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.