Schneider REL52017 Easergy P3U Numerical Protection Relay

The Schneider REL52017 Easergy P3U Numerical Protection Relay is a feeder protection relay configured with 3 CT ring lug inputs, 1 residual current input, 4 voltage inputs, 16 digital inputs, and 8 digital outputs. This version is equipped with dual RJ45 Ethernet ports, making it a good choice for switchgear and substations where protection relays are connected directly to Ethernet-based SCADA or automation networks.

The relay continuously monitors current, voltage, and earth fault conditions and can trip the circuit when abnormal conditions are detected. The 220 V digital inputs allow it to be used in installations where higher-voltage control and signalling circuits are already in place, reducing the need for additional interface components.

Ring lug CT terminals provide a secure wiring connection and are often preferred in retrofit projects and panel upgrades. The dual Ethernet ports simplify network wiring and communication between protection devices, control systems, and monitoring software.

The REL52017 is commonly used in medium-voltage feeders, distribution substations, industrial power systems, and utility networks where Ethernet communication and dependable feeder protection are required.

Specifications

• Manufacturer: Schneider Electric
• Product Series: Easergy P3
• Model: P3U
• Part Number: REL52017
• Relay Type: Numerical Protection Relay
• Current Inputs: 3 CT Ring Lug
• Residual Current Input: 1 Io
• Voltage Inputs: 4 VT
• Digital Inputs: 16 DI
• Digital Outputs: 8 DO
• Auxiliary Supply Voltage: 48–230 V AC/DC
• Digital Input Voltage: 220 V
• Communication Ports: 2 × RJ45 Ethernet

Features

• Numerical protection relay for medium-voltage distribution systems.
• Three ring lug CT inputs for current measurement and protection.
• Residual current monitoring for earth fault detection.
• Four voltage inputs for voltage measurement and protection functions.
• 16 digital inputs and 8 digital outputs for control and signalling applications.
• Dual RJ45 Ethernet ports for communication and network integration.
• Event logging and fault recording capabilities.
• Supports integration with SCADA and substation automation systems.
• Wide auxiliary supply range for flexible installation.

Applications

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

The Schneider REL52017 Easergy P3U relay is widely used in electrical distribution networks where dependable protection, monitoring, and communication functions are required for reliable system operation.