IEC 60050-444:2002 pdf download

IEC 60050-444:2002 pdf download.International Electrotechnical Vocabulary Part 444: Elementary relays
1 Scope
In the past, IEC 60050-446 (Part 446 of the IEV) listed the terminology for all types of electrical relays. In order to improve the precision of terms and definitions as well as the general visibility of relay terminology, it had been decided to split that part of the IEV into three separate parts optimised for the specific relay types covered. Therefore, this part of IEC 60050 gives terms and definitions for elementary relays (non- specified time all-or-nothing relays) superseding the terminology of IEC 60050-446 for such relays. The terminology for time relays is contained in IEC 60050-445 established in parallel with this part. A new part for measuring relays and protection equipment (IEC 60050-447) is also under preparation. When all these three parts are published, IEC 60050-446 shall be withdrawn from the IEV.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60947-1:1999, Low voltage switchgear controlgear – Part 1: General rules IEC 60050-441:1984, International Electrotechnical Vocabulary – Part 441: Switchgear, controlgear, fuses
3 Terms and definitions
NOTE 1 – In this part the simplified term “relay” is used instead of “elementary (non-specified-time all- or-nothing) relay”, except when ambiguity may occur. NOTE 2 – Although this part bears the title ELEMENTARY RELAYS some terms contain the addition “(for elementary relays)”. This is the case when the term has been defined differently in other parts of the IEV. NOTE 3 – Additional terms, concerning isolation, are defined in IEC 60664-1. NOTE 4 – The terms and definitions for time relays and measuring relays are contained in Parts 445 and 447 respectively.