The Hirschmann RSP20-11003Z6ZT-SK9V9HSE2S is a managed DIN rail industrial Fast Ethernet switch within the RSP20 series combining four 10/100 Mbit/s copper RJ45 ports with seven SFP fibre slots, and uniquely accepting a wide-range AC/DC power input of 60–250 VDC or 110–230 VAC, making it the purpose-built choice for fibre-dominant substation and energy infrastructure networks that are natively powered from AC supply buses or high-voltage DC systems without requiring additional power conversion hardware. With seven SFP slots accepting single-mode, long-haul, and multi-mode fibre modules, this RSP20 variant enables expansive fibre ring, star, and mesh architectures across large substation yards, transmission infrastructure, and industrial campus environments where electrically isolated fibre connections are preferred over copper. Running HiOS Layer 2 firmware, the switch delivers PRP and HSR per IEC 62439-3, MRP per IEC 62439-2 in both manager and client roles, RSTP, and LACP for comprehensive high-availability redundancy. Advanced VLAN, QoS, IGMP snooping per VLAN, and jumbo frame support provide full traffic engineering capability, while PROFINET, EtherNet/IP, Modbus TCP, and IEC 61850 MMS server industrial protocol coverage ensures direct substation and automation platform interoperability. Security features include 802.1X, RADIUS, signed firmware images, VLAN-based ACLs, MAC-based port security, and audit trail logging. PTPv2 and 802.1AS time synchronisation supports precision timing. Certified to IEC 61850-3, IEEE 1613, CE, FCC, and EN61131 with a 60-month guarantee. Available from Recab, your Nordic partner for Hirschmann industrial switch solutions.