EN IEC 60947-10:2026

Overview

EN IEC 60947-10:2026, published by CLC, specifies requirements for semiconductor circuit-breakers (SCCBs) and semiconductor hybrid circuit-breakers (SCHCBs) for use in low-voltage switchgear and controlgear assemblies. This standard applies to devices with rated voltages up to 1,000 V AC or 1,500 V DC and is intended for installation and operation by instructed or skilled persons. It details characteristics, operational behaviors, dielectric properties, electromagnetic compatibility, testing, and marking requirements for these types of circuit-breakers, regardless of their rated currents, methods of construction, or proposed applications.

Semiconductor circuit-breakers utilize modern solid-state technology to provide rapid and reliable interruption of electrical circuits, while hybrid versions combine both mechanical and semiconductor components for enhanced performance and flexibility.

Key Topics

• Scope of Application
  • SCCBs and SCHCBs up to 1,000 V AC/1,500 V DC
  • Devices installed by trained personnel in a variety of low-voltage power systems
• Classification
  • By type, operation mechanism, fault response, isolation method, installation, and communication
  • Special focus on directional protection and surge withstand capabilities
• Characteristics
  • Electrical ratings: voltage, current, frequency, duty cycle, short-circuit capacity
  • Integration with auxiliary and control circuits
  • Isolation function and safety features for the operator
  • Degree of protection provided by enclosure (IP rating)
• Performance Requirements
  • Normal and abnormal service conditions, including overload and short-circuit performance
  • Dielectric properties and temperature-rise limitations
  • Electromagnetic compatibility (EMC) and environmental considerations
• Testing Requirements
  • Type, routine, and special tests for confirming compliance
  • Sequences focused on performance, safety, mechanical operation, and EMC
• Product Information and Marking
  • Clear marking and product information to ensure proper selection, installation, and maintenance
  • Instructions provided for installation, operation, maintenance, decommissioning, and dismantling

Applications

EN IEC 60947-10:2026 supports a wide range of low-voltage electrical infrastructure across multiple sectors where reliable circuit protection and fast switching are critical. Key application areas include:

• Power Distribution Panels: Rapid circuit interruption to protect electrical distribution systems in commercial and industrial settings
• Renewable Energy Systems: Used in photovoltaic (PV) and battery energy storage systems (BESS), where fast disconnection and current direction control are essential
• Electric Vehicle Charging: Ensures safety and reliability in AC and DC charging solutions
• Industrial Automation: Integrated within motor control centers and process industry equipment for dependable power management
• Critical Infrastructure: Data centers, telecommunications, and transport networks benefit from the high speed and reliability of SCCBs and SCHCBs

The standard also addresses contemporary needs for digital communication, software upgrades, and integration with programmable logic controllers (PLCs), making it relevant for modern smart grid and Industry 4.0 environments.

Related Standards

• IEC 60947-1: General rules for low-voltage switchgear and controlgear
• IEC 60947-2: Circuit-breakers
• IEC 60947-3: Switches, disconnectors, switch-disconnectors, and fuse-combination units
• IEC 61643 Series: Low-voltage surge protective devices
• IEC 61000 Series: Electromagnetic compatibility (EMC) standards

EN IEC 60947-10:2026 complements these core standards by addressing the specific characteristics and requirements of semiconductor and hybrid circuit-breakers, supporting the further evolution of safe, efficient, and digital-ready low-voltage electrical installations.

Keywords: low-voltage switchgear, controlgear, semiconductor circuit-breakers, SCCB, SCHCB, industrial safety, power distribution, IEC 60947-10, electromagnetic compatibility, short-circuit protection, smart grid, CLC, electrical standards