Omron K8AB-PH DATASHEET
Phase-sequence Phase-loss Relay
K8AB-PH
Ideal for phase sequence and phase loss
monitoring for industrial facilities and
equipment.
• Simultaneously monitor phase sequence and phase loss for
three-phase 3-wire power supplies.
• One SPDT output relay, 6 A at 250 VAC (resistive load).
• 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
■ Model Number Legend
2
solid or 2 × 1.5 mm2 standard ferrules.
K8AB-@@
123
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
PH: Phase-sequence Phase-loss Relay
3. Rated Input Voltage
1: 200 to 500 VAC
Cat. No. N145-E1-01 Phase-sequence Phase-loss Relay K8AB-PH 1
Ordering Information
■ List of Models
Phase-sequence Phase-loss Relay Rated input voltage (See note.) Model
200 to 500 VAC K8AB-PH1
Note: The power supply is shared with the rated input voltage.
Ratings and Specifications
■ Ratings
Rated input voltage Non-isolated 200 to 500 VAC (15 VA)
Phase sequence, phase loss operating time 0.1 s max. (value when rated operating voltage changes quickly from 0% to 100%)
Resetting method Automatic reset
Input frequency 45 to 65 Hz
Input impedance 100 kΩ min.
Indicators Power (PWR): Green LED, Relay output (RY): Yellow LED
Output relays One SPDT relay (6 A at 250 VAC, resistive load)
(Relays are normally ON and turn OFF for phase sequence or loss phase errors.)
2 Phase-sequence Phase-loss Relay K8AB-PH Cat. No. N145-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. N145-E1-01 Phase-sequence Phase-loss Relay K8AB-PH 3
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