Safety Extra Low Voltage - Siemens SCALANCE X-300 Manual

Connecting 24 V safety extra-low voltage (SELV)
● The power supply is connected using a 4-pin plug-in terminal block.
● The power supply can be connected redundantly. Both inputs are isolated. There is no
● The power supply is connected over a high resistance with the enclosure to allow an
Terminal block assignment (4-pin)
Table 6- 1 Pinout of the 24 V safety extra-low voltage (SELV)
Pin number
Pin 1
Pin 2
Pin 3
Pin 4
6.4.1.2

Safety extra low voltage

Table 6- 2 Power supply for a SCALANCE X-300
Type
X304-2FE
X306-1LD FE
X307-3
X307-3LD
X308-2
X308-2LD
X308-2LH
X308-2LH+
X310
X310FE
X320-1 FE
X320-3LD FE
SCALANCE X-300
Operating Instructions, 10/2010, A5E01113043-10
distribution of load. When a redundant power supply is used, the power supply unit with
the higher output voltage supplies the IE Switch X-300 alone.
ungrounded set up. The two power inputs are non-floating.
Assignment
L1+ 24 V DC
M1
M2
L2+ 24 V DC
24 V safety extra-low voltage (SELV), redundant
6.4 Power supply
Labeling (example)
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Connecting
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