The Hirschmann 933 406-100 is a RS20 Industrial Ethernet switch with 8 Fast Ethernet ports and 2 Gigabit/SFP ports. It features redundant power inputs and supports a variety of communication protocols, making it ideal for a wide range of industrial applications. It also has a built-in Web interface, allowing users to configure and monitor the device via web browsers. Additionally, it includes a range of advanced network security functions including port-level access control, protection against DoS and DDoS attacks, support for SNMP v3, and non-blocking switching behavior.