Thanks Scott. My stuff is electronic with no mothers etc, just input filter caps and inductors. The manufacturer gives various trip curves and they address just these issues. So I think I am covered on that. These seem to be a bit pricey if you ask me so I am going to look at the thermals as well, but these are for outdoor boxes with sun loading and all of that. So heat is a concern - but then seems to be alot of industrial equipment made by others that would fall into the outdoor category as well, so I may be a bit over cautious here. The search goes on. Thanks for the input Gary
-----Original Message----- From: Scott Lacey [mailto:sco...@world.std.com] Sent: Sunday, October 21, 2001 6:09 AM To: Gary McInturff Cc: emc-p...@ieee.org Subject: RE: high temperature circuit breaker Gary, Kris, If these are indeed magnetic breakers, one point of caution should be advised. An ordinary magnetic breaker is very sensitive to high inrush currents from motors and transformers. They will often trip from these (normal) inrush currents. In such cases a motor rated version needs to be specified. They have additional damping to delay response time. Scott Lacey -----Original Message----- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Gary McInturff Sent: Friday, October 19, 2001 1:36 PM To: 'kristiaan.carpent...@alcatel.be'; emc-p...@majordomo.ieee.org Subject: RE: high temperature circuit breaker Neither endorsing or rejecting these breakers I just happen to be doing a little research of my own and have a spec sheet open in front of me on these things. Square D has a Multi-9 series of breakers that shows an operating temperature of -30 to -70 C. and tropical treatment 2 for 95% rh of 95% at 55C. I haven't looked any further to see if they are Listed/Certified to those temperatures or if those are just the marketing numbers so you'll want to follow-up on that. They have a wider range of amperage ratings than the others I have quickly reviewed. I happen to be looking at a 2 amp breaker and typically those have only been Listed for Supplemental Protectors rather than Branch Circuit protection. You also want to consider whether they are thermal or magnetic breakers. If your worried about high temperatures you probably want to look at the magnetic breakers because they are less heat sensitive. Here is a link http://www.squared.com/us/products/circuit_breakers.nsf/unid/B7E8BB545346010 D85256AA30051A705/$file/multi9ul489breakersFrameset.htm Good luck Gary -----Original Message----- From: kristiaan.carpent...@alcatel.be [mailto:kristiaan.carpent...@alcatel.be] Sent: Friday, October 19, 2001 7:24 AM To: emc-p...@majordomo.ieee.org Subject: high temperature circuitbreaker 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. 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