Hirschmann 943434008 RS20-0400T1T1SDAP Managed Switch with 4 RJ45 Fast Copper ports (with 2 of copper ports are uplink ports). Operating Voltage of 12-48 VDC and 24 VAC with store and forward switching mode. Software Layer 2 Professional and fanless design with Professional management. DIN rail mount. Operating Temperature of 32F-140F. Approvals CE, cUL508, ISA12.12.01, Class 1 Div 2. RS20 Managed switches with hardened products designed to tolerate and thrive in the environments of modern manufacturing plants Broad portfolio to allow optimal component selection in changing applications Full featured management suite including VLAN's, IGMP Snooping at Layer 2, Rapid Spanning Tree, integrated DHCP server capabilities, SNMP management and multiple security options The ability to remotely reach, program and monitor the network to support overseas installations In the unlikely event of a component failure, an easy, fast and foolproof method of installing a replacement part to working order within minutes. Strong, global support from an established industry leader.