ABB RED521 1MRK002003-BA

ABB RED521 1MRK002003-BA

It is a high-performance, high-reliability differential protection relay produced by ABB.

1. Core Product Overview

• Product Name: RED521 Differential Protection Relay

• Product Model: 1MRK002003-BA

• Primary Function: This is a digital differential protection relay designed for medium-voltage power networks. Its core purpose is to protect critical electrical assets such as transformers, generators, and motors.

• Product Family: It belongs to ABB’s renowned Relion® product family and is a member of the 620 series. This series is known for its advanced protection, control, monitoring, and communication capabilities.

2. Key Features & Functions

The core of the RED521 is to provide fast, sensitive, and selective differential protection to prevent damage from internal faults.

• Main Protection Functions:

  • Differential Protection: Detects internal faults by comparing the vector sum (differential current) of the currents entering and leaving the protected equipment. This is the primary and fastest protection function.

  • Percentage Differential Protection with 2nd Harmonic Restraint: Effectively distinguishes between fault currents and transformer inrush currents (generated during energization), preventing false trips.

  • High-Impedance Differential Protection: Offers an optional high-impedance differential scheme, particularly suitable for protecting busbars.

• Backup & Additional Protection Functions:

  • Overcurrent Protection: Provides definite-time and inverse-time overcurrent protection as a backup.

  • Earth-Fault Protection: Sensitive earth-fault and directional earth-fault protection.

  • Overload Protection: Monitors the thermal capacity of the equipment and provides an alarm or trip signal.

  • Non-Electrical Protection: Can interface with devices like Buchholz relays and temperature gauges via binary inputs to initiate tripping.

• Advanced Characteristics:

  • Powerful Fault Recording: Capable of recording current and voltage waveforms and data before, during, and after a fault for detailed analysis.

  • Measurement & Monitoring: Real-time monitoring of electrical parameters like current, voltage, power, energy, and frequency.

  • Event Logging: Detailed recording of all operations, alarms, and fault events with precise timestamps.

  • Communication Capabilities: Supports multiple industry-standard protocols such as IEC 61850 (Station and Process Level), Modbus, IEC 60870-5-103/104, enabling seamless integration into digital substations.

  • Human-Machine Interface (HMI): Features a clear LCD display and navigation keys on the front panel for local viewing and settings.

3. Typical Applications

The RED521 is widely used in power systems requiring high-reliability protection, especially for:

• Power Transformer Protection (two-winding or three-winding)

• Large Generator and Motor-Generator Protection

• Large High-Voltage Motor Protection

• Busbar Protection

• Critical Distribution Systems in industrial sectors (e.g., petrochemical, steel, data centers)

Sales of the brand:

ABB、EPRO、GE、FOXBORO、Schneider、Rexroth、Honeywell、Bently、YASKAWA other global DCS system and PLC system, servo system of famous industrial brand.

☀️Tara(Sales Director)

📞Tel: + 86-13806028623

📮Whatsapp:+86-13806028623

💬Email: ydf8801@163.com

🏚️Ship to you via DHL/TNT/UPS/EMS/Fedex

🥇Product Condition: One-year warranty

requently Asked Questions:
1. How long does it take to receive the goods?
We have stock in stock and can accept same-day payment and delivery!

2. What payment methods do you accept?
There are many methods (T/T…) for you to choose from, and you can choose whatever you want.

3. Is there after-sales service?
 they have a one-year warranty!

4. What courier services do you accept? We offer SF Express, DHL, and other international express delivery options.

5. How can I contact you?

You can contact me 24/7 via WeChat, Skype, WhatsApp, LINE, and my email!

Company Profile

Xingchuang Ronghe (Fuzhou) Electric Co., Ltd. is a company specializing in the sales and technical services of spare parts for the world’s top industrial automation systems. With our profound industry experience and stable supply channels, we provide domestic and foreign customers with original, authentic, complete models, and fast-delivered precision spare parts solutions. We are your reliable partner in ensuring production continuity and stability.

We specialize in distributing the following core brands and product lines:

ABB

•  Process Control: ABB DCS process control system full range of components.
• ABB FreeLance AC800F power modules: SA801F/SA811F/SD802F/SD812F, EI811F/ABB EI812F/ABB EI813F, etc.
• ABB S800 analog I/O modules: AI801/AI810/AI825/AO801/AO845/AO895
• ABB S800 digital I/O modules: DI801/DI810/DO801/DO810

Bently Nevada
3500 Module Mainboards: 3500/42, 3500/45, 3500/40, 3500/50, etc.
(CPU Modules): 3200/32, 3500/25
3500 Module Minimum Cards: 128229-01, 128229-01, 133442-01, 125800-01, 167699-02, etc.
Extension Cables: 330850-50-05 (for preamplifier), 330730-040-00-00, 330103-00-06-10-02-00, etc.

EPRO

•  MMS6000 TSI System: MMS6110/MMS6210/MMS6220 series monitoring modules.
  Sensors: Proximitor sensors CON011, CON021, CON031, etc

GE

• PLC Systems: IC693, IC695, and IC697 Series Modules.
• Drives and Protection: GE DRIVE SYSTEMS Series Inverters, SR Integrated Protection Frame Series.

Rexroth

• Drives and Motors: Full range of Rexroth servo drives and controllers; models include: servo motor 2AD160B-B0350R2-BS03-D2V1, MSK040C-0600-NN-M1-UP1-NSNN, etc.
• Rexroth communication boards and amplifier boards: MTS-P01.2-D2-B1-E1-NN-NN-FWEP, VT-VPCD-1-1X/V0/1-0-1, VT5006-17B, etc.

Siemens

· Process Instruments and Controllers: Siemens MOORE series, common models include: QLCDM024DCBAN, 39ACM24BEN, 39AC12T4V1, 16114-171, etc.
· Automation Systems: Full range of SIMATIC S5 PLCs, SIMATIC S7-400 CPU modules and expansion modules, Simatic C7 systems, and various Siemens touch screens.