IEC 60947-10:2026

Overview

IEC 60947-10:2026 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies requirements for low-voltage switchgear and controlgear, focusing on semiconductor circuit-breakers. This Part 10 of the IEC 60947 series applies to devices operating at rated voltages up to 1,000 V AC or 1,500 V DC, and intended for installation and use by instructed or skilled personnel. The standard covers both semiconductor circuit-breakers (SCCBs) with semiconductor elements and serial mechanical isolation contacts, and semiconductor hybrid circuit-breakers (SCHCBs) featuring parallel configurations of semiconductor and mechanical switching elements, with mechanical isolation contacts for disconnection.

This document helps ensure the safety, performance, and reliability of semiconductor circuit-breakers across various low-voltage applications worldwide.

Key Topics

IEC 60947-10:2026 addresses several core aspects, including:

• Product Requirements: Defines characteristics for semiconductor circuit-breakers and hybrid circuit-breakers regardless of construction or intended application.
• Operational Conditions: Specifies compliance with performance in normal operation, as well as during abnormal situations such as overloads and short-circuit events.
• Isolation and Switching: Details requirements for isolation functionality, including the use of mechanical isolation contacts.
• Dielectric and Electromagnetic Performance: Stipulates necessary dielectric properties and mandates electromagnetic compatibility (EMC) requirements.
• Testing and Verification: Describes standard type tests, routine tests, and special tests to verify compliance with design and performance requirements.
• Information and Marking: Outlines necessary data, labeling, and product information to be provided for correct installation, operation, and maintenance.

Applications

Semiconductor circuit-breakers in line with IEC 60947-10:2026 are utilized in a wide range of low-voltage electrical systems, notably in:

• Industrial Control Panels: Where fast and reliable circuit protection is essential for automation and process equipment.
• Renewable Energy Systems: For example, in photovoltaic and battery storage installations requiring rapid response to faults.
• Railway and Transport: Protecting DC and AC low-voltage networks within rolling stock and infrastructure.
• Data Centers and IT Facilities: Ensuring high-speed circuit interruption in critical power distribution units.
• Building Electrical Installations: Applied in commercial and institutional facilities for advanced protection in smart electrical panels.

These circuit-breakers offer advantages such as enhanced arc-less interruption, reduced maintenance needs, and improved operation speed compared to traditional mechanical circuit-breakers.

Related Standards

IEC 60947-10:2026 is part of the broader IEC 60947 series on low-voltage switchgear and controlgear. Complementary standards in this field include:

• 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 60947-4-1: Contactors and motor-starters
• IEC 60947-5-1: Control circuit devices and switching elements

These related standards together form a comprehensive framework for specifying, testing, and certifying electrical protection and switching devices for low-voltage applications.

Practical Value

By adhering to IEC 60947-10:2026, manufacturers, system integrators, and end-users benefit from:

• Global Acceptance: Products designed to this standard are recognized internationally, supporting market access and interoperability.
• Enhanced Safety: Comprehensive test and marking requirements promote safe installation and reliable operation.
• Performance Assurance: Rigorous testing ensures that devices function as intended under both normal and fault conditions.
• Compliance and Quality: Aligns with contemporary requirements for electromagnetic compatibility and system reliability.

Implementing products that conform to IEC 60947-10:2026 helps ensure protection and continuity for modern electrical systems employing semiconductor-based circuit protection.