Instruction Manual

Intended Use of the Firefighter Safety Switch
The Firefighter Safety Switch (PEFS) has been especially developed as a safety device for
direct current (DC) photovoltaic installations. The DC disconnect switch is used to discon-
nect the connected strings of the installation in case of an emergency situation. Such an
emergency situation could be in case of fire.
Location of the Firefighter Safety Switch
The PEFS needs to be placed as close to the solar panels as possible. Due to its enclosure,
the switch is protected against external influences like dust and moisture. The whole set-up
is conforms to IP66 which makes it suitable for outdoor usage when needed.
Normal operation:
The PEFS will automatically switch to the off position, breaking the DC connection between
the solar panels and the inverter, after the AC power to the PEFS is interrupted for longer
than five seconds. The PEFS will automatically switch to the on position, restoring the DC
connection between the solar panels and the inverter, once the AC power to the PEFS is
restored longer than five seconds.
Special Operation
If the temperature inside the PEFS enclosure exceeds the 70℃, the PEFS will automatically
switch to OFF to protect the internal components and create a safe situation. When the
installation is checked and the PEFS is not affected, the PEFS can be switched ON again
by removal and re-applying the AC voltage to the PEFS. The PEFS will also automatically
switch to OFF if there is an internal failure. If this occurs please try to reset the PEFS by
removal and re-applying the AC voltage to the PEFS.
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2. The installation of these devices may only be performed by certified technical personnel.
3. The wiring schematics of the Firefighter Safety Switch can be found at the end of this
manual.
4. All the installation works should be tested in accordance with relevant local legislation at
the time of installation.