Description
3. Key Technical Specifications
- Product Type: Feeder Management Relay
- Phase Current Inputs: 5A nominal
- Ground Current Inputs: 5A sensitive ground
- Control Power: High range (HI) AC/DC
- Outputs: Configurable relay outputs with A20 options
- Setpoint Groups: Multiple programmable groups
- Communications: Multiple protocols supported
- Mounting: Draw-out chassis design
- Frequency: 25 to 60 Hz nominal
- Ambient Temperature: -40°F to +176°F storage range
- Protection Elements: Comprehensive overcurrent, thermal, and monitoring functions
4. Product Introduction & Supply Chain Strategy
The GE SR750-P5-G5-S5-HI-A20-R is a Multilin feeder management relay that provides primary protection and control for distribution feeders. It includes advanced features for overcurrent, voltage, frequency, and breaker management in industrial and utility power systems.
New Surplus procurement for the SR750 series delivers strong Total Cost of Ownership by ensuring immediate availability of genuine parts for legacy systems still in service. With end-of-manufacturing notices on many SR relays, maintaining 1-2 units on-site as insurance prevents extended outages from protection failures. This strategy supports vendor consolidation and avoids the higher risks and shorter warranties of refurbished alternatives.
5. Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety) Lock-out and tag-out the feeder. Use an ESD wrist strap. Photograph all rear terminal wiring, CT connections, and front panel settings. Record the existing relay settings file if available.
Stage 2: Removal De-energize control power. Release the draw-out chassis by loosening the thumb screws. Carefully slide the old relay out of the case.
Stage 3: Installation (Clone & Seat) Insert the new SR750-P5-G5-S5-HI-A20-R chassis into the existing case. Secure the draw-out mechanism. Reconnect all wiring exactly as documented.
Stage 4: Power-On & Testing Apply control power and verify self-test passes. Download or manually enter settings. Perform injection testing on CT inputs and output contacts. Confirm proper operation before returning the feeder to service.
- SR750-P5-G5-S5-HI-A20-R
- SR750-P5-G5-S5-HI-A20-R
6. Firmware/Software Versions & Upgrade Notes
Match the firmware revision to your existing SR750 configuration for full compatibility. Use GE Multilin software tools to manage settings and firmware.
Significant firmware jumps can alter protection element behavior or communication mappings. Upgrading during replacement requires full testing of all protection functions. Avoid downgrading firmware as it may introduce known issues. Always save and verify the settings file before and after the swap.
7. Frequently Asked Questions (FAQ)
Q: Is this SR750-P5-G5-S5-HI-A20-R New Surplus? Yes. It is supplied as genuine New Surplus from authorized sources. The unit receives quality verification but remains in original new condition without refurbishment.
Q: Why select New Surplus instead of refurbished relays? Protection relays demand the highest reliability. Refurbished units risk contact wear or calibration drift that can compromise feeder safety and lead to costly outages or equipment damage.
Degraded internal components can cause false trips or failure to trip during faults. The resulting downtime or safety incidents quickly exceed any apparent procurement savings.
Q: Is the series obsolete? The platform has reached end-of-manufacturing status. Strategic New Surplus stocking is the recommended approach to support installed base reliability.
Q: Can the relay be hot-swapped? Draw-out design allows replacement with minimal disruption in some setups, but always isolate the feeder and test thoroughly afterward to maintain protection integrity.
Q: What warranty is provided? This New Surplus unit carries a 1 year warranty backed by traceability and functional verification.
Q: How do I transfer settings to the new relay? Use the GE EnerVista software to upload the saved settings file from the old unit. Verify all protection elements and logic after loading. Perform secondary injection tests to confirm correct operation.
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