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Motor Protection

Motor Protection

SEL understands how critical it is to provide continuous, reliable motor protection. That is why SEL offers industry-leading products with the most extensive warranty. SEL motor protection relays give customers a custom-fit motor protection system with easy installation for both retrofit and new applications.

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Advantages of SEL Motor Protection

  • SEL products lead the industry with the highest mean time between failures (MTBF) (over 300 years).
  • Ten-year warranty and best-in-class technical support.
  • Easy application covering most protection functions. Low base prices with optional motor protection application add-in cards.

SEL Motor Bus Transfer

Preserve Process Reliability With Multifunction Bus Transfer

Industrial facilities with critical processes require a reliable supply of electric power and typically have two incoming sources. To ensure process continuity during a fault to the primary feeder, the SEL-700BT Motor Bus Transfer Relay quickly and safely transfers loads to an auxiliary feeder. This functionality keeps processes running without requiring a cold start, helps avoid costly shutdowns, provides personnel safety, and helps avoid environmental damage. A single SEL-700BT can protect and control a critical main-main load bus by selecting from two sources automatically, and two SEL-700BT relays (one on each side of the intertie) can transfer the load bus between sources in a main-tie-main configuration.

Main-Main Configuration

700BT App-2

Main-Tie-Main Configuration

700BT App-3


Reduce Arc-Flash Hazards

System Components


SEL-700BT Motor Bus Transfer Relay

The SEL-700BT is an effective solution for an industrial motor bus transfer system, with multiple source transfer algorithms, flexible I/O, and advanced communications. It ensures process continuity by transferring critical loads from a primary source to an auxiliary feeder during faults in the primary feeder line. The relay allows automatic motor bus transfers using fast, in-phase, residual, and fixed-time methods to keep processes running without requiring a cold start. It is also possible to manually transfer load locally or remotely via communications.


SEL-710-5 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. The synchronous option also includes, at no additional cost, a voltage divider accessory to interface with the motor excitation system. Together with the industry’s best AccuTrack Thermal Model, these new features combine to provide a great solution for all of your motor protection applications.


SEL-849 Motor Management Relay

The SEL-849 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:

  • Short circuit
  • Load loss
  • Load jam
  • Frequent starting
  • Imbalanced current
  • Phase reversal

The SEL-849 installs easily inside a motor control center (MCC). The optional SEL-3421 and SEL-3422 Motor Relay HMIs (human-machine interfaces) install on the front of the MCC.


SEL-2600 RTD Module

Measure and transmit data from up to 12 RTDs and a single contact status located in transformers, breakers, motors, generators, or other system apparatus.


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