Connecting
6.4 Power supply
SCALANCE X-300
128 Operating Instructions, 02/2012, A5E01113043-12
6.4 Power supply
6.4.1 24 VDC power supply
6.4.1.1 24 VDC safety extra low voltage
24 V safety extra-low voltage (SELV)
WARNING
• The IE Switch X-300 is designed for operation with safety extra-low voltage (SELV).
This means that only safety extra-low voltages (SELV) complying with
IEC950/EN60950/ VDE0805 can be connected to the power supply terminals.
• The power supply unit for the IE Switch X-300 power supply must meet NEC Class 2, as
described by the National Electrical Code(r) (ANSI/NFPA 70).
• The power of all connected power supply units must total the equivalent of a power
source with limited power (LPS limited power source).
• If the device is connected to a redundant power supply (two separate power supplies),
both power supplies must meet these requirements.
• The signaling contact can be subjected to a maximum load of
100 mA (safety extra-low voltage (SELV), 24 V DC).
• Never operate the device with AC voltage or DC voltage higher than 32 V DC.
CAUTION
If IE Switches X-300 are supplied over long 24 V power supply lines or networks, measures
are necessary to prevent interference by strong electromagnetic pulses on the supply lines.
These can result, for example, due to lightning or switching of large inductive loads.
One of the tests used to attest the immunity of devices of the IE Switches X-300 to
electromagnetic interference was the "surge immunity test" according to EN61000-4-5. This
test requires overvoltage protection for the power supply lines (doe not apply to the
X-300EEC). A suitable device is, for example, the Dehn Blitzductor VT AD 24 V type no.
918 402 or comparable protective element.
Manufacturer: DEHN+SÖHNE GmbH+Co.KG, Hans Dehn Str. 1, Postfach 1640, D - 92306
Neumarkt, Germany.
Note
Cable outlet front or rear
There are devices with single (1 x 24 V) or redundant power supply (2 x 24 V). The cable
outlet can be to the front or rear on the device.
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