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The SEL-2730U withstands vibration, electrical surges, electrostatic discharge, fast transients, and extreme temperatures. It meets or exceeds IEEE 1613 (Class 1) and IEC 61850-3 standards for communications networking devices in electric power substations. The SEL-2730U drops no packets throughout this rigorous testing.Reliable Depend on reliability from SEL. Compare its superior specification compliance, lower price, and worldwide, ten-year product warranty to other industrial switches. Directly power the SEL-2730U from 24/48 Vdc or 125/250 Vdc or Vac; the observed power supply mean time between failures (MTBF) exceeds 2,000 years.*Simple Easily apply the unmanaged “no-settings” switch. Just connect power, Ethernet devices, and the fiber-optic Ethernet network. LED indicators simplify commissioning and solving network problems. Copper Ethernet ports automatically configure for crossover cables, speed, and half- or full-duplex operation.Safe Convert Ethernet links to fiber-optic Ethernet links. Use fiber-optic Ethernet links outside of cabinets for increased safety and electrical noise immunity.Flexible The base model SEL-2730U has 4 copper Gigabit Ethernet ports and 16 copper 10/100 Mbps Ethernet ports, built as 4-port modules. Each of the 10/100 Mbps copper port modules can be ordered as single- or multimode fiber-optic ports to meet the unique requirements of your network. In addition, up to 4 fiber-optic Gigabit Ethernet ports may be added via SFP transceivers, for a total of 24 ports.*This MTBF metric was calculated in December 2025.