TS IEC 60050-444

TS IEC 60050-444 gathers the terms and definitions used for elementary relays within the International Electrotechnical Vocabulary. It is part of the IEC effort to reorganize relay terminology into more precise, better separated sections, and it focuses on basic all-or-nothing relays that are not defined here by a specific timing characteristic.

Where elementary relays sit in relay terminology

In electrical engineering, relays are switching devices that use a relatively small input quantity to change the state of another circuit. The term “elementary relay” here points to the general relay principle rather than a specialised function: these are non-specified time all-or-nothing relays. That distinction matters because time relays and measuring or protection relays have different operating concepts and therefore need separate terminology to avoid ambiguity in technical communication.

What this part covers and what it separates

• It separates the terminology for elementary relays from the broader relay terminology previously listed in IEC 60050-446.
• It provides terms and definitions for elementary relays.
• Time relays are handled in a different IEV part.
• A separate part for measuring relays and protection equipment is identified as being under preparation.

For engineers, educators, and technical writers, the main value of this vocabulary standard is consistency. Relay families contain closely related but technically distinct concepts, and clear terminology helps keep drawings, specifications, maintenance documents, and training materials aligned.

This is a vocabulary standard rather than a product performance standard. Its purpose is to structure electrotechnical language so that the function and classification of relay types can be described accurately and without overlap.