Description
Product Core Brief
- Model: REL551
- Order Code: 1MRK002480-AE
- Brand: ABB
- Series: ABB REL551 line differential protection relay family
- Core Function: High-speed line differential and backup protection for overhead lines and cable feeders.
- Product Type: Line differential protection relay / IED
- Key Specs: Phase-segregated current differential | Distance/overcurrent backup depending on configuration | Communication-channel supervision | Disturbance recording | Event logging | Local HMI
- Lifecycle Note: Legacy product; RED615 is commonly referenced as a successor in ABB upgrade programs.
- Condition: New Surplus / Used, depending on stock
Product Introduction
ABB REL551 1MRK002480-AE is a medium-voltage line protection relay designed for feeder and transmission line applications. It provides phase-segregated line differential protection, making it suitable for short lines, cable circuits, industrial feeders and networks where fast, selective fault clearance is required.
The relay compares current signals between line ends through a communication channel. It supports channel supervision, CT saturation handling and disturbance recording. Depending on the installed function set and project configuration, it can also provide overcurrent, earth-fault or distance protection as backup functions.
The order code 1MRK002480-AE identifies a specific hardware and software variant. Public sources do not provide a complete decoding of this exact code, so auxiliary voltage, communication interface, I/O configuration and protection function set must be verified from the device nameplate and order documentation.
REL551 is a legacy platform. For replacement or expansion projects, RED615 is frequently referenced as a successor line protection relay, but panel cutout, wiring, I/O mapping, communication channel and protection settings must be confirmed before migration.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Brand | ABB |
| Model | |
| Order Code | 1MRK002480-AE |
| Product Type | Line differential protection relay |
| Typical Application | MV/HV overhead lines, cable feeders, industrial and utility networks |
| Protection Functions | Line current differential, overcurrent, earth-fault, distance backup depending on configuration |
| Communication | Line-end communication channel; protocol/interface depends on installed option |
| HMI / Engineering | Local display, navigation keys, event and disturbance records |
| Condition | New Surplus / Used |
Quality Control Process
- Full order code verification: Confirm REL551 and 1MRK002480-AE match the original nameplate.
- Visual inspection: Check front HMI, terminal blocks, communication ports, plug-in modules and signs of overheating.
- Nameplate confirmation: Verify auxiliary voltage, CT ratings, communication option, I/O configuration and firmware version.
- Secondary injection test: Confirm differential protection, backup protection and trip output operation.
- Channel test: Verify communication channel, delay compensation and channel supervision if applicable.
- Packing: Anti-static bag, moisture barrier, rigid corner protection and reinforced carton.
Replacement Pitfall Guide
❗ Confirm the full order code. 1MRK002480-AE defines a specific variant; other REL551 codes may differ in communication interface, I/O and protection functions.
❗ Do not assume identical channel interface. Line differential protection depends on compatible communication between both line ends; fiber, serial or pilot-channel options must match.
❗ Verify backup protection set. Overcurrent, earth-fault and distance protection availability depends on the configured function set.
❗ Check CT polarity and ratio. Incorrect CT wiring or ratio settings can cause differential misoperation.
❗ Plan successor migration carefully. RED615 is a commonly referenced successor for REL551, but wiring, I/O, communication channel and protection logic must be reviewed before replacement.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level | Migration Notes |
|---|---|---|---|
| ABB REL551 1MRK002480-AE | ABB REL551 1MRK002480-AE | Direct | Match full order code, firmware and channel configuration. |
| ABB REL551 1MRK002480-AE | ABB REL551 other order code | Needs Verification | Same family but different communication, I/O or function set. |
| ABB REL551 1MRK002480-AE | ABB RED615 | Needs Verification | Common successor path; confirm channel, I/O and protection settings. |
| ABB REL551 1MRK002480-AE | Generic line differential relay | Needs Verification | Requires full engineering review of channel, CTs and protection logic. |
Benchmarks:
- ABB REL551 line differential protection relay family.
- Provides phase-segregated current differential protection with communication-channel supervision and disturbance recording.
- Legacy product; RED615 is a typical successor for REL551 replacement projects.
