4
Single-phase Current Relay
K8AB-AS
Cat. No. N142-E1-02
■
Specifications
Allowable power supply voltage range
85% to 110% of power supply voltage
Allowable power supply frequency range
50/60 Hz
±
5 Hz
Input frequency range
K8AB-AS1 and K8AB-AS2: DC input or AC input (45 to 65 Hz)
K8AB-AS3:
AC input (45 to 65 Hz)
Overload capacity
K8AB-AS1 and K8AB-AS2: Continuous input: 120% of maximum input, 1 s max.: 150% of maximum input.
K8AB-AS3:
Continuous input: 120% of maximum input, 30 s max.: 200% of maximum input,
1 s max.: 600% of maximum input
Note:
Overload capacity of primary side of CT.
Setting error
Operating value
Set value
±
10% full scale
Reset value
Operating time
Startup lock time
Repeat error
Operating value
Operating value
±
2%
Error calculation: Error = ((Maximum operating value
−
Minimum operating value (over 10 operations))/2)/
Average value
×
100%
Reset value
Reset value
±
2%
Error calculation: Error = ((Maximum reset value
−
Minimum reset value (over 10 resets))/2)/Average value
×
100%
Operating time
Operating time repeat error:
±
50 ms
Overcurrent:
Measured when input suddenly changes from 0% to 120% of setting.
Undercurrent:
Measured when input suddenly changes from 120% to 0% of setting.
Startup lock time
Startup lock time repeat error:
±
50 ms (measured at sudden change from 0% to 120% of setting)
Temperature influence
Operating value
Drift based on measured value at standard temperature:
−
20
°
C to standard temperature:
±
1,000 ppm/
°
C max.
Standard temperature to 60
°
C:
±
1,000 ppm/
°
C max.
(Humidity: 25% to 80%)
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 value
Based on ambient humidity of 65%
25% to 80%:
±
5% max.
Operating time
Based on ambient room humidity
25% to 80%:
±
10% max.
Influence of power supply voltage
Operating value:
±
5% max.
Operating time:
±
10% max.
Note:
The error in the operating value and operating time under standard conditions.
Influence of power supply frequency
Operating value: ±5% max. (at 45 to 65 Hz)
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
Operating value (45 to 65 Hz)
K8AB-AS1 and K8AB-AS2:
±
5% max.
K8AB-AS3:
±
10% max.
Operating time (45 to 65 Hz)
±
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 power supply terminals and input terminals (excluding models with DC power supply)
Between power supply terminals and output terminals
Between input terminals and output terminals
Dielectric strength
2,000 VAC for one minute
Between external terminals and case
Between power supply terminals and input terminals (excluding models with DC power supply)
Between power supply terminals and output terminals
Between input terminals and output terminals
Noise immunity
1,500 V power supply terminal common/normal mode
Square-wave noise of ±1
µ
s/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
