html{display:none} Arc-Flash Solutions | Schweitzer Engineering Laboratories

Arc-Flash Solutions

SEL combines light-sensing technology with fast overcurrent protection to provide high-speed arc-flash detection.


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. Combining these technologies allows high-speed tripping during arc-flash events without overtripping for external faults.

Arc-Flash Protection Advantages

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-851, SEL-751, and SEL-751A Feeder Protection Relays.

Smart Motor Control

Combine the power of SEL's motorMAX motor management solution with the safety of our integrated, secure arc-flash protection for improved plant safety and performance. motorMAX is a smart, centralized motor control system that gives you the information to make informed decisions about your processes. And the SEL-849 in motorMAX uniquely integrates arc-flash detection at no additional cost, providing overcurrent supervised arc-flash mitigation, which reduces incident energy in the affected area and reduces hazardous working conditions for personnel. In an arc-flash event, motorMAX can shorten out-of-service time, reduce equipment damage, and allow you to get back into service quickly.

Request a Follow-Up


Request a Follow-Up

SEL Arc-Flash Product Offerings

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.

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 communications 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.


Reduce Arc-Flash Hazards

motorMAX Arc-Flash Protection

System Components



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 support as well as options for arc-flash detection, differential protection, and synchronous motor protection.



The SEL-851 Feeder Protection Relay offers comprehensive current, voltage, and frequency protection along with arc-flash detection. Its simplicity and compact size make it ideal for utility and industrial low- and medium-voltage feeder protection.

751 LDM


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.



The SEL-751A Feeder Protection Relay is the right solution for industrial and utility feeder protection, with flexible I/O options, easy mounting, and fast settings.



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 short-circuit, load loss, load jam, and frequent-starting protection as well as imbalance-current and phase-reversal protection.



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-851, SEL-751 and SEL-751A relays and other arc-flash detection relays that use light and overcurrent to sense an arc-flash event.



The SEL-C804 Multimode Arc-Flash Detection Fiber-Optic Cable can be used with SEL-851, SEL-751, and SEL-751A relays to protect people and equipment from arc-flash events.



motorMAX is SEL’s smart motor control system for low-voltage motor control centers. This scalable system includes protective relays, managed network switches, Real-Time Automation Controllers (RTACs), precise time sources, and machine interfaces for local and remote visualization and control.


Documents sorted by newest first.


Sales Force Central access is required to view the content in this tab.

Sales Force Central