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You may want to consider using the fuses outside their rating. If you can show the fuse is not needed for safety purposes by bypassing the fuse during safety tests, and show that if the fuse does operate, no hazard results (this may be an issue with high DC currents which are hard to interrupt), then choice of the fuse and fuseholder is simply a functional consideration. Similarly, you may be able to show that the fuse performs its safety reliably in application, even though your application is outside normal component ratings. Testing to justify such a stance would be necessary.
Bob Johnson ITE Safety From: [email protected] [mailto:[email protected]] On Behalf Of Chris Maxwell Sent: Wednesday, February 12, 2003 10:08 AM To: EMC-PSTC Internet Forum Subject: Fuse Holders Hi all, I have a design that has a 36 to 72 VDC input rated for up to 14 Amps. I've looked at the standard 5x20mm and 6x32mm fuseholders that we have; and they are rated for 6.3 Amps (SEMKO) 10 Amps (VDE) and 16 Amps (UL). Of course these fuseholders are also rated for up to 250VAC. What I like about the standard fuseholders is the fact that they solder to a PCB with a "right angle" footprint. That is, the PCB can be perpendicular to the panel that the fuses stick out through. We can then design the panel to allow the fuses to protrude; which would allow for safe and convenient user replacement of fuses. Problem is, their current rating is insufficient. Can anybody recommend a fuse-holder that is a right angle PCB mount that will handle the voltages and currents that I'm suggesting above? It would be alright if we need to use a different style of fuse. What is important to me is: current and voltage rating, low form factor, right angle PCB mount and ease of user replacement. I would like to avoid fuseholders that require cable mounting; I want them to solder to the PCB. As a fallback position, I have considered using two of the above fuseholders in parallel with 7.5 Amp fuses installed. Can anybody see a compliance problem with this (considering EN 61010-1).? Thanks for your collective time. Chris Maxwell | Design Engineer - Optical Division email [email protected] | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | 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: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstcTitle: RE: Fuse Holders
You may want to consider using the fuses outside their rating.
If you can show the fuse is not needed for safety purposes by bypassing the
fuse during safety tests, and show that if the fuse does operate, no hazard
results (this may be an issue with high DC currents which are hard to
interrupt), then choice of the fuse and fuseholder is simply a functional
consideration.
Similarly, you may be able to show that the fuse performs its safety
reliably in application, even though your application is outside normal
component ratings. Testing to justify such a stance would be necessary.
Bob Johnson
ITE Safety
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Chris Maxwell
Sent: Wednesday, February 12, 2003 10:08 AM
To: EMC-PSTC Internet Forum
Subject: Fuse Holders
Hi all,
I have a design that has a 36 to 72 VDC input rated for up to 14 Amps.
I've looked at the standard 5x20mm and 6x32mm fuseholders that we have; and
they are rated for 6.3 Amps (SEMKO) 10 Amps (VDE) and 16 Amps (UL). Of
course these fuseholders are also rated for up to 250VAC.
What I like about the standard fuseholders is the fact that they solder to a
PCB with a "right angle" footprint. That is, the PCB can be perpendicular
to the panel that the fuses stick out through. We can then design the panel
to allow the fuses to protrude; which would allow for safe and convenient
user replacement of fuses.
Problem is, their current rating is insufficient.
Can anybody recommend a fuse-holder that is a right angle PCB mount that
will handle the voltages and currents that I'm suggesting above? It would
be alright if we need to use a different style of fuse. What is important
to me is: current and voltage rating, low form factor, right angle PCB
mount and ease of user replacement. I would like to avoid fuseholders that
require cable mounting; I want them to solder to the PCB.
As a fallback position, I have considered using two of the above fuseholders
in parallel with 7.5 Amp fuses installed. Can anybody see a compliance
problem with this (considering EN 61010-1).?
Thanks for your collective time.
Chris Maxwell | Design Engineer - Optical Division
email [email protected] | dir +1 315 266 5128 | fax +1 315 797 8024
NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA
web www.nettest.com | tel +1 315 797 4449 |
-------------------------------------------
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:
Ron Pickard: [email protected]
Dave Heald: [email protected]
For policy questions, send mail to:
Richard Nute: [email protected]
Jim Bacher: [email protected]
Archive is being moved, we will announce when it is back on-line.
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
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