Description
Product Introduction & Engineering Value
The GE 735-5-5-LO-483 is a configured GE Multilin 735 motor protection relay intended for monitoring, protection, and control of industrial motors. The complete suffix matters because the 735 family is available in multiple hardware and I/O configurations.
For a replacement project, do not order by “Multilin 735” alone. Match the complete catalog number, power supply, communications options, CT/VT arrangement, I/O configuration, and installed relay settings before commissioning.
Technical Specifications
- Manufacturer: General Electric
- Product Family: Multilin 735
- Model: 735-5-5-LO-483
- Product Type: Digital motor protection relay
- Primary Application: Motor protection and control
- Protection Functions: Application-configured motor protection
- Monitoring: Electrical measurements and operating conditions
- Control: Trip/control outputs according to configuration
- Communications: Configuration-dependent
- I/O: Configuration-dependent
- Power Supply: Verify from the complete catalog number and nameplate
- Installation: Industrial protection/control panel
Configuration warning: The 5-5-LO-483 suffix should be treated as part of the product identity. Do not assume power-supply ratings, communications interfaces, contact arrangements, or I/O capabilities from another Multilin 735 variant.
Field Application & the “Trench” Experience
A medium-voltage motor trips during a production run. The protection relay has logged an event, but the relay itself is becoming unreliable. The plant has a spare Multilin 735 on site.
The maintenance engineer checks the nameplate before installing it.
The existing relay is 735-5-5-LO-483. The spare has the same complete catalog number, so the team proceeds to the next step: documenting the existing relay’s settings, CT ratios, trip thresholds, output assignments, communications parameters, and event configuration.
The hardware replacement is only half the job.
A protection relay with the wrong settings can be electrically healthy and still provide the wrong protection.
Specific application scenarios
- Medium-voltage motor protection — overcurrent, overload, phase-related, and other configured protection functions.
- Critical process-motor protection — maintaining protection for pumps, compressors, fans, and other continuously operating motor loads.
- Motor control-panel replacement — replacing an aging 735 relay while preserving the existing protection philosophy and settings.
Transparency SOP: QA & Testing
For a protection relay, QA should include both hardware verification and configuration checks.
Recommended acceptance procedure
- Catalog-number verification — confirm
735-5-5-LO-483against the nameplate and purchase documentation. - Physical inspection — check the enclosure, display, terminals, connectors, and mounting hardware.
- Power-supply verification — confirm the relay’s required supply against the installation.
- Input/output inspection — verify terminal condition and configured I/O.
- Configuration review — compare protection settings with the original relay where a replacement is being performed.
- Communications check — verify the applicable network or serial interface and addressing.
- Relay testing — perform appropriate secondary-injection and functional protection testing before placing the relay into service.
- Final documentation — archive the relay settings, test results, firmware information, and warranty details.
PROTECTION NOTE: A relay that powers up and displays normally has not necessarily passed a protection-function test.
735-5-5-LO-483
735-5-5-LO-483
The Veteran’s Tech Trap Guide
⚠️ Trap #1 — Ordering “Multilin 735” without the complete suffix
The 735 family has multiple configurations.
PRO TIP: Record the complete 735-5-5-LO-483 catalog number before requesting a replacement.
⚠️ Trap #2 — Copying settings without checking CT ratios
Protection calculations depend heavily on instrument-transformer ratios and wiring. Confirm the actual field CT configuration rather than blindly importing an old settings file.
⚠️ Trap #3 — Treating firmware as irrelevant
A replacement relay may have a different firmware revision. Check compatibility with the existing configuration tools, settings files, and plant protection standards before commissioning.
⚠️ Trap #4 — Skipping secondary injection
For critical motor protection, a functional relay test is preferable to a simple power-up check. Verify the actual trip and alarm functions that the plant depends on.
Dynamic FAQ
What is the GE 735-5-5-LO-483?
The 735-5-5-LO-483 is a configured GE Multilin 735 digital motor protection relay intended for industrial motor protection, monitoring, and control.
What applications is it used for?
Typical applications include medium-voltage industrial motors such as pumps, compressors, fans, and other critical motor-driven equipment. The exact protection scheme depends on the installation.
Is the 735-5-5-LO-483 interchangeable with another Multilin 735?
Not automatically. Verify the complete catalog number, power supply, I/O configuration, communications hardware, and protection requirements.
What should I provide when sourcing a replacement?
Provide the complete 735-5-5-LO-483 catalog number, relay nameplate photograph, firmware information if available, existing settings file, CT/VT ratios, and relevant panel documentation.
Should I test a New Surplus relay?
Yes. A New Surplus relay should be inspected and function-tested before being placed into a protection circuit. For critical applications, secondary-injection testing should be considered.
What does New Surplus mean?
New Surplus generally means unused inventory outside the manufacturer’s current production or normal distribution channel. It does not necessarily mean recently manufactured.
What does Refurbished mean?
Refurbished generally means previously used or returned equipment has been inspected and may have been repaired and function-tested. Ask for the actual testing and repair scope.
What warranty should I request?
Confirm the warranty duration, covered failures, return procedure, and condition of the relay supplied. New Surplus and Refurbished units should have clearly stated warranty terms. A supplier warranty should not be presented as a GE factory warranty unless that status is documented.
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