Connecting up
5.5 Power supply
SCALANCE XR-300M PoE
Compact Operating Instructions, 05/2016, A5E02661178-10
49
5.5.2
Connecting devices with 24 VDC power supply
5.5.2.1
24 VDC - XR-300M PoE product group
Table 5- 2
24 VDC safety extra-low voltage overview
Device
Device version (power supply) 24 V safety extra-low voltage
(SELV)
can be connected redundantly
XR324-4M PoE
1 x 24 VDC
●
1 x 24 VDC
●
See also
Connecting devices with 100 to 240 VAC power supply (Page 51)
5.5.2.2
Connecting the external 24 VDC power supply
24 V safety extra-low voltage (SELV)
WARNING
Safety extra low voltage
The equipment is designed for operation with a directly connected safety extra-low voltage
(SELV). (This does not apply to 100 V to 240 V devices.)
The maximum current via the 24 V terminals is 8 A. You should therefore include a fuse
that trips at a current higher than 8 A. The fuse must meet the following requirements:
•
Suitable for DC (min. 60 V / max. 8 A)
•
Breaking current at least 10 kA
•
UL/CSA listed (UL 248-1 / CSA 22.2 No. 248.1)
•
Classes R, J, L, T or CC
As an alternative, the following requirements:
•
Suitable for DC (min. 60 V / max. 8 A)
•
Breaking current at least 10 kA
•
Approved in compliance with IEC 60127-1 / EN 60127-1
•
Breaking characteristics: B or C for a circuit breaker or slow-blow fuse