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Author Topic: SSR on Ebay  (Read 1486 times)
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Tucson, Az
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Just got 36 25A solid state relays on ebay for $74. Great deal. Merry Christmas to me.  smiley  Now what to do with them?  :-/
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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

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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.
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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
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DIY nuclear reactor?

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Vejen, Denmark
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To power lasers!
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     A nuclear reactor to power lasers. I like it!!!! Now where did I put that plutonium?
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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
« Last Edit: December 15, 2010, 06:36:05 pm by retrolefty » Logged

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



« Last Edit: December 16, 2010, 01:25:35 pm by retrolefty » Logged

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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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