Protection relays for digital substations

SIPROTEC 5 Compact

High-performance protection makes your power supply future-proof

Protection relays are essential for network operators, electricity suppliers, and industrial enterprises in every sector. For over 100 years, Siemens has been offering successful and always innovative SIPROTEC and Reyrolle protection relays and technologies. This means long-term user satisfaction with the products and solutions, with services, and with a partnership with a genuine global player. Siemens is the ideal partner for overcoming the challenges of the digital future.

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Single Event Upset (SEU) - A physical phenomenon and SIPROTEC 5 measures 

With the advancement of semiconductor technology in the nanometer range, a physical phenomenon, which was typically only observed in aerospace engineering up to now, has become also relevant to numerical protection devices. This white paper give an overview of the causes and effects of SEUs, as well as the solutions that SIEMENS uses to maintain the reliability of its SIPROTEC 5 products.


Protection relay products and software - Secure and efficient grid operation

Easy protection relay selector

Find the right protection relay

Easy protection relay selector

Easy protection relay selector

This tool gives a quick guidance to find a protection relay of SIPROTEC 5, SIPROTEC 4, SIPROTEC Compact, Reyrolle which would fit your needs.

Easy relay retrofit selector

Find the right substitute for your existing protection relays

Easy relay retrofit selector

Easy relay retrofit selector

Easy tool to find the right Siemens protection relay for your retrofit projekt.

Industry Mall

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Topics and applications

Solutions with SIPROTEC and Reyrolle protection relays

For over a century, innovative protection relay and control technology from Siemens has ensured a reliable power supply as well as secure and efficient grid operations. The comprehensive range of products and solutions meets all conceivable requirements.


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Application notes

Highest availability even in harsh environments

Highest availability even in harsh environment

SIPROTEC 5 and SIPROTEC Compact – Conformal Coating as standard

The new coating feature provides an additional level of protection for SIPROTEC devices used in extremely harsh environmental conditions.

Modular, flexible, intelligent


With SIPROTEC 5, Siemens is offering the most comprehensive protection portfolio in the industry.

SIPROTEC 5 sets the benchmark for protecting, automating, and monitoring your network. As an incomparably modular, flexible generation of intelligent digital field devices, SIPROTEC 5 offers a comprehensive product family with modular elements for every application and requirement that can be precisely configured to your application.

SIPROTEC 5 delivers maximum protection and flexibility throughout the entire lifecycle. Take advantage of the leading provider in the field of protection, a global partner that supports you every step of the way.

Protection Relay and Control technology

Reyrolle 5

Protecting Grids with Confidence

The protection, control, monitoring and measuring of our power networks is a vital element in managing our electrical assets, increasing reliability, sustainability and the safety of operating personnel. Our goal is to provide protection devices which provide flexible solutions and easy integration into an energy market which is becoming increasingly decentralized and digitalized. With the new Reyrolle5 we have listened to the changing needs of our customers.


Downloads and services

Retrofit and enhancement services

Retrofit and enhancement services

Extend the lifespans of your energy system and thereby significantly reduce your costs of ownership with our retrofits and enhancement services for energy automation.

Power Academy training services

Power Academy training services

Our goal is to prepare you for new professional challenges in power transmission and distribution. We offer professional training courses with different training methods like Virtual Classroom Training, Classroom Training, WBTs, Webinars and Blended Learning. You can choose between open enrollment training courses, customized training courses, workshops or long-term trainings (curricula).

Energy Automation and Digital Grid Newsletter


Receive news about the Digital Grid and Energy Automation portfolio and offerings!

Energy Automation Webinars

Energy automation webinars

Learn more in one of our energy automation webinars for protection and substation automation engineers and experts.

Proven worldwide

References - protection technology


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