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Circuit protection device symbols

British Electrotechnical and Allied Manufacturers' Associations, 2024

Document Status

Current

Supplement

Mechanical & Electrical Supplement

Abstract

This standard provides comprehensive guidelines for the key markings required on circuit protection devices, including Miniature Circuit Breakers (MCBs), Residual Current Circuit Breakers (RCCBs), and Residual Current Circuit Breakers with Overcurrent protection (RCBOs). It emphasizes the importance of durable markings for manufacturer’s name, type, catalogue or serial number, rated voltage(s), rated current, rated residual operating current (IΔn), energy limiting class, and operating characteristics, ensuring that these devices are safe, reliable, and compliant with regulations.

History

First published 1st August 2024.

Subjects

Electrical services
Electric/electronic safety related systems
Building services

Publisher History

BEAMA represents the electrotechnical industry for the UK, supporting manufacturers of electrical infrastructure products and systems from transmission through distribution to the environmental services in the built environment.

Information

NBS

NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.

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