About these operating instructions
9
Indoor use
Devices with this symbol are intended solely for
indoor use.
SSwitched-mode power supply (electrical)
A switched-mode power supply converts an
unstable input voltage to a constant output
voltage.
Energy efficiency level VI
Energy efficiency levels are used to describe the
efficiency levels of internal and external power
supply units. Energy efficiency is sub-divided into
a number of categories, where Level VI is the most
efficient.
Transformer – short circuit proof
Transformer in which the temperature does
not exceed specified limits if the transformer
is overloaded or short-circuited, and which
continues to meet all the requirements contained
in the relevant standard once the overload or
short circuit has been rectified.
Protection class III
Electrical appliances in protection class III are
electrical appliances built for operation with
safety extra-low voltage that have neither internal
nor external electricity circuits which work with
a different voltage other than safety extra-low
voltage. The maximum rated voltage for the safety
extra-low voltage between the conductors and
between the conductors and the earth is 42 V.
