SIST EN 50152-3-1:2017/A1:2026

Overview

SIST EN 50152-3-1:2017/FprA1:2025 is a critical European standard developed by CLC, focusing on railway applications concerning fixed installations of a.c. switchgear. Specifically, this standard addresses the particular requirements for measurement, control, and protection devices designed for use in a.c. traction systems. It applies to new low voltage devices installed indoors or outdoors, operating in coordination with high voltage equipment conforming to the a.c. line voltage and frequency criteria defined in EN 50163.

The 2025 amendment (A1) introduces essential updates that refine protection functions and harmonize testing parameters with related standards, ensuring compatibility and enhanced safety across railway electrical infrastructure.

Key Topics

• Scope of Devices: Covers low voltage measurement, control, and protective devices specifically for a.c. traction systems, including those not covered by other railway product standards where feasible.
• Voltage Detection Systems: Updates the normative reference from EN 61243-5 to EN IEC 62271-213:2021, aligning voltage detection and indicating system requirements with modern high-voltage switchgear standards.
• Protection Functions: Clarifies protection function specifications, allowing system designers or infrastructure managers to define the use of di/dt or du/dt protection, enhancing risk management and operational flexibility.
• Line Testing Standards: Amends short-circuit current values for 50 Hz traction systems in Annex A to reflect current practice, with a slight reduction from 16 kA to 15 kA, improving alignment with EN 50388-1:2022 and ensuring reliable line testing protocols.
• Harmonization: Ensures uniformity and coherence across electro-technical standards relevant to public rail transport fixed installations, improving interoperability and safety compliance.

Applications

SIST EN 50152-3-1:2017/FprA1:2025 supports critical functions in railway fixed installations, such as:

• Measurement Devices: Accurate monitoring of voltage, current, and electrical parameters vital to traction system performance.
• Control Systems: Effective management of switchgear operations, enabling safe and reliable connection and disconnection within traction infrastructure.
• Protection Devices: Enhanced safeguards against electrical faults, short circuits, and unexpected electrical surges through prescribed protection functions.
• Indoor and Outdoor Installations: Standard applies broadly across different environments, ensuring device reliability regardless of location.
• System Design Compliance: Supports railway infrastructure designers and operators in meeting up-to-date international normative requirements, reducing maintenance challenges and improving operational safety.
• Line Testing Procedures: Facilitates safer, more effective line testing and diagnostics to prevent failures in traction power networks.

Related Standards

SIST EN 50152-3-1:2017/FprA1:2025 references and aligns with several key European and international standards, including:

• EN 50163: Defines operating voltages and frequencies for railway traction power supply systems, ensuring device compatibility.
• EN IEC 62271-213:2021: High-voltage switchgear and controlgear standards covering voltage detection and indicating systems.
• EN 50388-1:2022: Provides specifications on the technical requirements for railway power supply and earthing systems, particularly relating to short-circuit currents.
• EN 50152 series: The overarching standard family dealing with fixed installations and a.c. switchgear for railway applications.

Keywords: EN 50152-3-1, railway applications, a.c. switchgear, measurement devices, control devices, protection devices, low voltage devices, traction systems, line testing, short-circuit current, railway fixed installations, European standard, CENELEC, railway electrical safety.