output
Relay
signal
output
Load
Load
Undercurrent Operation Diagram
(Output Relay Drive Method: Normally
Closed)
DIP switch setting: SW3 ON.
Power supply
voltage
Note: 1.
The K8AB-AS3 is designed to be used in combination with
the OMRON K8AC-CT200L Current Transformer (CT).
2.
There is no polarity when a DC current input is used.
3.
Refer to the “Setting
Ranges and Wiring Connections”
as
the explanation of current input l1, l2, and l3 terminal.
Operating value
Input
Alarm indicator
Relay 11-14
Relay 11-12
T
T: Operating time (0.1 to 30 s)
Flashing
Lit
Hysteresis
(5% to 50% of operating value)
5
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