Schneider REL52012 Easergy P3U Numerical Protection Relay

The Schneider REL52012 Easergy P3U Numerical Protection Relay designed for feeder and distribution network protection in medium-voltage electrical systems. It combines protection, measurement, monitoring, and control functions in a single device, making it suitable for substations, industrial facilities, utility networks, and infrastructure projects.

The relay is equipped with three current transformer inputs, one residual current input, and four voltage transformer inputs for continuous monitoring of electrical parameters. It helps detect and respond to conditions such as overloads, earth faults, phase faults, and voltage abnormalities, improving the reliability and safety of the power system.

With 16 digital inputs and 8 digital outputs, the relay can be integrated into a wide range of protection and automation schemes. RS485 communication allows connection to SCADA and remote monitoring systems for data acquisition and operational control.

Specifications

• Manufacturer: Schneider Electric
• Product Series: Easergy P3
• Model: P3U
• Part Number: REL52012
• Relay Type: Numerical Protection Relay
• Current Inputs: 3 CT (3CT)
• Residual Current Input: 1 Io
• Voltage Inputs: 4 VT (4VT)
• Digital Inputs: 16 DI
• Digital Outputs: 8 DO
• Auxiliary Supply Voltage: 48–230 V AC/DC
• Digital Input Voltage: 110 V
• Communication Interface: RS485

Features

• Numerical relay for medium-voltage protection applications.
• Current, voltage, and residual current monitoring.
• Protection against overload, earth fault, and abnormal operating conditions.
• 16 digital inputs and 8 digital outputs for control and signalling functions.
• RS485 communication for SCADA and automation system integration.
• Event and fault recording for system analysis and troubleshooting.
• Suitable for feeder, transformer, and distribution protection schemes.
• Wide auxiliary supply range for installation flexibility.

Applications

• Feeder Protection
• Distribution Substations
• Medium Voltage Switchgear
• Industrial Power Distribution Systems
• Utility Power Networks
• Infrastructure Projects
• Electrical Protection and Control Panels
• SCADA Integrated Power Systems

The Schneider REL52012 Easergy P3U relay is widely used in electrical distribution networks where dependable protection, monitoring, and communication capabilities are required for safe system operation.