Cat. No. N145-E1-02 Phase-sequence Phase-loss Relay K8AB-PH 3
■ Specifications
Connections
■ Wiring Diagram
Phase Sequence and Phase Loss Operation Diagram
Note: 1. Motor load phase loss cannot be detected. To detect motor load
phase loss, use the K8AB-PM or K8AB-PA.
2. The K8AB-PH output relay is normally operative.
3. L1 and L3 function both as the power supply terminals and as input
terminals. If the voltage drops below the minimum input voltage (60%),
then the Relay will not operate due to an undervoltage.
4. Phase loss is detected based on the phase sequence, so phase loss
cannot be detected for loads that generate inductive power, e.g., due
to monitoring during operation.
5. Phase loss is detected based on voltage, so phase loss cannot be
detected on the load side.
Input voltage range 200 to 500 VAC
Input frequency range 45 to 65 Hz
Overload capacity Continuous input: 115% of maximum input, 10 s max.: 125% of maximum input
Temperature influence Operating time
Fluctuation based on measured value at standard temperature:
−20°C to standard temperature: ±10% max.
Standard temperature to 60
°C : ±10% max.
(Humidity: 25% to 80%)
Humidity influence Operating time
Based on ambient room humidity
25% to 80%:
±10% max.
Influence of power supply voltage Operating time:
±10% max.
Note: The error in the operating value and operating time under standard conditions.
Influence of power supply frequency Operating time: ±10% max. (at 45 to 65 Hz)
Note: The error in the operating value and operating time under standard conditions.
Influence of input frequency At 45 to 65 Hz
Operating time ±10% max.
Note: The error in the operating value and operating time under standard conditions.
Applicable
standards
Conforming standards EN60255-5 and EN60255-6
Installation environment (Pollution Degree 2, Overvoltage Category III)
EMC EN61326
Safety standards UL508
Insulation resistance 20 M
Ω min.
Between external terminals and case
Between input terminals and output terminals
Dielectric strength 2,000 VAC for one minute
Between external terminals and case
Between input terminals and output terminals
Noise immunity 1,500 V power supply terminal common/normal mode
Square-wave noise of ±1
µs/100 ns pulse width with 1-ns rise time
Vibration resistance
Frequency 10 to 55 Hz, 0.35-mm single amplitude, acceleration 50 m/s
2
10 sweeps of 5 min each in X, Y, and Z directions
Shock resistance
100 m/s
2
, 3 times each in 6 directions along three axes (up/down, left/right, forward/backward)
Degree of protection Terminal section: Finger protection
L1
L2
L3
L1
L3
L2
L3
L2
L1
L1
L2
L3
Relay
Phase Loss Operation
Phase Sequence Operation
Input
Load
Voltage input
Signal output
14
12
L1
L2
L3
11
Relay signal
output
L1 L2 L3
