Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Key Technical Specifications
| Parameter | Value |
|---|---|
| CT Input Configuration | P5=5A phase, G5=5A ground, S5=5A sensitive ground |
| Control Power Supply (HI) | 88–300 VDC, 85–265 VAC, 48–62 Hz |
| Communication | RS485, Modbus RTU, DNP3.0 |
| Protection Elements | Phase overcurrent, ground fault, sensitive ground, over/under voltage, over/under frequency |
| Data Recording | COMTRADE waveform capture, sequence of events, fault records |
| Logic Engine | FlexLogic programmable scheme logic |
| Form Factor | Drawout panel mount case |
| Operating Temperature | −40°C to +70°C |
| Metering Functions | Current, voltage, power, power factor, energy, harmonics |
| ANSI Support | 50, 51, 51N, 59, 27, 81, 50G, 50SG |
| Order Suffix A20 | Standard feature set, no extra hardware options |
Product Introduction
The GE SR750-P5-G5-S5-HI-A20-R is a microprocessor-based feeder management relay built for medium voltage distribution feeders. It samples current and voltage waveforms continuously to trigger trip, reclose, and alarm logic for fault events.This unit replaces multiple discrete electromechanical relays in one drawout housing. It logs fault waveforms and event timestamps, so maintenance teams can isolate root cause without adding separate fault recording hardware.
SR750-P5-G5-S5-HI-A20-R
SR750-P5-G5-S5-HI-A20-R
SR750-P5-G5-S5-HI-A20-R
SR750-P5-G5-S5-HI-A20-R
Application Scenarios & Field Experience
Many older distribution sites still rely on legacy relays that cannot record faults or communicate to SCADA. A failed feeder relay forces full manual lockout and leaves no trace of what caused the trip.
- Industrial substation: Incoming medium-voltage feeder protection for a chemical plant, with sensitive ground fault detection for cable insulation breakdown.
- Utility distribution: Radial feeder protection with automatic reclosing for overhead lines serving residential load centers.
- Solar collection substation: Collector circuit protection, frequency and voltage ride-through monitoring for inverter interconnection.
- Data center switchgear: Backup protection for bus sections, load-shedding logic for critical bus transfer schemes.
In my experience, a food processing plant lost one SR750 unit after a lightning strike induced a surge on the control wiring. The replacement matched the exact P5-G5-S5-HI-A20-R configuration, and the technician cloned the settings file over the front port. Feeder service returned in 32 minutes, and no downstream MCC or motor damage occurred.
Standard Operating Procedure (SOP) for Quality Control
- Visual & Origin Inspection: Check front overlay, serial number, OEM labels, and drawout connector pins; screen for counterfeit markings.
- Live Rig Testing: Apply simulated CT and VT signals, verify overcurrent pickup, trip output, and RS485 communication handshake.
- Firmware Verification: Read and record firmware revision and setpoint file checksum; attach this record to the test certificate.
- ESD-Safe Packaging: Secure relay in anti-static bag, use foam padding for drawout contacts, mark outer carton with ESD warning labels.
Frequently Asked Questions
Q1: Can this relay drop in to replace other SR750 variants with different CT ratings?A: The P5/G5/S5 code defines 5A CT inputs. If your existing unit uses 1A CTs, this hardware will not match. Verify exact CT ratios and order code before swap.
Q2: What warranty is included for this GE SR750-P5-G5-S5-HI-A20-R?A: We provide a 12-month warranty. Warranty excludes surge damage, incorrect CT polarity wiring, and overvoltage events on the control supply.
Q3: What is the typical stock and shipping lead time?A: Stock levels for this legacy Multilin relay are limited. If in stock, shipment can go out within 1–2 business days. If stock is exhausted, we will confirm lead time before order confirmation.
Q4: What risk comes with loading a firmware version newer than the site’s existing relay bank?A: Newer firmware may change FlexLogic behavior or register mapping for SCADA. This can create mismatched alarms or broken point mapping. Test the setpoint file offline first.
Q5: Can I pull this drawout relay while the feeder remains energized?A: The drawout design allows removal, but do not remove it while the feeder is live unless the scheme has backup protection enabled. Removing it removes primary fault detection and leaves the circuit unprotected.
