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Phone: +86 16626708626Description
Key Technical Specifications
- Protection functions: Phase 50/51, ground 50G/51G
- CT input: 1 A or 5 A secondary, must match order code
- Control power: LO range, 20 to 60 V DC or 20 to 48 V AC
- Communications: RS485, Modbus RTU
- Phase time overcurrent pickup: 20 to 100% of CT rating, or OFF
- Ground time overcurrent pickup: 15 to 55% of CT rating in 5% steps, or OFF
- Phase instantaneous pickup: 4, 5, 6, 8, 10, 12, 14, 16, 20 × CT, or OFF
- Ground instantaneous pickup: 0.1, 0.2, 0.4, 0.8, 1, 2, 4, 8, 16 × CT, or OFF
- Operating temperature: -40 C to +70 C
- Power consumption: 10 W nominal, 25 W maximum
- Weight: 15 lb / 6.8 kg
- Mounting: Drawout relay case
Product Introduction
GE Multilin 735-5-5-LO-483 is a digital feeder protection relay for primary circuit protection on distribution networks. It uses 1 A or 5 A CT inputs, LO-range control power, and RS485 Modbus RTU communications for feeder and backup protection applications.iemworldwide.
This relay is chosen for phase and ground overcurrent protection, front-panel indication, and drawout construction that simplifies replacement work. The 735 platform is discontinued, so buyers usually source it as surplus stock or for direct replacement in legacy GE Multilin installations.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs on power-up | No control power, blown fuse, or wrong voltage class | ✅ High | Measure control power at the relay terminals; confirm 20 to 60 V DC or 20 to 48 V AC for LO units | Check supply, fuse, and wiring before replacing the relay |
| Relay in service LED off | Internal fault, failed self-check, or service output active | ✅ High | Read front-panel status and verify service relay state with a meter | If the relay reports service required, replacement is usually justified |
| Unexpected trip on feeder | Pickup settings too low, CT ratio mismatch, or external fault | ⚠️ Medium | Compare CT secondary and dial settings; review trip record and fault current | Verify settings and CT wiring before condemning the relay |
| Communication loss on RS485 | Wrong baud rate, address, or polarity | ✅ High | Check RS485 pair polarity, address switches, and baud setting | Mirror the existing site settings exactly |
| Ground fault element nuisance trip | Residual CT wiring issue or grounding scheme mismatch | ✅ High | Inspect CT polarity and verify residual sum wiring | Recheck ground sensing method and wiring diagram |
| No trip during test injection | Pickup set too high, wrong CT secondary, or trip coil issue | ✅ High | Inject secondary current and confirm pickup LEDs and output relay operation | Verify settings, then test trip circuit and breaker coil |
| Current display looks wrong | CT ratio mismatch or bad secondary wiring | ✅ High | Compare displayed current with injected value on a known good test set | Confirm CT rating and terminal wiring before swapping hardware |
Contact technical support with photos of the front panel, DIP switch positions, wiring terminals, and the trip record if the fault still does not isolate cleanly.
- 735-5-5-LO-483
- 735-5-5-LO-483
Frequently Asked Questions (FAQ)
Q: Is this a direct replacement for GE 735-5-5-LO-483?
A: Yes, if your existing unit uses the same order code, CT secondary, and control-power range. Do not assume a close part number will fit; the CT and power variants matter.iemworldwide.
Q: Can I hot-swap this relay?
A: No. Kill control power first and verify the circuit is safe. Swapping energized protection gear is how you damage the backplane, the relay, or both.
Q: What does LO mean on this model?
A: LO identifies the low-range control power version, rated for 20 to 60 V DC or 20 to 48 V AC. That is the first thing to confirm before ordering a replacement.iemworldwide.
Q: What communications does it use?
A: This relay uses RS485 with Modbus RTU as standard. If your panel was wired for a different serial option, verify the port and settings before installation.
Q: Is it obsolete?
A: Yes. GE Vernova lists the 735/737 family as discontinued, with the Multilin 850 as the suggested replacement path. That is why surplus units still move in legacy plants.
Q: Why is the price lower than factory new stock?
A: Most of these units are surplus, open-box, or tested used inventory from legacy systems. That lowers cost, but you should expect older packaging and verify condition before purchase.
Q: Will my settings stay in place after a swap?
A: Usually the physical dials and switch positions define the setup, so copy them exactly. Take clear photos before removal; that saves a lot of rework.
