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Topic: SSR on Ebay (Read 1 time) previous topic - next topic

DavidC

Just got 36 25A solid state relays on ebay for $74. Great deal. Merry Christmas to me.  :)  Now what to do with them?  :-/

retrolefty

Nice price. Keep in mind to utilize the maximum 25 amp current rating requires quite the heatsink, that's why they have smooth metal backings.

Lefty


pwillard

Really!  During a stress test of my 2000F Degree Kiln, I managed to produce an amazing amount if heat in the SSR while tuning PID parameters.  (all within spec... but right to the SSR limit) Yes, I had a large heat sink.  It was HOT.

cr0sh

Quote
Just got 36 25A solid state relays on ebay for $74. Great deal. Merry Christmas to me.  Now what to do with them?


Heh - I'm kinda in the same boat; a couple of weekends ago I went to a local hamfest and bought a large heatsink with 16 25A SSRs mounted on them (each with a varistor across the outputs) in a 4x4 pattern. Got it for $35.00; have no clue what I'll do with them (but I couldn't pass up the deal!)...

;D
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

retrolefty

DIY nuclear reactor?


bld

captain-slow.dk | non contagious!

DavidC

    A nuclear reactor to power lasers. I like it!!!! Now where did I put that plutonium?

retrolefty

#7
Dec 16, 2010, 12:34 am Last Edit: Dec 16, 2010, 12:36 am by retrolefty Reason: 1
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I would surely like to find some that did NOT have automatic zero-crossing switching.


Well all scr/triac based SSR are going to be zero-crossing switching from on to off state as that is the only way to turn off a triggered and conducting scr. However the the turn-on can be either random or zero based I guess on the design of the triggering circuit of the device. Not sure if it is always clearly stated in many SSR datasheets or not what the turn-on charactristic are of the device. I would assume that lots of high power random switching would generate a lot of harmonic garbage in the local power wiring?

Lefty

thegeekway

The flat metal on SSRs, is it just for heatsinks and is it usually isolated.  Got a plug socket to modify ;)

retrolefty

#9
Dec 16, 2010, 07:25 pm Last Edit: Dec 16, 2010, 07:25 pm by retrolefty Reason: 1
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The flat metal on SSRs, is it just for heatsinks and is it usually isolated.

Yes to both. Use heatsink paste for best results.




Pokey

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But the 0.1% of us wanting to do phase-angle dimming need the kind WITHOUT the zero-crossing circuitry.


Is this what you are looking for?:

http://www.alliedelec.com/search/productdetail.aspx?SKU=6820149

I am interested in making a phase-angle controller for a split-phase motor, so I would like to know more about this.

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