RE: Transient Voltage Suppressor - Europe approvals?
All: You are correct, but this is generally due to the cost of the TVS diode and the MOV, not the capability. Dave -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Peters, Michael Sent: Wednesday, June 19, 2002 1:51 PM To: Peters, Michael; 'emc-p...@majordomo.ieee.org' Subject: RE: Transient Voltage Suppressor - Europe approvals? I want to thank all those who replied for their responses. We have a lot to think over. To answer questions posed: The concept is to find an alternative to MOVs for surge protection. The attraction to the Transient Voltage Suppressors is their reliability and current clamping characteristics. General Semiconductor (now Vishay) does have a few mains rated, UL approved TVSs. They are rated to 120 VAC which doesn't make them useful for European voltages. The engineer I spoke with for Vishay informed me that they are contemplating UL approvals for their 400 and 440 TVSs up to those voltages. Based on the response, TVSs do not appear to be a popular method of transient protection on the power line. Thanks again, Michael Peters -Original Message- From: Peters, Michael Sent: Wednesday, June 19, 2002 9:33 AM To: 'emc-p...@majordomo.ieee.org' Subject: Transient Voltage Suppressor - Europe approvals? Greetings, Is anyone aware of Transient Voltage Suppressors (General Semiconductor calls them TransZorbs) with any European safety approvals (Semko, Demko, VDE, etc.,)? They would need to be rated for mains voltage. Thanks, Michael Peters --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
RE: Transient Voltage Suppressor - Europe approvals?
JPR: But remember Energy is the factor of Current, Voltage, and Time. From a protection stand-point, TVS components divert currents and clamp voltages. It is for this reason that they are used in the circuit, system. Of course for best results lower clamping voltage is desired. If the current is the same and the waveform the same, the voltage for a TVS diode is lower the energy is also lower, but who cares at least the circuit/system is protected. Dave -Original Message- From: j...@aol.com [mailto:j...@aol.com] Sent: Wednesday, June 19, 2002 11:08 AM To: hutch...@protek-tvs.com; robert_wil...@tirsys.com; mpet...@analogic.com; emc-p...@majordomo.ieee.org Subject: Re: Transient Voltage Suppressor - Europe approvals? In a message dated 6/19/2002, Dave Hutchins writes: Energy has nothing to do with the capability of the TVS device. It is also proven that the energy in the transient threat is not the energy dissipated in the TVS component, just ask any old timer even those at Harris. Hi Dave: I'm not sure I agree with you on this one, but perhaps the issue is simply one of semantics. The energy I referred to was the energy in the surge, not the protection device. For example, a gas tube can handle, without damage, surges of far higher energy than a Transzorb. If I recall correctly, MOVs can also typically handle surges of higher energy than a Transzorb. In the past, when I have used a Transzorb or comparable device, it was for tertiary protection inside a circuit that was already protected by other devices with the ability to handle much higher energy surges. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 http://www.randolph-telecom.com
RE: Transient Voltage Suppressor - Europe approvals?
Hello: The question is not the energy handling capability, it is a matter of cost. You can purchase a TVS diode that has the same energy handling capability of the MOV, but the cost is much different. By the way, energy is not a good measure of the capability of a TVS component. The TransZorb has a lower clamping voltage than an MOV for the same peak pulse current and waveform. Therefore the calculated energy is lower in the TransZorb. Energy has nothing to do with the capability of the TVS device. It is also proven that the energy in the transient threat is not the energy dissipated in the TVS component, just ask any old timer even those at Harris. Dave -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of j...@aol.com Sent: Wednesday, June 19, 2002 9:51 AM To: robert_wil...@tirsys.com; mpet...@analogic.com; emc-p...@majordomo.ieee.org Subject: Re: Transient Voltage Suppressor - Europe approvals? In a message dated 6/19/2002, Bob Wilson writes: Transzorbs (or TVSs) are basically zener diodes that are rated for their energy absorption capability. Hello All: One thing to keep in mind is that the energy handling capability of a TransZorb is generally not very high compared to other devices such as gas tubes, MOV's, and sidactors. Michael, your original posting did not specify the intended application, but the reference to being rated for mains voltage makes me wonder if you are trying to protect from surges on an AC mains input. If so, I do not think that a TransZorb would have adequate energy handling capability. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 http://www.randolph-telecom.com
RE: Transient Voltage Suppressor - Europe approvals?
Michael: I worked at General Semiconductor for about 25 years. I do not know of any specific component safety standard for TVS diode components. The one that we, when at General Semiconductor, had to meet was the UL 497B for telecommunications. Generally, there is no safety standard for individual components. It depends on how they are connected in the circuit and their location, that is for creepage and clearance distances. These components are used on AC power, DC power and data lines. Their selection depends upon specific applications and the peak pulse current and waveform. These two conditions are the only threat conditions that are important. But it is location of the device in the circuit or system that might cause of concern for safety. Dave -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Peters, Michael Sent: Wednesday, June 19, 2002 6:33 AM To: 'emc-p...@majordomo.ieee.org' Subject: Transient Voltage Suppressor - Europe approvals? Greetings, Is anyone aware of Transient Voltage Suppressors (General Semiconductor calls them TransZorbs) with any European safety approvals (Semko, Demko, VDE, etc.,)? They would need to be rated for mains voltage. Thanks, Michael Peters --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on browse and then emc-pstc mailing list
Bellcore 1092
Can anyone tell me where I can obtain this document. What I really need is the is the conditions of the ring wave from this document. Can anyone help me on this? Best Regards David W. Hutchins Director: World Wide Marketing Applications ProTek Devices 2929 S. Fair Lane Tempe, AZ 85282 USA Direct Dial: 602-414-5101 Company Phone: 602-431-8101 FAX: 602-431-2288 e-mail: hutch...@protek-tvs.com Web: http://www.protecdevices.com --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org 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.
CE Mark for AC Power Line Protection Module
Dose anyone know what directive or EN standard is required for applying the CE mark to an AC Power Line Protection Module. B. Rgds. David W. Hutchins Director World Wide Marketing Applications Fax: 602-431-2288 Tel: (direct) 602-414-5107 eFax 509-752-0049 ProTek Devices e-mail: hutch...@protek-tvs.com 2929 S. Fair Lane Web Site: http://www.protek-tvs.com Tempe, AZ 85282Hotmail: dhutchin...@hotmail.com --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
RE: Application of equipment in U.S. aircraft
All: Can anyone tell me where I can get some devices tested to DO-160C or D? David Hutchins ProTek Devices hutch...@protek-tvs.com -Original Message- From: Price, Ed [SMTP:ed.pr...@cubic.com] Sent: Monday, February 26, 2001 9:34 AM To: 'Dan Kinney (A)'; Emc-Pstc (E-mail) Cc: Roy Lowery (A); Brian Stuckey (A) Subject:RE: Application of equipment in U.S. aircraft Dan: Look at RTCA DO-160D for US commercial aircraft. I think that the FAA also has a flock of interface standards that might have some relevance. Ed Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 858-505-2780 (Voice) 858-505-1583 (Fax) Military Avionics EMC Services Is Our Specialty Shake-Bake-Shock - Metrology - Reliability Analysis -Original Message- From: Dan Kinney (A) [mailto:dan.kin...@heapg.com] Sent: Monday, February 26, 2001 6:07 AM To: Emc-Pstc (E-mail) Cc: Roy Lowery (A); Brian Stuckey (A) Subject: Application of equipment in U.S. aircraft We have a possible application of some of our equipment for engine control of crop dusting aircraft. We have never had our equipment used on aircraft before (to our knowledge) thus don't know if there are any regulatory issues we need to concern ourselves with. The application is for use in the U.S., at least initially. Our equipment presently complies with the EMC Directive for ISM and is UL approved for Hazardous Locations. It would stand to reason there would be additional requirements for any application involving aircraft but we don't know if this might be an issue between the installer and the FAA or an issue for us to be concerned and involved with. My request might be a little off topic for this group, but if anyone can point me in the right direction, I would appreciate it. Dan Kinney --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall, --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall, --- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
