Omron K8AB-PA1, K8AB-PA2 Product Manual

Cat. No. N147-E1-01 Three-phase Asymmetry and Phase-sequence Phase-loss Relay K8AB-PA 1

Three-phase Asymmetry and Phase-sequence
Phase-loss Relay

K8AB-PA

Ideal for 3-phase voltage asymmetry
monitoring for industrial facilities and
equipment.

• Monitor voltage asymmetry, phase sequence, and phase loss
for three-phase 3-wire or 4-wire power supplies with just one
Unit.
Switch setting for 3-phase 3-wire or 3-phase 4-wire power
supply.

• One SPDT output relay, 6 A at 250 VAC (resistive load).

• 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

2

solid or 2 × 1.5 mm2 standard ferrules.

• CE mark compliance certified by third party.
UL certification pending.

Model Number Structure

■ Model Number Legend

1. Basic Model

K8AB: Measuring and Monitoring Relays

2. Functions

PA: Three-phase Asymmetry and Phase-sequence Phase-loss Relay.

3. Rated Input Voltage

1: AC 115, 127, 133, 138, 200, 220, 230, 240
2: AC 220, 230, 240, 277, 380, 400, 415, 480

123

K8AB-@@

2 Three-phase Asymmetry and Phase-sequence Phase-loss Relay K8AB-PA Cat. No. N147-E1-01

Ordering Information

■ List of Models

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

Three-phase Asymmetry and Phase-sequence

Phase-loss Relay

Rated input (See note 2.) Model

3-phase 3-wire mode AC 200, 220, 230, 240 K8AB-PA1

3-phase 4-wire mode AC 115, 127, 133, 138

3-phase 3-wire mode AC 380, 400, 415, 480 K8AB-PA2

3-phase 4-wire mode AC 220, 230, 240, 277

Rated input
voltage

K8AB-PA1 Three-phase, three-wire mode: 200, 220, 230, 240 VAC

Three-phase, four-wire mode: 115, 127, 133, 138 VAC

K8AB-PA2 Three-phase, three-wire mode: 380, 400, 415, 480 VAC

Three-phase, four-wire mode: 220, 230, 240, 277 VAC

Asymmetry
operation
(ASY.)

Operating value setting
range

Asymmetry rate: 2% to 22%

Operating value 100% operation at set value

Asymmetry operating value = Rated input voltage x Asymmetry set value [%]
The asymmetry operation will function when the difference between the highest and lowest

voltage phases equals or exceeds the asymmetry operating value.

Reset (HYS.) Hysteresis 5% of operating value (fixed)

Resetting method Automatic reset

Operating
time (T)

Asymmetry 0.1 s to 30 s (Value when input rapidly changes from 0% to 120%.)

Phase sequence, phase loss 0.1 s max. (Value when input rapidly changes from 0% to 100%.)

Power ON lock (LOCK) 1 s or 5 s (Value when input rapidly changes from 0% to 100%. The operating time is the shortest

at this point.)

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 One SPDT relay (6 A at 250 VAC, resistive load) , normally closed operation (normally ON)

Cat. No. N147-E1-01 Three-phase Asymmetry and Phase-sequence Phase-loss Relay K8AB-PA 3

■ 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)

6 A at 30 VDC (L/R = 0 ms)

Inductive load 1 A at 250 VAC (cos φ = 0.4)

1 A at 30 VDC (L/R = 7 ms)

Minimum load 10 mA at 5 VDC

Maximum contact voltage 250 VAC

Maximum contact current 6 A AC

Maximum switching
capacity

1,500 VA

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

Two solid wires of 2.5 mm

2

, two crimp terminals of 1.5 mm2 with insulation sleeves, can be

tightened together

Insulation resistance 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)

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

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)