what i have seen in the X-10 units (very cost sensitive and UL approved)
is 2 pads and a very fine wire soldered in
don't know if the wire is special
i appeared (by eyeball measurement) to be 28 or 30 AWG
Dennis Saputelli
_______________________________________________________________________
Integrated Controls, Inc. Tel: 415-647-0480 EXT 107
2851 21st Street Fax: 415-647-3003
San Francisco, CA 94110 www.integratedcontrolsinc.com
Butcher, Bob wrote:
Thanks for the reference, that is just what I needed. I am pushing for a
real fuse, but may be forced to add a fusible link to the PCB due to the
excessive cost of a 14 cent surface mount fuse!
Bob
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Brad Velander
Sent: Friday, November 04, 2005 10:48 AM
To: Protel EDA Discussion List
Subject: RE: [PEDA] How do I design a fusible link into a PCB?
Bob,
If you have not already found it, check out WWW.ULTRACAD.COM
Doug Brooks has studied and written several articles on this
subject. >From my own personal experience many many years ago, the
fusible link is not very reliable. It is only good as an absolute
disaster stopping link that may blow at 3 amps or may not blow until you
reach 10 amps (we were trying to make it a 3 amp link). It may hang in
there for 3 minutes at 8 amps as well. So don't expect any fine
tunability, too many variables and variances for great accuracy.
Sincerely,
Brad Velander
Senior PCB Designer
Northern Airborne Technology
#14 - 1925 Kirschner Road,
Kelowna, BC, V1Y 4N7.
tel (250) 763-2329 ext. 225
fax (250) 762-3374
-----Original Message-----
From: Butcher, Bob [mailto:[EMAIL PROTECTED]
Sent: Friday, November 04, 2005 9:30 AM
To: [email protected]
Subject: [PEDA] How do I design a fusible link into a PCB?
I want to add a narrow circuit trace to a PCB design to act as a fuse.
It should operate with 1 Amp of current continuously and open if the
current exceeds a higher value (2-5 Amp). This project is very cost
sensitive and a 15 cent fuse may be too much. I have the guidelines for
conductor heating vs cross section, and it appears the conductor would
need to be less than 10 mils wide on a 1 Oz copper board. Does anyone
have experience with this subject?
Bob Butcher
[EMAIL PROTECTED]
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