Kristiaan In my experience when CBs operate above or close to 40degC, they will potentially operate below the rating trip point, leading to spurious trips. Especially on start up with in rush current. A CB manufacturer should be able to provide you with the devices performance curves, fault current vs time, along with a performance band for working temperature.
>From an approval point of view, the concern is exceeding the temp rating of >the insulation and plastic body. Personally I have never had a problem with the agencies rejecting a CB fitted into a product and sitting in ambient of 50degC. After all a CB a product that does not start because a warm CB keeps tripping, remains fairly safe. Best bet though is to speak to the CB manufacturers. They will know exactly what there products are capable of, and potentially be able to offer you a high temperature version. A search on the UL web site under the CCN codes of QVNU2 or DIVQ, will produce a big list of approved CB manufacturers. [email protected] wrote: > Hello group, > > Circuit breakers and residual current operated circuitbreakers for house-hold > applications are typically cetified at 40 degree Celcius. > If these types are built into other products, they do not comply with their > temperature rating as specified in the safety certificate. > Does any-one know about references to circuit-breakers(230V ac, 10A) that can > work safely at higher temperatures (70...90 degrees) > Regards, > Kris Carpentier > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Michael Garretson: [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: > No longer online until our new server is brought online and the old > messages are imported into the new server. -- Andrew Carson - Product Safety Engineer, Xyratex, UK Phone: +44 (0)23 9249 6855 Fax: +44 (0)23 9249 6014 ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [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: No longer online until our new server is brought online and the old messages are imported into the new server.
