Three-phase Voltage Relay
K8AB-PW
Ideal for monitoring 3-phase power supplies
for industrial facilities and equipment.
• Monitor overvoltages and undervoltages for three-phase 3-wire
or 4-wire power supplies.
Switch setting for 3-phase 3-wire or 3-phase 4-wire power
supply.
• Two SPDT output relays, 6 A at 250 VAC (resistive load).
Separate outputs possible for overvoltages and undervoltages.
• World-wide power specifications supported by one Unit
(switchable).
• 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
2
solid or 2 × 1.5 mm2 standard ferrules.
■ Model Number Legend
K8AB-@@
123
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
PW: Three-phase Voltage Relay (Simultaneous upper and lower monitoring)
3. Rated Input Voltage
1: 115, 127, 133, 138, 200, 220, 230, 240 VAC
2: 220, 230, 240, 277, 380, 400, 415, 480 VAC
Cat. No. N148-E1-01 Three-phase Voltage Relay K8AB-PW 1
Ordering Information
■ List of Models
Three-phase Voltage Relay Rated input (See note 2.) Model
3-phase 3-wire mode 200, 220, 230, 240 VAC K8AB-PW1
3-phase 4-wire mode 115, 127, 133, 138 VAC
3-phase 3-wire mode 380, 400, 415, 480 VAC K8AB-PW2
3-phase 4-wire mode 220, 230, 240, 277 VAC
Note: 1. Three-phase 3-wire or 4-wire and the input range are switched using a switch.
2. The power supply is shared with the rated input voltage.
Ratings and Specifications
■ Ratings
Rated input
voltage
Operation
(overvoltage and
undervoltage)
Reset (HYS.) Hysteresis 5% of operating value (fixed)
Operating time (T) Overvoltage/
Power ON lock (LOCK) 1 s or 5 s (Value when input rapidly changes from 0% to 100%. The operating time is the shortest
Setting accuracy ±10% of full scale
Time error ±10% of set value (Minimum error: 50 ms)
Input frequency 45 to 65 Hz
Input impedance 100 kΩ min.
Indicators Power (PWR): Green LED, Relay output (RY): Yellow LED, Alarm outputs (ALM1/2): Red LED
Output relays Two SPDT relays (6 A at 250 VAC, resistive load)
K8AB-PW1 Three-phase, three-wire mode: 200, 220, 230, 240 VAC
K8AB-PW2 Three-phase, three-wire mode: 380, 400, 415, 480 VAC
Operating value setting
range
Operating value 100% operation at set value
Resetting method Automatic reset
undervoltage
Three-phase, four-wire mode: 115, 127, 133, 138 VAC
Three-phase, four-wire mode: 220, 230, 240, 277 VAC
Overvoltage = −30% to 25% of maximum rated input voltage
Undervoltage = −30% to 25% of maximum rated input voltage
Note: The rated input voltage is switched with a switch.
0.1 to 30 s (Value when input rapidly changes from 0% to 120%.)
at this point.)
Normally closed operation (normally ON) (separate outputs possible for overvoltages and
undervoltages)
2 Three-phase Voltage Relay K8AB-PW Cat. No. N148-E1-01
■ Specifications
Ambient operating temperature −20 to 60°C (with no condensation or icing)
Storage temperature −40 to 70°C (with no condensation or icing)
Ambient operating humidity 25% to 85%
Storage humidity 25% to 85%
Altitude 2,000 m max.
Voltage fluctuation range 85% to 110% of rated input voltage
Input frequency 50/60 Hz ±5 Hz (AC power supply)
Output relays Resistive load 6 A at 250 VAC (cos φ = 1)
Inductive load 1 A at 250 VAC (cos φ = 0.4)
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 MΩ (at 500 V) between charged terminals and exposed uncharged parts
Degree of protection Terminal section: IP20, Rear case: IP40
Case color Munsell 5Y8/1 (ivory)
Case material ABS resin (self-extinguishing resin) UL94-V0
Weight 200 g
Mounting Mounted to DIN Track or via M4 screws
Dimensions 22.5 (W) x 90 (H) x 100 (D) mm
Installation environment Overvoltage Category III, Pollution Degree 2
Application standards EN60255-5/-6
Safety standards EN60664-1
EMC EMI: EN61326 Industrial applications
6 A at 30 VDC (L/R = 0 ms)
1 A at 30 VDC (L/R = 7 ms)
1,500 VA
2
Two solid wires of 2.5 mm
tightened together
20 MΩ (at 500 V) between any charged terminals (i.e., between input, output, and power
supply terminals)
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),
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)
, two crimp terminals of 1.5 mm2 with insulation sleeves, can be
2 kV with ground (power line)
Cat. No. N148-E1-01 Three-phase Voltage Relay K8AB-PW 3
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