Doug, The voltage rating on "most" circuit breakers is a nominal voltage rating. If the breaker is tested to an EN or IEC standard such as IEC60947-2 then all the testing is performed at a minimum of 105% of rated voltage. UL1077 and UL489 require testing at the rated voltage of the device. Based on circuit breaker design there should be no problem using these breakers on any typical voltage system where the nominal voltage of the system and the nominal voltage of the breaker are the same or where the nominal voltage of the breaker is higher. Using a 250 V breaker at 120 V is no problem. Circuit breakers in general are not voltage sensitive devices, with the obvious exception of shunt trip voltage coils. If you need further info, feel free to email me offline.
John -- John Lach Manager - Standards and Test Carling Technologies Ph: 860-793-7167 Fax:860-747-8329 www.carlingtech.com On 5/7/2004 2:10 PM, POWELL, DOUG <[email protected]> wrote: >Message >All, > >I would like to find out how circuit breakers are rated for line >voltage. I'm certain I know the answer but I need some collaborating >information for a colleague. > >If I have a 250V per phase rated breaker, does this mean that I can >use it on mains up to 250V without regard to 10% high and low line, >or is this an absolute maximum? > >For example: In a 3ph system of 230/400Vac the 10% high line is >253/440Vac. Is this okay? > >Or, theoretically: > >If were such a utility in the world, at 250/433Vac the 10% high line >would be 275/476Vac. Is this okay? > > >thanks, > >-doug >------------------------------------------------- > >Douglas E. Powell, Staff Engineer >Corporate Compliance Dept. >Advanced Energy Industries, Inc. >Fort Collins, CO 80525 USA > > > >********************************************************************** >This email message has been swept by MIMEsweeper for the presence >of computer viruses. >********************************************************************** > >This message, including any attachments, may contain information >that is confidential and proprietary information of Advanced >Energy Industries, Inc. The dissemination, distribution, use >or copying of this message or any of its attachments is >strictly prohibited without the express written consent of >Advanced Energy Industries, Inc. ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. ********************************************************************** 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
