Description
Product Core Brief
- Model: REL561
- Order Code: 1MRK002496-AC
- Brand: ABB
- Series: ABB REL561 line differential and distance protection relay family
- Core Function: High-speed phase-segregated line differential protection with distance and overcurrent backup for transmission and distribution lines.
- Product Type: Line differential and distance protection relay / IED
- Key Specs: Phase-segregated current differential | Distance protection | Overcurrent and earth-fault | Power swing detection | CBFP | Disturbance recording | Local HMI
- Lifecycle Note: Legacy product; RED615 is commonly referenced as a successor for line differential applications in ABB Relion 615 series.
- Condition: New Surplus / Used, depending on stock
Product Introduction
ABB REL561 1MRK002496-AC is a line protection relay designed for overhead lines and cable circuits. It provides phase-segregated current differential protection as the main protection function, with distance protection and overcurrent/earth-fault protection available as backup depending on the installed configuration.
The relay exchanges sampled current information between line ends through a digital communication channel, typically at 56/64 kbit/s. It supports channel supervision, CT saturation detection, fuse failure supervision, power swing detection, synchrocheck, auto-reclose and circuit-breaker failure protection.
The order code 1MRK002496-AC defines a specific hardware and software variant. Public listings 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.
REL561 is a legacy platform. For replacement or expansion projects, RED615 is frequently referenced as a successor line differential protection relay in the ABB Relion 615 series, 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 | 1MRK002496-AC |
| Product Type | Line differential and distance protection relay |
| Typical Application | HV/MV overhead lines, cable feeders, transmission and distribution networks |
| Protection Functions | Phase-segregated current differential, distance, overcurrent, earth-fault, power swing detection, CBFP, auto-reclose depending on configuration |
| Communication | Line-end digital channel; 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 REL561 and 1MRK002496-AC 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/VT ratings, communication option, I/O configuration and firmware version.
- Secondary injection test: Confirm differential, distance, overcurrent and earth-fault protection 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. 1MRK002496-AC defines a specific variant; other REL561 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. Distance protection, power swing detection and auto-reclose 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 REL561, 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 REL561 1MRK002496-AC | ABB REL561 1MRK002496-AC | Direct | Match full order code, firmware and channel configuration. |
| ABB REL561 1MRK002496-AC | ABB REL561 other order code | Needs Verification | Same family but different communication, I/O or function set. |
| ABB REL561 1MRK002496-AC | ABB RED615 | Needs Verification | Common successor path; confirm channel, I/O and protection settings. |
| ABB REL561 1MRK002496-AC | Generic line differential relay | Needs Verification | Requires full engineering review of channel, CTs and protection logic. |
Benchmarks:
- ABB REL561 line differential and distance protection relay family.
- Provides phase-segregated current differential protection with distance backup, power swing detection and disturbance recording.
- Legacy product; RED615 is a typical successor for REL561 replacement projects.
