Project Description

Reduce Arc-Flash Hazards




SEL arc-flash detection technology significantly decreases the time it takes a relay to trip in response to an arc fault, which reduces hazardous arc‑flash incident energy. SEL combines light-sensing technology with fast overcurrent protection to provide high-speed arc-flash detection (AFD). Combining these technologies allows high‑speed tripping during arc‑flash events without overtripping for external faults.

SEL’s cost‑effective arc‑flash detection technology reduces arc‑flash‑related equipment damage for standard and arc‑resistant switchgear in medium- and low-voltage applications. Arc‑flash detection comes standard in the SEL‑849 Motor Management Relay and is available as an option for the SEL-710-5 Motor Protection Relay, as well as the SEL‑751 and SEL‑751A Feeder Protection Relays.

High-Speed Detection

Arc-flash light sensing and overcurrent protection detect arc‑flash hazards and send a trip signal to the breaker in as fast as 2 ms.

Arc-Flash High Speed Detection

Reduced Damage to Switchgear

With arc-flash hazard protection, equipment damage is minimized during an arc‑flash event, returning affected equipment to service faster and maximizing power system availability.

Coordinated Protection

Use SEL Mirrored Bits® or IEC 61850 GOOSE messaging to coordinate upstream protection if a fault occurs. In some situations, it is necessary to send a transfer trip signal to an upstream breaker relay to clear an arc fault.

Flexible Installation

Install into new switchgear or motor control centers. Retrofit into existing equipment with optional mounting kits. Upgrade your SEL‑751 Relays with a field-installable arc-flash detection upgrade kit.

Substation Ethernet

The SEL‑751A withstands electrostatic air discharge of 15 kV and communicates via Modbus® TCP, DNP3 LAN/WAN, Telnet, FTP, and IEC 61850.

Quality, Reliability, and Service

SEL products operate in a temperature range of –40º to +85ºC and are backed by our ten-year, worldwide warranty.

Related Products

SEL-751/SEL-751A Feeder Protection Relay

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The SEL-751 Feeder Protection Relay is ideal for directional overcurrent, fault location, arc-flash detection, and high-impedance fault detection applications. Flexible I/O options, easy mounting, and fast settings make the SEL-751 the right solution for industrial and utility feeder protection.

SEL-710-5/SEL-710 Motor Protection Relay


Protect asynchronous (induction) and synchronous motors with one SEL-710-5 Motor Protection Relay. New features include broken rotor bar detection and variable-frequency drive (VFD) support as well as options for arc-flash detection, differential protection, and synchronous motor protection.

SEL-849 Motor Management Relay


The SEL-849 Motor Management Relay offers current-, voltage-, and thermal-based motor protection; arc-flash detection; and power metering. It also provides all basic motor protection features, including protection for the following conditions:

SEL-4520 Arc-Flash Test Module


The SEL-4520 Arc-Flash Test Module provides a convenient way to test the operation of arc-flash detection relays installed in metal-clad and metal-enclosed switchgear. The SEL-4520 is used to test the SEL-751 and SEL-751A Feeder Protection Relays and other arc-flash detection relays that use light and overcurrent to sense an arc-flash event.