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

Description

The Siemens 7SJ5311-4EA02-1AA0/FF is a numerical protection relay from the SIPROTEC 7SJ531 series, engineered for safeguarding motors and power lines in industrial power distribution systems. It combines advanced protection, control, and monitoring functions to ensure system stability and fault detection.

Specifications

• Product Type: Numerical Protection Relay

• Series: SIPROTEC 7SJ531

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

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

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

• Communication Interfaces: IEC 870-5-103 (SCADA), DIGSI software, modem support

• Measured Values: Current, voltage, power (active/reactive), frequency

• Energy Metering: Tracks active and reactive energy

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

• Storage Temperature: -40°C to +70°C

• Protection Class: IP20

• Dimensions (W x H x D): 26.00 cm × 33.00 cm × 9.50 cm

• Weight: Approx. 1.43 kg

• Compliance: CE, RoHS certified

• Warranty: 1 year standard

Features

• Comprehensive Protection: Overcurrent, earth fault, overload, undervoltage/overvoltage, motor and transformer protection

• Directional Detection: Phase-selective for both phase and earth faults

• Control Capabilities: Operates up to 5 switching devices via panel, binary inputs, or SCADA

• Fault Recording: Up to 5 seconds of analog and binary trace storage

• Event Logging: Real-time clock with timestamped fault and operational logs

• Flexible Configuration: User-defined characteristics and free assignment of inputs/outputs

• Remote Access: Full support for modem-based diagnostics and parameter setting

• Modular Design: Expandable hardware/software architecture for future upgrades