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Old 03-06-2013, 08:45 PM   #1
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Default source for 50 amp ssr?

so, I just melted a 40 amp ssr(my fault - heat sink was too small and no air moving within my panel)I also just installed the new electric line to my garage and now I am running much closer to true 50amp than I was at my last house which was just above 30.

I will be building a new panel soon to account for increased power and safety needs. I was looking for a source for 50 amp ssr's that aren't horribly expensive.

There are some on ebay for under 20 per that come with a heat sink, but there isn't even a manufacturer listed so I am a bit skeptical.
http://compare.ebay.com/like/4003555...Types&var=sbar


Crydom seem to be decent, thermo scientific make them but I don't want to pay 300 for a single ssr.

50 amp control panel, 2 5500w elements, HERMS

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Old 03-06-2013, 09:13 PM   #2
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A single 5500w element draws 23a at 240v. Pardon my lack of knowledge, but why would you need an SSR that's greater than 40a? Are you running both elements from the same SSR? If so, I would instead split both elements and use 2 40A SSR's if possible. I know the Auber PID's can handle up to 5 SSR's in parallel.

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Old 03-06-2013, 09:25 PM   #3
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A single 5500w element draws 23a at 240v. Pardon my lack of knowledge, but why would you need an SSR that's greater than 40a? Are you running both elements from the same SSR? If so, I would instead split both elements and use 2 40A SSR's if possible. I know the Auber PID's can handle up to 5 SSR's in parallel.
because I am dumb and forgot to do my math. no, both elements get their own ssr, I need to look for bigger heat sinks. thanks for setting me straight.
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Old 03-07-2013, 01:07 AM   #4
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I use crydom 40 amp, 240 vac SSRs with ample crydom heatsinks. You can get crydom SSRs cheap on ebay if you are patient. Sometimes you can buy a lot of 5 or 6 used SSRs for a great price. I would rather have a used crydom SSR with one or two back ups than new no-name chinese import SSRs. You want the D2440 (40 amp) or D2450 (50 amp). YMMV.
http://crydom.com/en/Products/Catalog/s_1.pdf
http://crydom.com/en/Products/Catalog/h_s072_assem.pdf

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Old 03-07-2013, 05:46 PM   #5
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You don't need 50A, you just need a properly mounted heat sink and maybe a fan.

No-name Chinese SSRs are usually absolutely fine.

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Old 03-07-2013, 05:55 PM   #6
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No-name Chinese SSRs are usually absolutely fine.
When compared with a name Mexican SSR
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Old 03-07-2013, 06:24 PM   #7
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Yo Dale. I can't even remember the name of my SSRs. Even if they had a name.

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Old 03-07-2013, 06:46 PM   #8
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I had finally mounted all of my electric BK stuff in a small plastic box, rigging the SSR to be inside the box while the Heatsink was positioned outside for air circulation. Everythign was great and I shoveled the drive while it heated up. Got a great boil going and turned down the PWM.... Still boiling. Turned OFF the PWM circuit... Still boiling.

I shut off the breaker and it stopped. I discovered that the heat from the SSR had softened the plastic that I ran the screws through to the SSR, thereby loosening the contact between the heatsink and the SSR. Lesson learned.

Now that the circuit is tested, I'll have better luck once I mount it in a METAL box that won't give way a bit when warmed up.

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Old 03-07-2013, 07:14 PM   #9
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Yo Dale. I can't even remember the name of my SSRs. Even if they had a name.
Hey Tom,
Mine all say 䨀椀洀椀 䠀攀渀搀爀椀砀, which I gotta believe means Crydom in Chinese.

Homercidal, am I reading right that you put heat sink compound on both sides of the plastic, between SSR and heat sink?

I was thinking of mounting mine with SSR on inside, and heat sink outside my metal box, but am worried about the thermal conductivity of the steel between the two.
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Old 03-07-2013, 09:59 PM   #10
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Come on.. The problem is not all that complex.

25A SSR - $15 - Auber Instruments
40A SSR - $19 - Auber Instruments
80A SSR - $32 - Auber Instruments
100A SSR - $40 - Auber Instruments

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