I read in !emc-pstc that Ton Bouw <[email protected]> wrote (in <001001c3ca fb$686cf900$fd00a8c0@opticonhlm5183>) about 'Rating of a power adapter' on Thu, 25 Dec 2003: >I have a question for products which an external DC power adapter. >The product is supplied with a DC power adapter which is current limited, >provides overload and short circuit protection and is specified to accept an >overload or short circuit condition continuously. > >Assuming that the rated current for a product is 1.0A, and assuming that the >fuse rating is determined at 1.5A, then a rating of the power adapter of >anything over 1.0A would seem to be sufficient for operation and protection. >However if the rating of the power adapter does not exceed 1.5A, the fuse would >probably never blow. Is this acceptable? Is there a rule of thumb for >the rating of a fuse and for a power adapter?
A product that uses a power adaptor with the specification you give doesn't *need* a fuse. If you are concerned that someone might connect a different power supply, use a non-standard power connector. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Interested in professional sound reinforcement and distribution? Then go to http://www.isce.org.uk PLEASE do NOT copy news posts to me by E-MAIL! This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ieee-pses.org/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
