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2. Hysteresis
Hysteresis is set using the hysteresis knob (HYS.)
The setting range is 5 to 50% of the operating value.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the hysteresis.
Example: Maximum of 200 A AC, Current Setting (SV) of 50%, and Overcurrent Operation
Operation will be at 100 A and resetting at 90 A when the hysteresis (HYS.) is set to 10%.
3. Operating Time
The operating time is set using the operating time knob (T).
The operating time can be set to between 0.1 and 30 s.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the operating time.
If the input current exceeds (drops lower than) the current setting, the alarm indicator will start flashing for the set period and then stay lit.
4. Startup Lock Time
The startup lock time is set using the startup lock time knob (LOCK).
The startup lock time can be set to between 0 and 30 s.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes
(when the set value and the input have reached the same level.)
Use this as a guide to set the startup lock time.
The startup lock time will start when the input current reaches 30% or more of the current
setting.
Use startup lock time to prevent unwanted operation, e.g., as a result of inrush current.
Dimensions
Single-phase Current Relays
K8AB-AS1
K8AB-AS2
K8AB-AS3
OMRON CT
K8AC-CT200L
8
Single-phase Current Relay
22.5
9.3
9.3
1.7
1.7
4.7
11
63
Four M4 × 6 screws
54
50
8.5
6
57
14.5
14.5
86
5.2
10
10
1.8
4.1
5.9
76
K8AB-AS
Current setting
30% of current setting
Startup lock timer start
100
72
20
17
13.5
34.5
81.5
33.5
30 dia.
Note: The OMRON Current Transformer (CT) is
designed to be used with the K8AB-AS3.
20
Use terminals k and l for connections.
(Terminals kt and lt are not used.)
Inrush current
Startup lock time
There are no outputs
during this period.
(Unit: mm)
5
90
5
Mounting Hole Dimensions
Two M5 screw holes or
two 5.5-dia. holes
76
Cat. No. N142-E1-02
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