Schneider Protection Relay – Comprehensive Guide for Medium Voltage Applications
Schneider protection relay solutions are among the most trusted and widely used in medium voltage electrical networks worldwide. Schneider Electric offers a complete and scalable range of digital protection relays designed for reliable protection, control, and monitoring of feeders, transformers, motors, generators, busbars, and capacitors.
In modern power systems, a protection relay acts as the intelligent brain of the electrical network. It continuously monitors current, voltage, frequency, and other parameters, detects faults quickly, and sends trip commands to circuit breakers. Schneider Electric provides robust, flexible, and communication-ready relays that meet the demanding requirements of industrial plants, utilities, and commercial facilities.
Main Schneider Relay Families by Application
Schneider organizes its protection relays according to specific applications, making it easier for engineers and contractors to select the right solution:
- Feeder Protection Relays — For incoming and outgoing medium voltage lines
- Transformer Protection Relays — Differential, thermal, and backup protection
- Motor Protection Relay — Advanced thermal, unbalance, and locked rotor protection
- Generator Protection Relays
- Busbar and Capacitor Bank Protection
- Overcurrent Protection Relay and Voltage Protection Relay solutions
1. Sepam Series
The Sepam range is a proven, modular, and user-friendly Schneider protection relay family. It has been widely used for many years in transformer, motor, feeder, and generator protection applications.
With models such as Sepam 20, Sepam 40, and Sepam 80, this series offers excellent metering accuracy, comprehensive event recording, disturbance recording, and strong communication capabilities. Sepam relays are known for their reliability and ease of use, making them a popular choice for both new installations and retrofit projects.
2. Easergy Series – P1, P3, P5 (PowerLogic)
The Easergy series represents Schneider’s modern generation of compact and powerful medium voltage protection relays. This family (previously known as Easergy P3 in some markets) is designed for today’s smart grid and industrial requirements.
- Easergy P1: Entry-level protection relay offering simplicity, reliability, and cost-effectiveness. Ideal for basic feeder and motor protection where straightforward functionality is sufficient.
- Easergy P3 (PowerLogic P3): The most popular model in the series. It is a compact yet powerful relay offering more than 40 protection functions, including advanced overcurrent, earth fault, and arc flash protection relaycapabilities. It supports LPCT/LPVT sensors, Ethernet communication, and full IEC 61850 protocol. Easergy P3 provides an excellent balance between features, size, and performance for standard MV applications.
- Easergy P5 (PowerLogic P5): The advanced model designed for more complex and demanding applications. It offers enhanced functionality, multiple Ethernet protocols, embedded web server configuration, and superior performance in large industrial plants and utility substations.
3. MiCOM Series (Easergy MiCOM Px40)
MiCOM (now part of the Easergy MiCOM Px40 series) is Schneider’s high-end, utility-grade protection relay platform. It is designed for transmission, distribution, and critical high-voltage applications.
Models such as MiCOM P14x (feeder), P24x (motor), and other variants provide advanced protection functions including distance protection, differential protection, and interconnection protection. These relays are known for their scalability, high accuracy, and robust performance in harsh environments.
Key Features of Schneider Protection Relays
Schneider Electric relay products stand out with several important advantages:
- Fast and accurate fault detection with high selectivity
- Comprehensive protection functions covering overcurrent, earth fault, differential, voltage, frequency, and arc flash
- Easy configuration and setting using dedicated software tools
- Multiple communication protocols including Modbus, DNP3, and full IEC 61850
- Robust hardware design suitable for harsh industrial and outdoor environments
- Advanced diagnostics, event recording, and disturbance recording
- Support for modern sensor technologies (LPCT/LPVT)
Whether you need a simple overcurrent protection relay, a motor protection relay, or a sophisticated differential protection relay, Schneider offers scalable solutions that can be tailored to your specific application.
How to Choose the Right Schneider Protection Relay
When selecting a Schneider protection relay, consider the following factors:
- Required protection functions (ANSI codes)
- Application type (feeder, transformer, motor, generator, etc.)
- Communication requirements (IEC 61850, Ethernet, etc.)
- Need for arc flash protection
- Sensor type (conventional CT/VT or LPCT/LPVT)
- Panel space and mounting requirements
- Future expansion and integration needs
Schneider’s clear product segmentation (Sepam, Easergy P1/P3/P5, and MiCOM) helps users quickly identify the most suitable relay for their project.
Schneider protection relay solutions provide reliable, flexible, and future-ready protection for medium voltage networks. From the proven Sepam series to the modern and compact Easergy P3 and advanced Easergy P5, Schneider offers a complete portfolio that meets the needs of industrial, commercial, and utility applications.
With strong communication capabilities, advanced protection functions, and excellent build quality, Schneider relays help improve system reliability, reduce downtime, and enhance personnel safety through features such as arc flash protection.
For any medium voltage protection project, choosing the right Schneider relay ensures long-term performance and peace of mind.
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