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SEL-FT50 and SEL-FR12

Fault Transmitter and Receiver System

The SEL-FT50 and SEL-FR12 system helps relays make better tripping and reclosing decisions based on the location of the fault. You can easily adapt it to your power system without interrupting service. The SEL-FT50 and SEL-FR12 system provides an innovative approach to enhance distribution substation protection and improve the reliability and safety of your feeder.

Starting At

SEL-FT50: $180 USD
SEL-FR12: $549 USD

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Block Reclosing for Underground Faults—It can be challenging to determine whether a fault has occurred on the overhead or underground section of a feeder. Traditionally, utilities have had to choose between the possibility of undesired reclosing into an underground fault or blocking reclosing for a close-in overhead fault when a high-current lockout is used. With the SEL-FT50 Fault Transmitter installed at the riser pole, the relay can receive fault status information before the first trip and know whether the fault is overhead or underground. The relay is then programmed to only allow reclosing when the SEL-FT50 signals that the fault is on the overhead portion of the feeder.

Fast Bus Tripping—Fast bus tripping schemes can provide an economical solution for substation bus protection on radial systems. However, in some cases, communication between relays may not be feasible or may be cost prohibitive. The SEL-FT50 and SEL-FR12 system installs easily on substation feeders, allowing protective relays to differentiate between a fault on the feeder and a fault on the bus with fast wireless communication to speed up bus protection.

Visual Overview

Block Reclosing for Underground Faults

FR12 Overview


Fast Bus Tripping

FT50 Fast Bus App


Easy to Deploy, Easy to Maintain
The lightweight design of the SEL-FT50 makes it easy to install by simply using a hot stick to clamp it to the overhead conductor. The SEL-FT50 is rated for voltages up to 38 kV and is completely line-powered, removing the need for battery maintenance.

Think Milliseconds, Not Seconds
The SEL-FR12 Fault Receiver can be paired with up to 12 line-powered SEL-FT50 Fault Transmitters. The SEL-FT50 broadcasts the status of faults via 900 MHz wireless signals to an SEL-FR12, which uses MIRRORED BITS communications to transmit the data to a protective relay—all in 6 ms!

FT50 Overview

Reduce Operation and Maintenance Costs
By identifying faults faster and shortening the duration of fault currents, the SEL-FT50 and SEL-FR12 system extends the life of equipment, reducing operation and maintenance costs.

The SEL-FT50 and SEL-FR12 system is approved for use by governments of the following countries:

  • Australia
  • Brazil
  • Canada
  • Colombia
  • European Union
  • New Zealand
  • Peru
  • United States

SEL recommends these parts to go with the SEL-FR12 receiver and SEL-FT50 transmitters for specific applications:

SEL-FR12 Recloser Control Accessory Kit

  • SEL-C968-50 Low-Loss LMR-400 N-to-N Connector, 50 ohm, 50 ft*
  • Omnidirectional Antenna
  • 240-0103 Vertical Omnidirectional Antenna Mount for up to 14" Diameter Pole

SEL-FR12 Substation Accessory Kit

  • SEL-C968-75 Low-Loss LMR-400 N-to-N Connector, 50 ohm, 75 ft*
  • SEL-C975-25 RG8-X BNC-to-N Connector, 50 ohm, 25 ft*
  • 200-2004 Radio Surge Protector With N Connectors
  • Omnidirectional Antenna
  • 240-0106 Mast Mount for Omnidirectional Antennas
  • SEL-93223XX 15 Vdc Power Supply

These parts are available as “recommended accessories.” When you use the Popular Model selector to choose a receiver or transmitter, the accessories are available in the second step of the process.

*Other cable lengths are available.


Customize Reclosing for Feeders—SEL-FT50 & SEL-FR12

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Customize Reclosing for Feeders—SEL-FT50 & SEL-FR12

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