Schneider Electric REL52002C

Schneider Electric REL52002C (Easergy P3U30 Universal Protection Relay)

REL52002C is a universal digital integrated protection relay from Schneider Electric’s Easergy P3U30 (formerly PowerLogic P3U30) series. Designed specifically for medium- and low-voltage power systems, it provides comprehensive protection, measurement, control, and communication functions.

1 Model Code Interpretation

Full corresponding order code: P3U30-5AAA3BBAC (standard configuration)

2 Key Specifications & Functions

2.1 Hardware Configuration

Analog inputs: 3 phase currents (CT) + 1 residual current (Io) + 4 voltages (VT)

Digital inputs (DI): 16 channels, universal for 220V AC/DC

Digital outputs (DO): 8 channels with watchdog function (reliable tripping under fault conditions)

Communication: RS485 (Modbus RTU); dual RJ45 Ethernet (IEC 61850) optional

Power supply: Wide range 48–230V AC/DC

2.2 Protection Functions (ANSI Standards)

2.3 Measurement & Monitoring

Full electrical parameters: current, voltage, power (active/reactive/apparent), power factor, frequency

Energy metering: four-quadrant energy accumulation, class 0.5S accuracy

Harmonic analysis: voltage/current 2nd to 31st harmonics monitoring

Event logging: 1000 events with timestamp (1 ms resolution)

Fault recording: built-in waveform capture before and after faults

3 Operating Environment

Standards: IEC 61850, IEC 60255, GB/T 14598 and other international/national standards

Operating temperature: -25°C ~ +70°C (wide-temperature design)

Storage temperature: -40°C ~ +85°C

Humidity: 5% ~ 95% (non-condensing)

Ingress protection: IP20 (front panel), suitable for panel mounting in switchgear

Vibration resistance: IEC 60068-2-6 (5–150Hz, 0.5g)

Typical Applications:

Medium- and low-voltage distribution substations (10kV/0.4kV)

Industrial plant power systems

Commercial building power distribution

Renewable energy grid connection (PV, wind)

Motor control centers (MCC)

UPS input/output protection in data centers

4 Related Models in the Same Series (REL520xx)

5 Official Ordering Information

Standard order code: REL52002C

Full configuration code: P3U30-5AAA3BBAC

Replacement reference: Can replace earlier PowerLogic P3 series protection relays

Accessories:

Communication module: P3-COM-ETH (IEC 61850 Ethernet module)

Extension module: P3-EXT-DIO (additional DI/DO expansion)

Local HMI: P3-HMI (local human-machine interface)

6 Replacement Models & Compatibility

6.1 Within-series Replacements

Lower DI voltage required: REL52020 (24V DI), REL52016 (110V DI)

Extended communication: REL52025 (dual RJ45 Ethernet)

6.2 Cross-series Replacements

Advanced applications: SEPAM 20 series (medium-voltage systems)

Economy applications: Easergy P3U20 series (simplified configuration, 10DI/5DO)

7 Engineering Implementation Notes

1. Mounting: Standard 4U height, 19-inch rack mounting; front-or rear-wiring optional
2. Wiring:

CT input: 5A/1A selectable (software configuration required)

VT input: 100V (line-to-line) / 57.7V (phase-to-neutral)

DI/DO: Phoenix terminals, screw or spring connection

3. Commissioning:

Parameter configuration and monitoring via Easergy Studio software

Local USB and remote network debugging supported

Comprehensive self-diagnostics for easy maintenance

REL52002C is a full-featured, flexible universal protection relay suitable for protection and monitoring in various medium- and low-voltage power systems, especially industrial applications requiring 220V digital inputs and RS485 communication.

Core Parameter Comparison Table – Schneider Electric Easergy P3U30 Series (REL520xx)

1 Basic Parameter Summary

2 Key Selection & Replacement Rules

2.1 Voltage Class Replacement

Original model: REL52002C (220V DI)

Direct replacement (only DI voltage differs):

110V systems → REL52016

24V low-voltage systems → REL52020

2.2 Communication Upgrade

RS485 only: keep REL52002C

IEC 61850/Ethernet required: REL52020 / REL52025

2.3 Non-interchangeable Cases

REL52010C with 2LC interfaces is for dedicated transformer connections and not for standard panels

Terminal types differ; cabinet wiring must match ring or standard terminals

3 Common Features (Across Series)

Protection: 50/51 overcurrent, 50N/51N earth fault, 27/59 voltage, 46 phase rotation, 49 thermal overload

Metering: Class 0.5S energy, 2–31 harmonics

Logging: 1000 time-stamped events, fault recording

Mounting: Standard 19-inch 4U for panel installation

Software: Configured via Easergy Studio

Application Scenarios – Schneider Electric REL520xx Series

1 REL52002C (220V DI + RS485)

Most common and widely used standard model

10kV general distribution substations: feeder, incomer, bus tie, station transformer, capacitor protection

Standard MCC panels in industrial plants, motors for pumps, fans, air compressors

0.4kV critical circuits in commercial buildings: malls, offices, hotels

Retrofit of old substations with only Modbus RTU for data upload

Municipal facilities: residential substations, streetlight power, small water pump stations

Characteristic: On-site 220V AC/DC control power, basic power monitoring only

2 REL52016 (110V DI + RS485)

For traditional high-voltage control circuits

Legacy substations and power plant auxiliary systems

Heavy industry: oil, chemical, metallurgy (typically 110V DC control power)

Substation retrofits: reuse existing 110V secondary cables without rewiring

Mining and heavy machinery plant distribution protection

3 REL52010C (110V DI + RS485 + 2LC)

Special transformer configuration scenarios

Custom medium-voltage switchgear with dedicated LC transformer interfaces

Special circuits with integrated metering and protection

Industrial projects with fixed CT/VT wiring requirements

Rare in general projects; custom-engineered model

4 REL52020 (24V DI + IEC 61850)

Low-voltage automation & smart grid applications

Data center UPS input/output, precision power distribution

PV and wind turbine box-type substations, energy storage grid connection

Smart microgrids and distributed generation projects

Power distribution for automated production lines linked with PLC (24V low-voltage control)

Small smart power stations requiring IEC 61850 communication

5 REL52025 (220V DI + Dual Ethernet IEC 61850)

High-end smart power distribution

New smart substations, main distribution in intelligent industrial parks

Rail transit (metro/high-speed rail): traction substations, power distribution

Critical circuits at airports, ports, large venues

High-end projects requiring network redundancy, remote O&M, centralized dispatching

Multi-device networking and centralized monitoring in control centers

General Industry Applications (Full Series)

Power systems: 10kV/35kV substations, switching stations, ring main units

Manufacturing: metallurgy, chemical, paper, electronics, equipment production

Renewables: PV, wind power, energy storage, EV charging clusters

Infrastructure: data centers, rail transit, hospitals, schools, commercial complexes

Mining & water: mine power, pump stations, wastewater treatment plant protection