Solutions
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.
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
Main-Tie-Main Configuration
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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.