Single-phase Voltage Relay
K8AB-VW
Ideal for voltage monitoring for industrial
facilities and equipment.
• Monitor for overvoltages and undervoltages simultaneously.
Separate settings and outputs supported for overvoltages and
undervoltages.
• Manual resetting and automatically resetting supported by one
Relay.
• Pre-alarm Mode (H/HH and L/LL operating modes)
• Two SPDT output relays, 6 A at 250 VAC (resistive load).
• Process control signal (0 to 10 V) and current splitter input
supported.
• Relay warning status easily monitoring using LED indicator.
• Input frequency of 40 to 500 Hz supported.
• Easy wiring with ferrules
2
×
2.5 mm
2
solid or 2
×
1.5 mm
2
standard ferrules.
• CE mark compliance certified by third party.
UL certification pending.
Model Number Structure
■
Model Number Legend
K8AB-@@
1
2 3
4
1. Basic Model
K8AB:
Measuring and Monitoring Relays
2. Functions
VW:
Single-phase Voltage Relay (Simultaneous upper and lower limit monitoring)
3.
Measuring Tension
1:
6 to 60 mV AC/DC, 10 to 100 mV AC/DC, 30 to 300 mV AC/DC
2:
1 to 10 V AC/DC, 3 to 30 V AC/DC, 15 to 150 V AC/DC
3:
20 to 200 V AC/DC, 30 to 300 V AC/DC, 60 to 600 V AC/DC
4. Supply Voltage
24 VDC:
24 VDC
24 VAC:
24 VAC
100-115 VAC: 100 to 115 VAC
200-230 VAC: 200 to 230 VAC
Cat. No. N144-E1-01
Single-phase Voltage Relay
K8AB-VW
1
Ordering Information
■
List of Models
Single-phase Voltage Relay
Measuring voltage
(See note.)
6 to 60 mV AC/DC,
10 to 100 mV AC/DC,
30 to 300 mV AC/DC
Supply voltage
24 VDC
24 VAC
100-115 VAC
200-230 VAC
1 to 10 V AC/DC,
3 to 30 V AC/DC,
15 to 150 V AC/DC
24 VDC
24 VAC
100-115 VAC
200-230 VAC
20 to 200 V AC/DC,
30 to 300 V AC/DC,
60 to 600 V AC/DC
24 VDC
24 VAC
100-115 VAC
200-230 VAC
Model
K8AB-VW1 24 VDC
K8AB-VW1 24 VAC
K8AB-VW1 100-115 VAC
K8AB-VW1 200-230 VAC
K8AB-VW2 24 VDC
K8AB-VW2 24 VAC
K8AB-VW2 100-115 VAC
K8AB-VW2 200-230 VAC
K8AB-VW3 24 VDC
K8AB-VW3 24 VAC
K8AB-VW3 100-115 VAC
K8AB-VW3 200-230 VAC
Note:
The rated input depends on the connected terminals. Select the terminals suitable for the inputs, and connect the inputs to V1-COM, V2-
COM, and V3-COM.
Ratings and Specifications
■
Ratings
Operating
power
Operation
(AL1 and
AL2)
Reset (HYS.)
Non-isolated power supply
Isolated power supply
Operating value setting
range
Operating value
Hysteresis
Resetting method
Operating time (T)
Power ON lock (LOCK)
Setting accuracy
Time error
Input frequency
Input impedance
24 VDC (1 W)
24 VAC (4 VA), 100 to 115 VAC (4 VA), 200 to 230 VAC (5 VA)
10% to 100% of maximum rated input value
100% operation at set value
5% of operating value (fixed)
Manual reset/automatic reset (switchable)
Manual reset: Turn OFF operating power for 1 s or longer.
0.1 to 30 s (Value when input rapidly changes from 0% to 120%.)
1 s or 5 s error
±0.5
s (Value when input rapidly changes from 0% to 100%. The operating time is
the shortest at this point.)
±10% of full scale
±10% of set value (Minimum error: 50 ms)
40 to 500 Hz
K8AB-VW1: 9 kΩ min.
K8AB-VW2: 100 kΩ min.
K8AB-VW3: 1 MΩ min.
Power (PWR): Green LED, Relay output (RY): Yellow LED, Alarm outputs (ALM1/2): Red LED
Two SPDT relays (6 A at 250 VAC, resistive load), Normally closed operation (normally ON)
(separate outputs possible for overvoltages and undervoltages)
Indicators
Output relays
2
Single-phase Voltage Relay
K8AB-VW
Cat. No. N144-E1-01
■
Specifications
Ambient operating temperature
Storage temperature
Ambient operating humidity
Storage humidity
Altitude
Operating voltage range
Rated power supply frequency
Output relays
Resistive load
Inductive load
Minimum load
−20
to 60°C (with no condensation or icing)
−40
to 70°C (with no condensation or icing)
25% to 85%
25% to 85%
2,000 m max.
85% to 110% of rated operating voltage
50/60 Hz ±5 Hz (AC power supply)
6 A at 250 VAC (cos
φ
= 1)
6 A at 30 VDC (L/R = 0 ms)
1 A at 250 VAC (cos
φ
= 0.4)
1 A at 30 VDC (L/R = 7 ms)
10 mA at 5 VDC
Maximum contact voltage
250 VAC
Maximum contact current
6 A AC
Maximum switching
capacity
Mechanical life
Electrical life
Terminal screw tightening torque
Crimp terminals
Insulation resistance
1,500 VA
10,000,000 operations
Make: 50,000 times, Break: 30,000 times
1.2 N·m
Two solid wires of 2.5 mm
2
, two crimp terminals of 1.5 mm
2
with insulation sleeves, can be
tightened together
20 MΩ (at 500 V) between charged terminals and exposed uncharged parts
20 MΩ (at 500 V) between any charged terminals (i.e., between input, output, and power
supply terminals)
Terminal section: IP20, Rear case: IP40
Munsell 5Y8/1 (ivory)
ABS resin (self-extinguishing resin) UL94-V0
200 g
Mounted to DIN Track or via M4 screws
22.5 (W) x 90 (H) x 100 (D) mm
Overvoltage Category III, Pollution Degree 2
EN60255-5/-6
EN60664-1
EMI: EN61326 Industrial applications
Electromagnetic interference wave
CISPR11 Group 1, Class A: CISPR16-1/-2
Terminal interference wave voltage
CISPR11 Group 1, Class A: CISPR16-1/-2
EMS: EN61326 Industrial applications
Electrostatic discharge EN61000-4-2: 8 kV (in air)
Radiating radio-frequency electromagnetic field EN61000-4-3:
10 V/m 1 kHz sine wave amplitude modulation (80 MHz to 1 GHz)
Burst EN61000-4-4:
1 kV (I/O signal line), 2 kV (power line)
Surge EN61000-4-5:
1 kV with line (power line),
2 kV with ground (power line)
Conducted RF EN61000-4-6:
3 V (0.15 to 80 MHz)
Power frequency magnetic field immunity
EN61000-4-8: 30 A/m
Voltage dip/short interruptions
EN61000-4-11: 0.5 cycle, 0.180° each, polarity 100% (rated voltage)
Degree of protection
Case color
Case material
Weight
Mounting
Dimensions
Installation environment
Application standards
Safety standards
EMC
Cat. No. N144-E1-01
Single-phase Voltage Relay
K8AB-VW
3
Connections
■
Wiring Diagram
Overvoltage and Undervoltage
Operation Diagram
Control power
Overvoltage setting (AL1)
Hysteresis: Fixed at 5%
Overvoltage and Undervoltage
Operation Diagram (Undervoltage Pre-
alarm Mode)
Control power
Voltage input value
Undervoltage set value (AL1)
Undervoltage set value (AL2)
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Voltage input value
Undervoltage set value (AL2)
Flashing
AL1 alarm indicator
Flashing
AL2 alarm indicator
Overvoltage (AL1) relay
Lit
Lit
T
T: Operating time (0.1 to 30 s)
AL1 alarm indicator
Flashing
Lit
Flashing
AL2 alarm indicator
Lit
Undervoltage (AL2) relay
T
T1
T: Operating time (0.1 to 30 s)
Undervoltage (AL1) relay
Undervoltage (AL2) relay
T1: Power ON lock (1 s or 5 s)
T1: Power ON lock (1 s or 5 s)
Note: 1.
The K8AB-VW output relay is normally operative.
2.
The power ON lock prevents unnecessary alarms from
being generated during the instable period when the power
is first turned on. There is no relay output during timer
operation.
Single-phase power
T1
Note: 1.
The K8AB-VW output relay is normally operative.
2.
The power ON lock prevents unnecessary alarms from
being generated during the instable period when the power
is first turned on. There is no relay output during timer
operation.
Model
A1
Operating
power
Measuring range
6 to 60 mV AC/DC
10 to 100 mV AC/DC
30 to 300 mV AC/DC
Connection
V1-COM
V2-COM
V3-COM
V1-COM
V2-COM
V3-COM
V1-COM
V2-COM
V3-COM
K8AB-VW1
A2
V1
K8AB-VW2
COM
1 to 10 V AC/DC
3 to 30 V AC/DC
15 to 150 V AC/DC
Input
V2
V3
14
11
AL1
K8AB-VW3
20 to 200 V AC/DC
30 to 300 V AC/DC
60 to 600 V AC/DC
Output
12
24
Output
Load
21
22
AL2
Overvoltage and Undervoltage
Operation Diagram (Overvoltage Pre-
alarm Mode)
Control power
Overvoltage setting (AL1)
Hysteresis: Fixed at 5%
Overvoltage setting (AL2)
Hysteresis: Fixed at 5%
Voltage input value
Flashing
AL1 alarm indicator
AL2 alarm indicator
Overvoltage (AL1) relay
Undervoltage (Al2) relay
Flashing
Lit
Lit
T1: Power ON lock (1 s or 5 s)
T1
Note: 1.
The K8AB-VW output relay is normally operative.
2.
The power ON lock prevents unnecessary alarms from
being generated during the instable period when the power
is first turned on. There is no relay output during timer
operation.
4
Single-phase Voltage Relay
K8AB-VW
Cat. No. N144-E1-01
Nomenclature
■
Front
Indicators
Item
Power indicator
(PWR: Green)
Relay status
indicator
(RY: Yellow)
Alarm indicators
(AL1 and AL2: Red)
Meaning
Lit when power is being supplied.
Lit when relay operates (Not light when both
AL1 and AL2 are in error status) (Normally lit)
Lit when there is an overvoltage or
undervoltage.
The indicator flashes to indicate the error
status after the input has exceeded the
threshold value while the operating time is
being clocked.
Voltage knob (AL1)
Power indicator
Relay status indicator
Alarm indicator
Voltage knob (AL2)
Operating time knob (T)
Setting Knobs
Item
Voltage knob (AL1)
Voltage knob (AL2)
Operating time knob (T)
Usage
Used to set the voltage to 10% to 100%
of maximum rated input voltage.
Used to set the voltage to 10% to 100%
of maximum rated input voltage.
Used to set the operating time to 0.1 to
30 s.
■
Function Selection DIP Switch
ON
DIP Switch Functions
Function
SW1
Operating power ON lock
OFF
time
ON
SW2
Resetting method
OFF
ON
SW3 SW4
Function
1s
5s
Manual reset
Automatic
reset
Default
OFF
OFF
SW1
SW2
SW3
SW4
DIP Switch
Default
SW3 SW4
OFF
OFF
OFF OFF Operating AL1: Overvoltage,
mode
AL2: Undervoltage
ON
OFF
AL1: Overvoltage,
AL2: Overvoltage
AL1: Undervoltage,
AL2: Undervoltage
AL1: Overvoltage,
AL2: Undervoltage
OFF ON
ON
ON
Dimensions
K8AB-VW
22.5
100
5
90
5
Cat. No. N144-E1-01
Single-phase Voltage Relay
K8AB-VW
5
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