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From:	"Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject:	[geda-user] Maximum current for thermals?
Message-ID:	<5244f7b5-c5d7-33ec-cd8a-c16d0595d7bb@linetec.nl>
Date:	Wed, 15 Jan 2020 16:47:14 +0100
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Reply-To:	geda-user AT delorie DOT com

Hello,

I have a hopefully simple question: I'm putting a 16A terminal block in 
a ground plane, with Ø 3 mm solder pads and a 1.3 mm hole (0.85 mm 
annulus width), with 0.2 mm clearance. Copper thickness is 0.035 mm 
(~1.5 mil)

Connection with a thermal gives 4 connections with a width of 0.2 mm 
each, same as the clearance. This seems a bit skimpy, so I usually make 
these high-current connections without thermals.

Still, I wonder what the approximate current capacity of these thermals 
is? I know from experience that a few amps is no problem at all, but I'm 
pretty certain that they'll fail upwards of 25A or so. If possible, I 
prefer thermals for easier soldering, so a more accurate estimate of the 
limits would be appreciated.

Best regards,

Richard Rasker

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