Connecting
6.4 Power supply
SCALANCE X-300
Operating Instructions, 10/2010, A5E01113043-10
125
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
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.
● The power supply is connected over a high resistance with the enclosure to allow an
ungrounded set up. The two power inputs are non-floating.
Terminal block assignment (4-pin)
Table 6- 1 Pinout of the 24 V safety extra-low voltage (SELV)
Pin number Assignment Labeling (example)
Pin 1 L1+ 24 V DC
Pin 2 M1
Pin 3 M2
Pin 4 L2+ 24 V DC
6.4.1.2 Safety extra low voltage
Table 6- 2 Power supply for a SCALANCE X-300
Type 24 V safety extra-low voltage (SELV), redundant
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 ●
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