S8AS
Engineering Data
Extended Detection
Derating Curve
Time
(ms)
120
Setting
range
Tripping region
Current-
limiting by
internal
circuits
100
80
1
1,000
60
60
20
40
0.5
3.8
11 16 19
Branch output (A)
20
0
−20 −10
0
10 20 30 40 50 60 70 80
Ambient temperature (°C)
Tripping Performance
The S8AS detects the current of branch outputs as digital values and
numeric processing is performed to execute cutoff operations.
Refer to Abnormal Current Tripping for the tripping performance. The
following cutoff functions are also provided.
Note: 1. Internal parts may occasionally be deteriorated or
damaged. Do not use the S8AS in areas outside the
derating curve (i.e., in the area shown by shading A in the
above graph).
2. Use forced cooling if necessary to satisfy the derating curve.
3. For 480-W models, reduce the load to 80% or less for long-
term use at an input voltage of 95 VAC or less.
Judgment Type Selection
Standard, instantaneous, or extended can be set as the method for
detecting the tripping current. With the S8AS-24006N/48008N, only
the extended detection is supported. Refer to the S8AS User's
Manual (Cat. No. Z269) for the setting method.
Abnormal Current Tripping
Standard Detection
Current Limit
Time
(ms)
This function is provided to limit excessive short currents, such as
those that can flow for equipment short faults.
Setting
range
Current-
limiting by
internal
circuits
Tripping region
Startup Delay
This function is provided to disable cutoff operations for 40 ms after
the branch outputs turn ON so that cutoff operations will not occur for
large inrush currents.
100
Safety Circuits
60
20
Temperature fuses and current fuses are provided for each branch
output to ensure safety even in the unusual event of an internal
failure.
0.5
3.8
11 16 19
Branch output (A)
Mounting
Instantaneous Detection
Standard Mounting
Face-up Mounting
Time
(ms)
S8AS-24006
POWER SUPPL
Y
A(-)
B(+)
RS485
1
2
3
4
5
6
V
A
Yrs°C
5
s
L
N
INPUT
50/60Hz AC100-240V 3.8A
Setting
range
1
2
3
4
6
Current-
limiting by
internal
circuits
Class2
OUTPUT
DC 24V 3.8A
+V
-V
-V
+
1
+
2
+
3
+
4
+
5
+ 6
DC ON
V.ADJ
Tripping region
TRG
TRP LOW LFE TMP COM
-
1
-
2
-
3
-
4
-
5
- 6
+
-
Note: 1. The above illustration shows a 240-W model.
2. Poor heat dissipation resulting from improper installation
conditions may occasionally deteriorate or damage internal
parts and also cause the maintenance forecast monitor
function to not operate properly. Do not use any mounting
orientation other than a standard one.
20
0.5
3.8
19
Branch output (A)
Inrush Current, Startup Time, Output Hold Time
Input ON
Input OFF
AC input
voltage
Inrush current on input application
AC input
current
96.5%
90%
Output
voltage
Startup time (3,000 ms max.)
Hold time (20 ms min.)
8