Description
Detailed parameter table
| Parameter name | Parameter value |
| Product model | REL551 1MRK002480-AE |
| Manufacturer | ABB |
| Product category | Numerical protective relay |
| Application | Medium-voltage distribution networks (6-20 kV) |
| Protection functions | Overcurrent, earth fault, phase imbalance, thermal overload |
| Communication protocols | IEC 60870-5-103, Modbus RTU, Profibus DP |
| Inputs/outputs | 12 digital inputs, 6 digital outputs, 4 analog inputs |
| Operating voltage | 110-250 V DC/AC |
| Power consumption | Max 12 W |
| Operating temperature | -30°C to 60°C |
| Dimensions | 120mm × 160mm × 110mm |
| Mounting type | Panel mount |
| Protection rating | IP40 (front), IP20 (rear) |
| Certifications | IEC 60255, CE, UL, VDE |
ABB REL551 1MRK002480-AE
Product introduction
The ABB REL551 1MRK002480-AE is a compact numerical protective relay designed for reliable protection and control of medium-voltage distribution networks, specifically optimized for 6-20 kV systems. As a key member of ABB’s Relion® family, ABB REL551 1MRK002480-AE offers a balance of essential protection functions and user-friendly operation, making it ideal for small to medium-sized substations, industrial facilities, and commercial power systems.
ABB REL551 1MRK002480-AE replaces traditional electromechanical relays with digital precision, integrating overcurrent, earth fault, and thermal overload protection in a single device. Its simplified configuration interface and compatibility with legacy communication protocols ensure easy integration into existing networks, while its rugged design guarantees performance in harsh industrial environments. Whether deployed to protect feeders, transformers, or motors, ABB REL551 1MRK002480-AE delivers fast fault detection and selective tripping, minimizing downtime and enhancing system reliability.
Core advantages and technical highlights
Simplified operation for ease of use: ABB REL551 1MRK002480-AE features a user-friendly front-panel interface with a 4-line LCD display and navigation buttons, allowing quick access to settings, measurements, and fault logs without requiring a laptop. This simplifies commissioning and troubleshooting, reducing the need for specialized training. In a rural substation with limited technical staff, this intuitive design cuts configuration time by up to 50% compared to more complex relays, ensuring faster deployment and easier maintenance.
Cost-effective protection solution: By integrating multiple protection functions into a compact form factor, ABB REL551 1MRK002480-AE eliminates the need for separate devices, reducing both initial investment and cabinet space requirements. For a 10 kV industrial distribution network with 10 feeders, using ABB REL551 1MRK002480-AE instead of individual electromechanical relays lowers hardware costs by approximately 30% while reducing wiring complexity. Its low power consumption (max 12 W) also contributes to long-term energy savings.
Legacy protocol compatibility: ABB REL551 1MRK002480-AE supports IEC 60870-5-103, Modbus RTU, and Profibus DP, ensuring seamless integration with older SCADA systems and control panels common in many existing power networks. This makes it an ideal retrofit solution for facilities upgrading from electromechanical to digital protection without replacing their entire communication infrastructure. In a manufacturing plant with a legacy DCS, the relay can transmit real-time data and fault records directly to the existing system, avoiding costly network overhauls.
Typical application scenarios
In a rural 10 kV distribution network powering agricultural facilities and small towns, ABB REL551 1MRK002480-AE protects overhead lines and distribution transformers from overcurrent and earth faults. Its phase imbalance protection detects issues like broken conductors or single-phasing in motors, preventing equipment damage and ensuring continuous power to critical irrigation systems. The relay’s ability to operate in temperatures as low as -30°C ensures reliable performance in remote, unheated substations during winter months.
In a mid-sized industrial plant with a 6 kV internal distribution system, ABB REL551 1MRK002480-AE protects feeders supplying power to production machinery, compressors, and HVAC systems. Its thermal overload protection monitors motor currents, issuing alarms or tripping before overheating occurs—critical for preventing unplanned downtime in manufacturing processes. The relay communicates via Modbus RTU with the plant’s PLC, providing real-time current and voltage data for energy management and load balancing.
ABB REL551 1MRK002480-AE
Related model recommendations
ABB REL551 1MRK002480-CE: A variant of ABB REL551 1MRK002480-AE with additional differential protection, suitable for transformer applications.
ABB REC650 1MRK008514-AA: A higher-capacity relay that complements ABB REL551 1MRK002480-AE in larger distribution networks requiring advanced functions.
ABB RIO600 1MRK006421-BA: An I/O extension module that increases the input/output capacity of ABB REL551 1MRK002480-AE in complex systems.
ABB PPE091A101 3BHE044481R0101: A stable power supply ensuring reliable operation of ABB REL551 1MRK002480-AE in critical applications.
ABB CI854A 3BSE022496R1: A PROFIBUS communication module enhancing ABB REL551 1MRK002480-AE’s connectivity to industrial networks.
ABB HMI50: A compact interface panel providing local access to ABB REL551 1MRK002480-AE’s settings and diagnostics.
Installation, commissioning and maintenance instructions
Installation preparation: Mount ABB REL551 1MRK002480-AE on a flat, stable panel using the provided screws, ensuring at least 30mm clearance for ventilation. Connect control power (110-250 V DC/AC) with 1mm² shielded cable, protected by a 1A fuse. Wire current transformers (CTs) to analog inputs, verifying correct polarity with a clamp meter. Digital inputs/outputs require 0.5mm² cable, with shields grounded at the relay end. Use a torque screwdriver set to 1.2 Nm for terminal connections. Power off all systems during installation to prevent electrical hazards.
Maintenance suggestions: Inspect ABB REL551 1MRK002480-AE annually for loose connections, dust accumulation, and front panel damage. Clean the device with a soft brush or dry cloth—avoid liquids or compressed air. Verify protection settings semi-annually via the front panel or configuration software, ensuring they match current network conditions. Test trip functionality annually using a relay test set to confirm correct operation. If communication faults occur, check wiring and protocol settings before replacing components. Use only ABB-certified spare parts to maintain protection accuracy.
Service and guarantee commitment
ABB REL551 1MRK002480-AE is backed by a 4-year warranty from installation, covering manufacturing defects and ensuring compliance with published performance standards. ABB’s technical support team provides response within 8 hours for standard inquiries, with remote troubleshooting available during business hours to minimize downtime. On-site service is available within 5 business days in major regions for complex issues.
The warranty includes free access to configuration software and technical documentation. Extended service contracts offer biennial calibration, functional testing, and priority support, ensuring optimal performance throughout the relay’s 15-year design lifespan. ABB’s commitment to quality underscores confidence in ABB REL551 1MRK002480-AE as a reliable, cost-effective solution for protecting medium-voltage power systems.
