IEC 60050-445:2010

Overview

IEC 60050-445:2010 is part of the International Electrotechnical Vocabulary (IEV) series, issued by the International Electrotechnical Commission (IEC). This standard specifically addresses terminology related to time relays, also known as specified-time relays. The 2010 edition is the second revision, replacing the 2002 version with updated industry-relevant terms and supporting timing diagrams to clarify operational sequences. As a horizontal standard, IEC 60050-445:2010 provides a foundational vocabulary intended for broad application across electrical and electronic fields.

Key Topics

This standard offers a comprehensive framework of definitions and terms covering various aspects of time relays, including:

• Types of time relays: Definitions for common relay types such as power on-delay, power off-delay, flasher relays, star-delta relays, summation time relays, pulse delayed relays, interval relays, watchdog relays, and more.
• Conditions and operations: Clarification of relay states and functional behaviors during energization and de-energization.
• Energization and output circuits: Detailed terminology regarding relay power supply and output configurations.
• Timing definitions: Precise terms defining delay times, pulse times, intervals, and other time-related parameters that govern relay operation.
• Influencing factors and accuracy: Considerations related to errors, environmental influences, and accuracy requirements for reliable relay performance.
• Electromagnetic compatibility: Terminology related to ensuring time relays meet EMC requirements to operate without interference in electrical environments.

The inclusion of timing charts enhances understanding of sequences of operations, providing visual aids alongside standardized terms to assist engineers, technicians, and educators in the electrotechnical industry.

Applications

IEC 60050-445:2010 is essential for professionals working with time relays in various electrical engineering disciplines, including:

• Automation and industrial control systems where time delays regulate equipment functions.
• Protection and monitoring circuits requiring accurate timing operations to safeguard electrical infrastructure.
• Electrical appliance design and manufacturing that incorporate timing relays for functional control.
• Training and education in electrotechnical terminology to ensure consistent communication across global teams.
• Standardization of technical documentation, patents, product specifications, and test procedures involving time relays.

Using this standardized vocabulary supports clear communication across international markets and aids regulatory compliance by unifying terms in the global electrotechnical community.

Related Standards

IEC 60050-445:2010 is part of the larger IEC 60050 series, which encompasses the complete International Electrotechnical Vocabulary covering multiple specializations, such as:

• IEC 60050-441 – General terms for electrical and electronic engineering.
• IEC 60050-441/614 – Relay terminology for electromagnetic and static relays.
• IEC Guide 108 – Horizontal standards guidelines ensuring consistent terminology for electrotechnical standards.

Professionals applying IEC 60050-445 should consider these related parts for a holistic understanding of electrotechnical vocabulary and to ensure accurate application across different devices and fields.

Use of IEC 60050-445:2010 empowers the electrotechnical industry with a precise and internationally accepted vocabulary for time relays – supporting clarity, interoperability, and technological advancement in electrical instrumentation and control systems worldwide.

Keywords: IEC 60050-445, time relays, specified-time relays, international electrotechnical vocabulary, relay terminology, delay relays, electrical engineering standards, IEC horizontal standard, timing diagrams, relay definitions, electrotechnical standardization.