Connecting
6.5 Power supply
SCALANCE X-300
Operating Instructions, 05/2016, A5E01113043-20
133
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)
M1
L2+ 24 V DC
24 VDC - product group X-300
Table 6- 2 24 to 48 VDC safety extra-low voltage overview
Device version
(power supply)
24 V safety extra-low voltage
(SELV)
can be connected redundantly
1 x 24 VDC ●
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