GE Multilin SR750-P5-G1-S1-HI-A20-R Feeder Management Relay

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Product Overview

GE Multilin SR750-P5-G1-S1-HI-A20-R is a high-performance microprocessor-based feeder management relay belonging to the famous 750/760 series. It is designed for primary protection, metering, monitoring, control and automation of medium-voltage distribution feeders for utility substations, power plants and industrial power distribution networks.

Model suffix breakdown:

• SR750: Feeder management relay series
• P5: 5 Amp phase CT secondary current input
• G1: 1 Amp ground fault CT input
• S1: 1 Amp sensitive ground fault CT input for high-impedance grounded system
• HI: High wide-range auxiliary control power supply
• A20: Four programmable 4–20 mA analog output channels
• R: Drawout removable chassis construction

This relay integrates full suite of feeder protection elements including phase overcurrent, directional overcurrent, ground fault, sensitive ground fault, breaker failure, over/under voltage, over/under frequency, negative sequence and thermal overload protection. It supports FlexLogic™ custom programmable logic, fault waveform capture, sequence of event recording and multi-protocol serial communication for SCADA/DCS integration. GE has discontinued the SR750 series. We supply surplus and fully refurbished SR750-P5-G1-S1-HI-A20-R spare parts for legacy substation feeder cabinet maintenance, avoiding costly full system retrofit.

Key Features

✅ Comprehensive feeder protection: phase overcurrent 50/51, directional overcurrent, ground fault, sensitive ground fault, breaker failure, voltage & frequency protection ✅ P5 5A phase CT secondary input, compatible with standard 5A phase current transformers widely used in distribution substations ✅ G1 1A ground CT + S1 1A sensitive ground CT for detection of low-level ground faults ✅ HI universal high-range control power: 70–265V AC / 90–300V DC, 48–62Hz ✅ A20 option: 4 isolated programmable 4–20mA analog outputs to transmit electrical parameters to DCS or PLC ✅ R drawout chassis: hot removable without disconnecting field wiring, greatly reduce maintenance outage time ✅ FlexLogic™ customizable programmable logic for feeder automation, load shedding and interlock schemes ✅ Event recorder & oscillographic fault waveform capture for post-fault diagnostics and root cause analysis ✅ Multi-port communication: RS232, RS485, Modbus RTU, DNP3.0, IRIG-B time synchronization ✅ Built-in power metering for kW, kVAR, kWh, power factor and demand monitoring

Technical Specifications

• Model: SR750-P5-G1-S1-HI-A20-R
• Brand: GE Multilin / GE Vernova / GE Grid Solutions
• Product Family: 750/760 Feeder Management Relay
• Phase CT Secondary Input: 5A (P5)
• Ground CT Input: 1A (G1)
• Sensitive Ground CT Input: 1A (S1)
• Control Power (HI): 70–265V AC, 90–300V DC, 48~62Hz
• Analog Output: 4 × 4~20mA (A20)
• Mounting: Panel mount, drawout chassis (R)
• Operating Temperature: -40℃ ~ +70℃
• Humidity: 5% ~95% RH, non-condensing
• Protection Rating: Front IP54, rear IP30
• Certifications: CE, UL, IEC 60255

Applications

GE Multilin SR750-P5-G1-S1-HI-A20-R relays are widely deployed for medium voltage distribution feeder protection:

• Utility substation distribution feeders
• Power plant auxiliary medium voltage feeders
• Large industrial plant main distribution feeders
• Oil & gas plant power distribution feeders
• Mining heavy industry medium voltage feeders
• Backup protection for busbars, small transformers and short transmission lines
• Replacement spare parts for legacy GE SR750 feeder protection panels

Product Supply Information

We provide fully tested GE Multilin SR750-P5-G1-S1-HI-A20-R feeder management relays for global power and automation buyers. The SR750 series is discontinued by GE. Available stock includes surplus and refurbished units.

• Complete functional, protection logic and communication testing before shipment
• 12-month warranty
• Anti-static packaging, secure export carton
• Shipping options: DHL, FedEx, UPS, sea freight
• Trade terms: EXW, FOB, CIF, DDP

FAQ

Q1: What does -P5-G1-S1-HI-A20-R suffix mean?

A: P5=5A phase CT secondary; G1=1A ground CT; S1=1A sensitive ground CT; HI=high wide-range control power; A20=four 4–20mA analog outputs; R=drawout removable chassis.

Q2: Is discontinued?

A: Yes, GE Multilin has phased out the 750 feeder relay series. We supply surplus and fully tested replacement units for legacy feeder protection systems maintenance.

Q3: What is the difference between G1 and S1 for SR750?

A: G1 = standard ground fault CT input; S1 = sensitive ground fault CT input, used to detect low magnitude leakage ground faults in high impedance grounded distribution systems.

Q4: What is the advantage of R drawout chassis?

A: Drawout design allows technicians to extract relay unit for maintenance, testing or replacement without removing field wiring, minimizing substation downtime.

Q5: What communication protocols does SR750-P5-G1-S1-HI-A20-R support?

A: RS485 Modbus RTU, DNP3.0, RS232, plus IRIG-B time synchronization for accurate event timestamping.

GE BRAND

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