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SEL-421 Distance Relay

Apply the SEL-421 Protection, Automation, and Control System for high-speed distance and directional protection and complete control of a two-breaker bay. Protect any transmission line using a combination of five zones of phase- and ground-distance and directional overcurrent elements.

SEL-311L Line Current Differential Protection

Use the SEL-311L Line Current Differential Relay with integral four zone distance backup for easy-to-apply, high-speed line protection. Apply subcycle current differential protection with included four zone distance and directional overcurrent backup. Use single or dual differential channels for reliability.

SEL-387L Line Current Differential Relay

Use SEL-387L Line Current Differential Relays for economical, easy-to-apply line protection.

SEL-311C Transmission Protection System

Apply the SEL-311C Relay for protection, reclosing, monitoring, and control of transmission lines. Features include a four-shot recloser, patented capacitance voltage transformer (CVT) transient overreach logic to enhance security of Zone 1 distance elements, and overcurrent elements.

Recloser Control Products

Recloser controls are the front line of the distribution power system, often located in distribution substations or on feeders, recloser controls supply the intelligence to allow reconfiguration of distribution systems and maintain reliable service to as many people as possible in the event of a fault.

SEL-351R Recloser Control

The SEL-351R Recloser Control, derived from SEL’s premiere distribution relay, the SEL-351 Protection System, combines traditional recloser control functions with technologically advanced SEL relaying features, such as phase and ground directional elements, multilevel under- and overfrequency trip and control, and high-accuracy metering.

SEL-651R Advanced Recloser Control

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Apply the easy-to-use SEL-651R Advanced Recloser Control for Automatic Network Reconfiguration, three-phase and single-phase tripping, and all your distribution automation needs.

Feeder Protection Products

Feeder products protect the distribution systems for utility, industrial, and commercial power systems world wide. The versatile and easy to use protection these products offer make them ideal for other applications such as overcurrent backup protection, automation, and control of advanced protection schemes.

SEL-351/SEL-351A Protection System

The SEL-351 Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is ideal for directional overcurrent applications. Optional MIRRORED BITS® communications and power quality monitoring add flexibility to solutions. The SEL-351 is the protection standard for utility and industrial electrical systems around the world.

SEL-451 Protection, Automation, and Bay Control System

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The new SEL-451 is a complete stand-alone protection, automation, and control system. The SEL-451 has speed, power, and flexibility to combine complete substation bay control with high-speed breaker protection in one economical system.