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■ Installation
• Mounting Direction
Always install the S8M on a DIN Rail. For details, refer to 3-2 Installation.
• Mounting Space
The long-term reliability of the S8M can be increased by installing it properly and sufficiently considering
heat dissipation. Install the S8M so that the air flow circulates around it, because the S8M is designed to
radiate heat by means of natural air circulation.
Although two or more S8M Multicircuit Protectors can be installed side by side, they must be separated
from sources of heat, such as the switching power supply installed to the input side, by the distances
given in 3-1 Installation Environment.
■ Input Voltage
Input voltage range: 19.2 to 26.4 VDC
• The S8M provides abnormal voltage protection. All branch outputs will be cut off if the input voltage exceeds
28.8 VDC. This function, however, does not protect loads and internal parts from high voltages in all cases.
Be sure the input voltage is within the rated range.
• Outputs may be cut off by the abnormal voltage protection with loads that generate reverse peak electro-
motive force.
• A voltage drop occurs within the S8M. Be sure to consider the effect of the voltage drop on the output
voltage.
■ Input Power Supply Selection
• When selecting a power supply, be sure to add the S8M’s internal power consumption (about 10 W) to the
power consumption of the loads.
• The overcurrent protection characteristics of the power supply connected to the input side can cause a
voltage drop, possibly resulting in a cutoff.
• If the capacity of the input power supply is too small compared with the load, the overcurrent protection
characteristics of the power supply can prevent the S8M from starting or can cause a voltage drop, possibly
resulting in a cutoff.
• If secondary voltage of the power supply rises or falls too slowly, the overcurrent protection characteristics of
the power supply can prevent the S8M from starting or can cause a voltage drop, possibly resulting in a
cutoff.
■ Tripping Performance
There are two tripping types that can be used to detect output current characteristics: Standard detection
(overcurrents lasting 80 ms are cutoff within 100 ms) and Instantaneous detection (overcurrents lasting 20 ms
are cutoff within 10 ms). Set the best tripping output current characteristics.
• If the S8M is tripped, always remove the cause first and then reset the S8M.
• If using a load with a fixed power operation, a cutoff may occur when the power supply is turned OFF.
• The accuracy of the tripping current is ±0.3 A.
Precautions for Correct Use
Standard horizontal mounting OK
Upward-facing mounting Incorrect
Other mounting directions Incorrect
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