Hello Lauren,
I am not sure about UL voiding due to operating outside of its parameters. What circuit breaker is it ? What application is it Assuming a standard Thermo Magnetic device (TMD) At 50 Degrees C the breaker would trip faster at this elevated temperature due to the Heating effects A lot of this is listed in EN61439-1 - switchgear coordination. If you look at the circuit breaker in question, they have tripping curves at the rear of the data sheet. Look at the "HOT" tripping curve and temperature de-rating section also found in the data sheet. Regards Steve Clarke Test Engineer Unit 3 Compliance Ltd EMC : Electrical Safety : Environmental & Vibration : CE & UKCA : Consultancy www.unit3compliance.co.uk <http://www.unit3compliance.co.uk/> | step...@unit3compliance.co.uk <mailto:step...@unit3compliance.co.uk> | +44(0)1274 911747 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 From: Lauren Crane <00001afd08519f18-dmarc-requ...@listserv.ieee.org> Sent: Saturday, January 6, 2024 12:48 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] Is certification 'voided' by improper operational conditions? Hello Experts, If I have UL certified component and operate it for a period of time outside its specified conditions of operation, and then return the conditions to specified levels, is it appropriate to still think of the component as certified, or is the certification somehow voided by this accident? For example, a circuit breaker rated for 40degC max ambient run at 50degC ambient for 8 hours and then ambient temp brought down to 30degC. Best Regards, -Lauren Happy to receive recall-opinions and educated guesses but would love 'chapter and verse' citations if available. LAM RESEARCH CONFIDENTIALITY NOTICE: This e-mail transmission, and any documents, files, or previous e-mail messages attached to it, (collectively, "E-mail Transmission") may be subject to one or more of the following based on the associated sensitivity level: E-mail Transmission (i) contains confidential information, (ii) is prohibited from distribution outside of Lam, and/or (iii) is intended solely for and restricted to the specified recipient(s). If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you are hereby notified that any disclosure, copying, distribution or use of any of the information contained in or attached to this message is STRICTLY PROHIBITED. If you have received this transmission in error, please immediately notify the sender and destroy the original transmission and its attachments without reading them or saving them to disk. Thank you. Confidential - Limited Access and Use _____ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ <https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20> Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net <mailto:msherma...@comcast.net> Rick Linford at: linf...@ieee.org <mailto:linf...@ieee.org> For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org <mailto:j.bac...@ieee.org> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
