SIST EN IEC 60947-10:2026

Overview

SIST EN IEC 60947-10:2026, "Low-voltage switchgear and controlgear - Part 10: Semiconductor circuit-breakers," sets out the requirements and test procedures for semiconductor circuit-breakers (SCCBs) and semiconductor hybrid circuit-breakers (SCHCBs) used in low-voltage applications. This international standard applies to equipment with rated voltages up to 1,000 V AC or 1,500 V DC, designed for installation and operation by instructed or skilled persons. The standard ensures consistent performance, safety, and electromagnetic compatibility for advanced circuit protection devices in modern low-voltage electrical systems.

Key Topics

• Types of Semiconductor Circuit-Breakers
  • SCCBs: Utilize semiconductor switching elements, with mechanical isolation contacts connected in series for isolation.
  • SCHCBs: Combine semiconductor and mechanical switching elements in parallel, plus mechanical isolation contacts for isolation.
• Performance and Construction Requirements
  • Addresses performance under normal and abnormal service, including scenarios like overloads and short-circuits.
  • Defines dielectric properties, marking and product information instructions.
  • Specifies constructional features such as clearances, creepage distances, and overall safety requirements.
• Electromagnetic Compatibility (EMC)
  • Outlines detailed EMC requirements, including immunity and emission tests to minimize electrical disturbances and ensure reliable operation.
• Testing Procedures
  • Establishes type, routine, and special testing for performance evaluation and compliance verification.
• Classification Criteria
  • Breakers are classified by type, operation mechanism, installation method, protection direction, maintenance provisions, and more.
• Marking and Documentation
  • Lists requirements for clear product marking and supply of critical installation, operation, and maintenance information.

Applications

This standard is instrumental for a range of professionals including manufacturers, electrical designers, and systems integrators working in:

• Industrial Power Distribution
  • Ensures reliable protection in control panels, automation systems, and factory distribution boards.
• Renewable and Energy Storage Systems
  • Enables safe operation in photovoltaic, battery storage, and inverter-based systems needing advanced protection for both AC and DC circuits.
• Data Centers and IT Infrastructure
  • Supports high-performance, compact, and rapid circuit protection in critical power systems.
• Transport and Mobility
  • Applies to modern rail, marine, and EV charging infrastructure that demands robust low-voltage circuit protection.
• Commercial and Institutional Buildings
  • Enhances safety and decreases downtime with reliable and intelligent circuit-breaking solutions.

Related Standards

SIST EN IEC 60947-10:2026 forms part of the broader IEC 60947 series on low-voltage switchgear and controlgear, ensuring integration and compatibility across protection devices. Other relevant standards include:

• IEC 60947-1: General rules for low-voltage switchgear and controlgear.
• IEC 60947-2: Circuit-breakers for overcurrent protection.
• IEC 60947-3: Switches, disconnectors, and fuse-combination units.
• IEC 60947-4: Contactors and motor-starters.
• IEC 60947-5: Control circuit devices and switching elements.

Compliance with SIST EN IEC 60947-10:2026 supports upgraded safety, performance, and interoperability in low-voltage switchgear and controlgear design by applying unified requirements for semiconductor-based circuit-breakers.

Keywords: IEC 60947-10, semiconductor circuit-breakers, low-voltage switchgear, controlgear standards, SCCB, SCHCB, electrical safety, EMC, industrial power protection, DC circuit-breakers, AC circuit-breakers, electrical standards compliance.