SR750 | GE Multilin Feeder Management Relay | SR750 Series

Product Description

The GE Multilin SR750 Feeder Management Relay is a multifunctional protection and control device designed for electrical feeder applications in industrial and utility systems. The SR750 offers flexible configuration options for current inputs, power supply ranges, and analog outputs, making it adaptable to diverse installation requirements.

This relay provides comprehensive overcurrent, voltage, frequency, and directional protection functions, ensuring reliable feeder operation and system stability.

Technical Specifications

• Manufacturer: GE Multilin

• Model Options: SR750 or SR760

• Phase Current Inputs: 1 A or 5 A CT secondaries

• Ground Current Inputs: 1 A or 5 A

• Sensitive Ground Current Inputs: 1 A or 5 A

• Control Power (LO Range):

• DC: 20–60 V

• AC: 20–48 V @ 48–62 Hz

• Control Power (HI Range):

• DC: 88–300 V

• AC: 70–265 V @ 48–62 Hz

• Analog Outputs: Configurable (0–1 mA, 0–5 mA, 0–10 mA, 4–20 mA)

• Breaker Closed LED: Red or Green option

Protection Functions

• Phase timed overcurrent (51P) with voltage restraint (12 curves + 2 Flexcurves)

• Ground timed overcurrent (51N)

• Phase & ground low-set overcurrent (50PL, 50NL)

• Phase & ground high-set overcurrent (50PH, 50NH)

• Directional phase and ground control

• Zero sequence protection (67P)

• Negative sequence instantaneous (46/50) and time overcurrent (46/51)

• Voltage phase reversal (47)

• Negative sequence overvoltage (59Q)

• Under/overvoltage (27-1, 27-2, 59-1, 59-2)

• Under/overfrequency (81U-1, 81U-2, 81O-1, 81O-2)

Key Features

• Flexible input/output configuration for varied system requirements

• Wide-range power supply compatibility

• Advanced feeder protection with directional and sequence elements

• Designed for industrial-grade reliability

Application Scenarios

• Industrial feeder protection and monitoring

• Utility distribution systems requiring advanced relay functions

• Integration into SCADA and energy management platforms

FAQ

Q: Can the SR750 be configured for different CT ratings?  

A: Yes, it supports both 1 A and 5 A CT secondaries.

Q: What power supply ranges are available?  

A: LO range (20–60 VDC, 20–48 VAC) and HI range (88–300 VDC, 70–265 VAC).

Q: Does the SR750 provide frequency protection?  

A: Yes, it includes both underfrequency and overfrequency elements.