xii
■ Operating the S8M
Unlike ordinary mechanical circuit protectors, the S8M does not have contacts for switching. The S8M uses
semiconductor relays to switch the circuits ON/OFF and cut off the outputs. Read and understand the following
features before operating the S8M.
■ Installation and Storage Environment
1. Store the Product at an ambient temperature of –25 to 65°C and relative humidity of 25% to 90%.
2. Poor heat dissipation resulting from improper installation conditions may occasionally deteriorate or
damage internal parts. Do not use any mounting method other than a standard one.
3. Internal parts may occasionally be deteriorated or broken. Do not use the Product in conditions exceeding
the derating (in portion (1) of the derating curve).
4. The surrounding air temperature for UL 508 listing and UL 60950-1 recognition is 50°C.
5. Use the Product where the relative humidity is 25% to 85%.
6. Do not use the Product where it would be subjected to direct sunlight.
7. Do not use the Product where it would be subjected to the possibility of penetration of liquid, foreign
substance, or corrosive gas.
8. Do not use the Product where it would be subjected to shock or vibration. A device such as a contact
breaker may be a vibration source. Install the Product as far as possible from external devices.
Additionally, install a PFP-M End Plate on each side of the Product.
9. If the Product is used in an area with excessive electronic noise, be sure to separate the Product as far as
possible from the noise sources.
10. Tripping performance depends on the ambient operating temperature. Use the Product within the derating
curve (page xiii).
■ Wiring
• Minor electric shock during operation may occasionally occur. Always attach the terminal cover when
using the S8M.
• Minor fire may possibly occur. Ensure that input and output terminals are wired correctly.
• Increases in the temperature of internal parts resulting from heating of wiring materials may result in
deterioration or damage to internal parts. Use wiring materials suitable to the current being used. The
following wiring materials, torque, and strip length are recommended to prevent heating and possible fires
in wiring materials.
Recommended Wire Types
• It is conceivable that internal parts may be deteriorated or damaged. Do not repeatedly perform tripping or
recovery operations more than necessary.
• Do not apply more than 100 N force to the terminal block when tightening screws.
• Be sure to remove the sheet covering the Product for machining before power-ON so that it does not
interfere with heat dissipation.
• The S8M takes a DC power input. Do not connect AC power to the power input terminals.
Precautions for Safe Use
Terminals Wiring materials Torque Strip length
Power input terminals
AWG14 (2.081 mm
2
) × 2
Solid,
Stranded
1.08 N·m (9.6 in. lb.) 8 to 10 mm
Branch output terminals AWG16 to 20
(1.309 to 0.517 mm
2
)
0.8 to 1.0 N·m (7.2 to 8.8 in. lb.) 6 to 7 mm
Other terminals AWG18 to 26
(0.823 to 0.129 mm
2
)
--- 10 mm
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