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Solid state relay question re heat sink size
By domwild, Section Newbies Posted on Fri Dec 14, 2007 at 06:22:20 AM MST
"For max. ratings use: 1 deg C/Watt heatsink?"

Hi,
This message is on the side of a Gordos G280D45 SSR, 280VAC, 45 Amp. Input 3-32VDC. Assuming I wished to drive this relay at its max. rating, what sort of a weight in grams or size should this heatsink be??
Does this mean per watt, the temp is going to climb 1 deg. C ???
Thanks.
Regards,

Solid state relay question re heat sink size | 5 comments (5 topical)

Re: Solid state relay question re heat sink size (3.00 / 0) (#1)
by commanda on Fri Dec 14, 2007 at 12:17:31 AM MST

12.6 KW. What mischief are you up to?

Suggest you go to jaycar.com.au and enter "heatsink" in the search box. Look through what they have available, will give you a good idea.

For instance, a fan type, 105mm wide * 225mm long, is 0.9 degC/watt.
Fan type, 105mm wide * 135mm long, is 1.1 degC/watt.

I think the flat plate formulae are in my voltage regulator book on the bookshelf at work. Google would probably find it.

Amanda

Re: Solid state relay question re heat sink size (3.00 / 0) (#2)
by Flux on Fri Dec 14, 2007 at 02:53:02 AM MST

1 degC/Watt heatsink naturally cooled is big, the biggest thing you see on audio amplifiers and regulated power supplies is not likely to be better than this.

You can get away with less if you fan cool but that is incredibly risky as you will fry if the fan fails.

At that rating you are into an expensive finned extrusion or a monster thing if you fabricate from aluminium sheet and you will need several layers at the centre with the edges folded into fins.

Flux

[ Parent ]

Re: Solid state relay question re heat sink size (3.00 / 0) (#5)
by domwild on Sat Dec 15, 2007 at 02:15:45 AM MST

Thanks Amanda and others,

Will go to Jaycar and look it up. As this relay only cost AUS$10 I could not resist.

Regards,
dom We only ever use the best fencing wire for our repairs!
[ Parent ]

Re: Solid state relay question re heat sink size (3.00 / 0) (#3)
by dinges on Fri Dec 14, 2007 at 03:08:21 AM MST

http://www.epanorama.net/links/basics.html#cooling

Re: Solid state relay question re heat sink size (3.00 / 0) (#4)
by s4w2099 on Fri Dec 14, 2007 at 10:02:22 AM MST

If you cant find one thats big enough maybe you can build it. http://sound.westhost.com/articles/diy-heatsink.htm

Solid state relay question re heat sink size | 5 comments (5 topical)

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