SIEMENS 7SJ5311-4EA02-1AA0/FF Numerical Protection Relay

Overview

The Siemens 7SJ5311-4EA02-1AA0/FF is a numerical protection relay from the SIPROTEC 7SJ531 series. It is specifically designed for protecting motors and power lines in industrial power distribution systems. With fast processing, advanced protection functions, and strong communication capabilities, it ensures both operational safety and system stability.

Technical Specifications

Monitoring Functions

• Measured Values: Current, voltage, power, and frequency

• Energy Metering: Active and reactive energy tracking

• Diagnostics: Fault recording and event protocol logging

Communication Interfaces

• SCADA Support: IEC 870-5-103 protocol

• PC Connection: DIGSI software for configuration and diagnostics

Hardware Details

• Auxiliary Voltage Options: 24/48/60/110/125/220/250 V DC

• Analog Inputs: 5 current transformer inputs, 3 voltage transformer inputs

• Digital I/O: 11 binary inputs, 5 alarm relays, 4 command relays

Environmental Conditions

• Operating Temperature: -25°C to +60°C

• Storage Temperature: -40°C to +70°C

• Protection Class: IP20

Design and Performance

• Modular Construction: Enables hardware/software expansion

• Fast Processing: Supports complex protection logic and rapid response