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
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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 k
Ω
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)
