Mike I believe that you will find the international markings in one of the parts of IEC60127 (was IEC127).
Although I have'nt got the standards to hand, and if I remember correctly, typically these markings are: "FF" = Very Fast "F" = Fast/Normal "T" = Slow/Time Delay/Slow-Blo "TT" = Very Slow Thus typical ratings could be: - T3.15A + voltage rating for a time-delay fuse - F3.15A + voltage rating for a fast/normal blow fuse. By comparison, USA fuses tend to be marked with the words (in "American" English!). There also some special fuses around for semiconductor protection - butI cannot remember the details. Fuseholder markings must match fuse-ratings if in an Operator-accessible area. Also bear in mind that the marked ratings of fuses to UL/Canadian standards and IEC standards are often different (e.g 3A USA v 3.15A IEC) and they have different blow characteristics - follow some of the earlier threads on the RCIC forum for more information. John Allen THALES Defence Ltd Bracknell, UK -----Original Message----- From: Davis, Mike [mailto:[email protected]] Sent: 25 January 2001 16:09 To: EMC-PSTC Regulatory E-Mail (E-mail) Subject: Fuse Markings I am in the process of updating markings for power ratings on a product that needs a marking for a FAST blow fuse. Is there a reference out there that shows the letter designations for the various blow open speeds? I looked in the IEC 417 and in UL1950 3rd edition to no avail. The search goes on. Michael S. Davis Compliance Engineer ADC BATG Compliance Engineering Tel: 203 630-5788 Fax: 203 630-5762 [email protected] Learn about ADC - The Broadband Company at www.adc.com ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
