Schneider REL52051 Easergy P3U30 Numerical Protection Relay

Schneider REL52051 Easergy P3U30 Numerical Protection Relay combines feeder protection with dual LC fibre-optic communication, making it suitable for substations that rely on fibre-based automation networks. Four current inputs, four voltage inputs, and expanded I/O capacity allow the relay to monitor feeder conditions while supporting protection, control, and signalling functions across the network.

This relay uses four ring lug current inputs and four voltage inputs to monitor feeder conditions and detect faults across the network. The combination of current and voltage measurement allows the relay to support a wide range of protection functions while maintaining visibility of system operating conditions.

With 16 digital inputs and 8 digital outputs, the REL52051 provides ample capacity for breaker status monitoring, protection interlocks, alarms, and control functions. The 220–230 V digital input range matches the signalling voltages commonly found in utility substations and industrial distribution systems.

The dual LC fibre ports allow direct integration into fibre communication networks, helping reduce electromagnetic interference concerns and supporting long-distance communication between protection and control devices.

Specifications

• Manufacturer: Schneider Electric
• Product Series: Easergy P3
• Model: P3U30
• Part Number: REL52051
• Relay Type: Numerical Protection Relay
• Protection Application: Feeder Protection
• Current Inputs: 4L Ring Lug
• Voltage Inputs: 4U
• Digital Inputs: 16 DI
• Digital Outputs: 8 DO
• Auxiliary Supply Voltage (Uaux): 48–230 V AC/DC
• Digital Input Voltage Range: 220–230 V
• Communication Ports: 2 × LC Fibre Optic
• Mounting Application: Protection and Control Panels

Features

• Dual LC fibre-optic ports for high-speed communication.
• Four current inputs and four voltage inputs for feeder monitoring.
• 16 digital inputs and 8 digital outputs for protection and control functions.
• Supports 220–230 V digital input circuits.
• Ring lug terminals for secure CT wiring connections.
• Event recording and fault logging capabilities.
• Suitable for fibre-based SCADA and automation systems.
• Supports medium-voltage feeder protection applications.

Applications

• Feeder Protection
• Distribution Substations
• Utility Power Networks
• Industrial Power Distribution Systems
• Medium Voltage Switchgear
• Fibre-Optic Communication Networks
• Protection and Control Panels
• SCADA and Substation Automation Systems

The Schneider REL52051 Easergy P3U30 combines protection, monitoring, control, and fibre-optic communication in a single platform for medium-voltage distribution networks.