View Arc-Flash Simulation
An arc-flash event can occur any time there is an electrical fault in the air with sufficient voltage and available fault current.
Reduce Arc-Flash Energy 
Use instantaneous elements during maintenance. Fast trip times limit available arc-flash energy, reducing danger of injury or damage.
View Arc-Flash Test Videos 
A series of tests were performed at a high-current test laboratory to demonstrate that the SEL-751A can detect the onset of an arc-flash event.
Coordinate Protection 
Use SEL Mirrored Bits® communnications to coordinate upstream protection if a fault occurs. Coordination and fast bus trip schemes allow short delays (two to three cycles) for backup protection, reducing arc-flash energy.
Flexible Installation 
Install into new switchgear, or retrofit into existing equipment with optional mounting kits. Upgrade your SEL-751A Relays with a field-installable arc-flash detection upgrade kit.
High-Speed Detection 
Innovative fiber-optic light sensing and overcurrent protection detect arc-flash hazards and send a trip signal to the breaker in as fast as 2 ms.
Substation-Hardened Ethernet 
The SEL-751A withstands electrostatic air discharge of 15 kV and communicates via Modbus TCP, DNP3 LAN/WAN, Telnet, FTP, and IEC 61850.
Industry-Leading Quality, Reliability and Service 
SEL products operate in a temperature range of -40º to +85º C and are backed by our ten-year worldwide warranty.