Products

SEL provides reliable finished (terminated) cables, built to IPC workmanship standards in our ISO 9001 certified plants – And, they are covered by our worldwide, ten-year warranty. A variety of standard and customized twisted pair and coaxial cables and connector combinations are available from SEL.

Overhead AutoRANGER Fault Indicators are self-adjusting fault indicators for overhead lines. You can apply the SEL-AR360 on distribution systems up to 35 kV and the SEL-AR on systems up to 69 kV for permanent and momentary fault indication using bright LEDs and flash patterns.

Economical timed-reset fault indicator eliminates false reset concerns.

Select your trip value in the field. Stock one fault indicator for a variety of system conditions.

Load current-powered faulted circuit indicator (FCI) with no minimum voltage requirement provides a solution for low-voltage applications.

Battery-free automatic reset fault indicator provides maintenance-free fault indication.

Troubleshoot problematic sections of overhead systems.

Find faults faster on urban systems with the SEL-PILC Fault Indicator.

This distribution automation sensor stores load data and monitors the distribution line for loss of current or fault events. Reports are transmitted to an access point on a communications network using an integrated radio.

Select the SEL-321-5 for 50 Hz applications requiring enhanced single-pole tripping, phase and ground distance, directional overcurrent, and negative-sequence protection.

The SEL-351 Relay 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.

The SEL-351A Protection System has built-in Ethernet and IEEE C37.118 synchrophasors, and is the economical solution for overcurrent protection. Easy-to-use feeder protection and innovative features like SEL’s Best Choice Ground Directional Element logic and SELogic control equations provide superior protection on utility and industrial power systems.

Protect and control any two-, three-, or four-winding power transformer with the SEL-387, which provides thermal and through-fault monitoring, and with SELogic Control Equations, can detect breaker failure.

Apply the SEL-387A to protect any two-winding power transformer and perform predictive maintenance based on accumulated through-fault duty (as compared to transformer capability as defined in ANSI Standard C57.109).

Provide low-impedance bus differential protection, dynamic zone configuration, circuit breaker failure protection, backup overcurrent protection, check zones and voltage inputs for increased security.

Simplify protection in two-high switchgear with two independent sets of protection elements in one compact relay.

The SEL-551 Overcurrent/Reclosing Relay replaces the many relays, control switches, and wiring required in traditional distribution substation protection and control panels. The relay also replaces line recloser control packages at a fraction of the cost.

The SEL-551C Overcurrent/Reclosing Relay combines overcurrent protection, built-in I/O, enhanced communications features, and multiple-shot reclosing in one compact relay. Great for industrial, commercial, and utility, primary or secondary overcurrent protection.

Provide single-zone high-impedance bus differential protection, backup overcurrent protection, and breaker failure protection for any number of terminals in a bus. Use the simple settings and dedicated same-ratio CTs to create a cost-effective and easily expandable bus protection solution.

The SEL-751 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 offers industrial and utility feeder protection with flexible I/O options, easy retrofit, and fast setup and configuration. The SEL-751A provides complete feeder protection with overcurrent, voltage, and frequency elements. The SEL-751A remediates arc-flash hazards with arc-flash detection.

Provide complete current differential and overcurrent protection for three- and four-winding transformers. Select the SEL-787-3E or SEL-787-3S for current- and voltage-based protection on three-terminal transformers, and choose the SEL-787-4X for current differential and overcurrent-based protection on four-winding transformers.

With an MTBF of 10x over other industrial computers and 10-year warranty, SEL computers are reliable and withstand –40°C to +75°C. Quality and service are what we have built our name on. Our computers are built to the same tough standards as our protective relays.

The Axion is a fully integrated, modular I/O and control solution suitable for many utility and industrial applications. It combines the communications, built-in security, and IEC 61131 logic engine of the SEL Real-Time Automation Controller (RTAC) product line with a durable suite of I/O modules that provide high-speed, deterministic control performance over an Ethernet network.

Protect high-impedance grounded generators from ground faults at standstill, during startup, and while running with the multisine frequency injection and neutral overvoltage-based protection in the SEL-2664S.

With an MTBF of 10x over other industrial computers and a 10-year warranty, SEL computers are reliable and withstand temperatures from –40°C to +75°C. 

Send delay-compensated demodulated IRIG-B up to 4 km over fiber-optic cable with SEL-3405 High-Accuracy IRIG-B Fiber-Optic Transceivers.

The SEL-4520 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 for sensing an arc-flash event.

Decrease maintenance costs, increase contact reliability/dependability, and reduce destructive dc circuit overvoltages by applying the self-powered SEL-9501 Arc Suppressor to dc circuits.