Siemens 6GK5205-3BF00-2AB2 SCALANCE XB205-3LD 5-Port Managed Layer 2 Fiber Ethernet Switch

The Siemens SCALANCE 6GK5205-3BF00-2AB2 (XB205-3LD) is a managed Layer 2 PROFINET switch with five 10/100 Mbit/s RJ45 ports and three single-mode SC fiber ports (100BaseLX LD), certified to IEC 62443-4-2 for industrial cybersecurity. It runs on a redundant 24 V DC supply and supports PROFINET conformity class B with network load class III.

Technical Specifications

Certifications & Standards

• CE
• cULus
• KC
• RCM
• ATEX
• UKEX
• IECEx
• ULhazloc
• CCC
• FM

Selection Notes

The 6GK5205-3BF00-2AB2 pairs its RJ45 edge ports with single-mode SC fiber uplinks, so it fits segments that need to bridge a longer fiber backbone run into a copper device group without an extra media converter. Its IEC 62443-4-2 certification and RADIUS/802.1x support make it a candidate over an uncertified switch where network access control is part of the security concept. PROFINET conformity class B with network load class III positions it for standard cyclic traffic rather than the tighter isochronous timing of a class C switch, and the 257-VLAN ceiling covers most plant segmentation schemes without needing a chassis-class switch.

Applications

Control-room to field-level fiber backbones, machine networks bridging single-mode fiber runs to RJ45 device groups, and PROFINET segments where IEC 62443-4-2 network access control is required.