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S8M

Digital Multicircuit Protector

S8M

Complete Flexible DC Circuit Protector That Has a Wide Array of Displays, Alarm Outputs, and Other Digital Functions.

Ratings/Characteristics

Model S8M-CP04 S8M-CP04-R S8M-CP04-RS
Number of branches 4
I/O
char-
acter-
istics
Rated input voltage 24 VDC (19.2 to 26.4 VDC)
Allowable input current 17.0 A max. 16.0 A max.
Maximum tripping output
current
(per branch output)
4.0 A 3.8 A
Internal voltage drop *1 0.5 VDC max. (at 4.0 A) 0.7 VDC max. (at 3.8 A)
Output leakage current 10 mA max.
Power
con-
sumption
*2
4 branches
output,
normal
operation
10 W max. (at 4.0 A) 15 W max. (at 3.8 A)
4 branches
output,
tripping
operation
3 W max.
Func-
tions
Tripping Abnormal
voltage
tripping
28.8 V (fixed), tripping alarm output
Abnormal
current
tripping
Setting range: 0.5 to 4.0 A (in 0.1-A
units), tripping alarm output
Setting range: 0.5 to 3.8 A (in
0.1-A units), tripping alarm output
Tripping
alarm output
Transistor output
30 VDC max., 50 mA max., leakage current: 0.1 mA max., residual voltage:
2 V max.
Alarms Overvoltage Setting range: 20.0 to 28.8 V (in 0.1-V units), alarm output
Undervoltage Setting range: 18.0 to 26.4 V (in 0.1-V units), alarm output
Overcurrent Setting range: 0.5 to 4.0 A (in 0.1-A
units), alarm output
Setting range: 0.5 to 3.8 A (in 0.1-A
units), alarm output
Run time Setting range: 0.0 to 99.9 kh (in 0.1-kh units), alarm output
(The alarm output is disabled if the time is set to 0.0 kh.)
Alarm output Transistor output
30 VDC max., 50 mA max., leakage current: 0.1 mA max., residual voltage:
2 V max.
Temper-
ature
Temperature Setting range: 25 to 80°C, over-temperature output
Over-
temperature
output
Transistor output
30 VDC max., 50 mA max., leakage current: 0.1 mA max., residual voltage:
2 V max.
Display Input voltage Display range: 17.0 to 30.0 V
Display accuracy: 2% rdg ±1 digit max.
Output
current
Branch output display range: 0.0 to 4.0 A
Peak output current display range:0.0 to 10.0 A
Total current display range: 0.0 to 40.0 A
Display accuracy: 5% FS (4 A) ±1 digit max.
Run time Display range: 0.0 to 99.9 kh
Display accuracy: 2% rdg ±1 digit max.
Temperature Display range: -10 to 100°C
Display accuracy: 2°C ±1 digit max.
External tripping input 19.2 to 30 VDC, minimum signal width: 10 ms, tripping within 20 ms of input
Startup sequence Can be enabled/disabled for each branch output, setting range: 0.0 to 99.9
s in 0.1-s units.
Shutdown sequence Can be enabled/disabled for each branch output, setting range: 0.0 to 99.9
s in 0.1-s units.
Communications None Supported (RS-232C)
Sampling period 1 ms
Other Ambient operating
temperature
Refer to the derating curve in Engineering Data (with no condensation or icing)
Storage temperature -25 to 65°C
Ambient operating
humidity
25% to 85% (storage humidity: 25% to 90%)
Dielectric strength 1.0 kVAC for 1 min (between all charged sections and all non-charged sections;
detection current: 20 mA)
500 VAC for 1 min (between all I/O and I/O signals/communications; detection
current: 20 mA)
500 VAC for 1 min (between all I/O signals and communications; detection
current: 20 mA)
500 VAC for 1 min (between input signals and all output signals; detection
current: 20 mA)
Insulation resistance 100 MΩ min. (between all charged sections and all non-charged sections)
at 500 VDC
100 MΩ min. (between all I/O and I/O signals/communications) at 500 VDC
100 MΩ min. (between all I/O signals and communications) at 500 VDC
100 MΩ min. (between input signals and all output signals) at 500 VDC
Vibration resistance 10 to 55 Hz, 0.375-mm single amplitude for 2 h each in X, Y, and Z directions
Shock resistance 150 m/s2, 3 times each in ±X, ±Y, and ±Z directions
EMI Conducted
Emission
Conforms to EN 61204-3 Class B
Radiated
Emission
Conforms to EN 61204-3 Class B
EMS Conforms to EN 61204-3 High severity levels
Approved
standards
UL: UL 508 (Listing), UL 60950-1 UL 508 (Listing, Class 2: Per UL
1310), UL60950-1
cUL: CSA C22.2 No. 107.1 CSA C22.2 No. 107.1 (Class 2:
Per No. 223)
cUR: CSA No. 60950-1 CSA No. 60950-1
EN/VDE: EN 50178 (= VDE 0160),
EN 60950-1 (= VDE 0805 Teil 1)
KOSHA S Mark
EN 50178 (= VDE 0160),
EN 60950-1 (= VDE 0805 Teil 1)
KOSHA S Mark
Weight 400 g max.

*1. A voltage drop will occur in the S8M. Consider the voltage drop at the output.
*2. When selecting the power supply, be sure to include the internal power consumption of the S8M (approx. 10 W) and
      not just the power consumption of the load.