Key Benefits

The SR family of protection relays represents a microprocessor based and multi-functional line of products. By providing an economical system, protection, control, monitoring and metering, and both local and remote user interfaces in one assembly, the SR relays effectively eliminate the need for expensive discrete components.

• Best in class man machine interface (MMI) | Large backlit display with 40 characters to view relay information and settings in direct sunlight, full numerical keypad, and setpoint navigation keys. (Except 735/737)
• Accurate metering under sever system disturbances (750, 745 & 489) | Power system frequency tracking and adjusting sampling rate accordingly
• Minimize replacement time | Draw-out construction
• Improve uptime of auxiliary equipment | Through I/O monitoring
• Ease of use and installation | same front panel programming, common cutout (Except 735/737)
• Reduce troubleshooting time and maintenance costs | IRIG-B time synchronization, event reports, waveform capture, data logger (Except 735/737)
• Simplify testing | Built in simulation features and unique waveform play back functionality in the 745
• Cost Effective Access information | Via Modbus RTU and DNP 3.0 Level 2 protocols, through standard RS232, RS485 & RS422 serial ports, and optional Modbus RTU over TCP/IP through embedded Ethernet Port to connect to 10MB Ethernet local or wide area networks
• Complete asset monitoring | Analog I/O, metering including demand & energy (Except 735/737)
• Follow technology evolution | Flash memory for product field upgrade (Except 735/737 that requires an EEPROM replacement)
• Long lasting life | When exposed to chemically corrosive and humid environments with optional conformal coating (Except 735/737)