Note
Device variants
There are devices with one power supply unit or with two power supply units. Depending on the
variant, the data cable outlet can be on the front or at the rear of the device.
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
6.6.1.2 X-300 product group
Table 6-2 24 to 48 VDC safety extra-low voltage overview
Device Device version
(power supply)
24 V safety extra-low voltage (SELV)
can be connected redundantly
X304-2FE 1 x 24 VDC ●
X306-1LD FE 1 x 24 VDC ●
X307-3 1 x 24 VDC ●
X307-3LD 1 x 24 VDC ●
X308-2 1 x 24 VDC ●
X308-2LD 1 x 24 VDC ●
Connecting
6.6 Power supply
SCALANCE X-300
Operating Instructions, 11/2019, A5E01113043-24 129
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