6.4
24 VDC power supply
Safety extra low voltage
WARNING
Power supply
The device is designed for operation with a directly connectable safety extra-low voltage
(SELV).
NOTICE
Suitable fusing for the power supply cables
The current on the terminal may not exceed 5 A. Use a fuse that protects against currents > 5 A.
The fuse must meet the following requirements:
• In areas where NEC or CEC applies:
– Suitable for DC (min. 60 V / max. 5 A)
– Breaking current at least 10 kA
– Approval according to ANSI/UL 248-1 or CSA C22.2 No. 248.1
– Classes R, J, L, T or CC
– Suitable for the protection of DC power supply circuits
• In other areas:
– Suitable for DC (min. 60 V / max. 5 A)
– Breaking current at least 10 kA
– Approval in compliance with IEC 60127-1 / EN 601127-1
– Switch off characteristics: B or C for circuit breakers and fuses
– Suitable for the protection of DC power supply circuits
You do not need to fuse the supply cable if you only use power sources with a limited power
source (LPS) or power sources according to NEC Class 2 for the power supply of the devices.
Connecting up
6.4 24 VDC power supply
SCALANCE XR-300WG
Operating Instructions, 03/2021, C79000-G8976-C454-07
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