IEC 60050-445:2010 pdf download – International Electrotechnical Vocabulary – Part 445: Time relays
1 Scope This part of IEC 60050 defines terms related to specified-time relays. 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 (specified) time relays superseding the terminology of IEC 60050-446 for such relays. The terminology for elementary relays (non-specified time all-or-nothing relays) is contained in IEC 60050-444. A new part for measuring relays (IEC 60050-447) is also under preparation. When all these three parts are published, IEC 60050-446 shall be withdrawn. This standard is intended to define the most common time relay functions, and not all possible combinations.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC Guide 1 08, Guidelines for ensuring the coherency of IEC publications – Application of horizontal standards
445-01 -04 relais temporisé à la coupure avec signal de commande, m relais temporisé dans lequel la sortie passe immédiatement à l’état de travail lorsque l’alimentation et le signal de commande sont appliqués, la temporisation démarre lorsque le signal de commande est coupé, et la sortie passe à l’état de repos lorsque la temporisation réglée est écoulée (voir Figure 3) NOTE Il convient que les effets de manœuvres ou réamorçages subséquents sur le comportement du relais soient spécifiés par le fabricant. off-delay relay with control signal off-delay relay time relay in which the output immediately switches to the operate condition when applying the power supply and the control signal; the time delay starts when removing the control signal, and the output switches to the release condition after the setting time has elapsed (see Figure 3) NOTE Effects of subsequent operating or resetting of the control signal shall be declared by the manufacturer.
