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Joined: Jun 2014
Posts: 139
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dsk Offline OP
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I have loved to use these during the last 25-30 years, and always owersized the ampacity, so did I here to. It was labeled 25A and the max load on the circuit was 9 amp. for several hours.
Nothing else than this and 2 cm of the cables was ruined, but now I will use a contactor (rated 25A) 🙂 More noice more power to energize and hopefully more safe. 🙂

Maybe not only for non US Electrical systems, but this is in Norway at 230V 50Hz banghead

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G
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We have had SSRs for at least 40 years but I am not sure how many were making their way into general industrial use. The good ones came from ISO22 or Crydom. They usually died a quiet death, just not passing current. These white Asian SSRs seem to fail more catastrophically. I have had several blow up. I am not sure whether the SSR blew the motor cap or it was the other way but the SSRs have failed in a similar manner in other applications including resistance heaters.

[Linked Image from gfretwell.com]

These things do not qualify as a "disconnect". They are just used for circuit control.


Greg Fretwell
1 member likes this: dsk
Joined: Jun 2014
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dsk Offline OP
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It was working for quite long, ususally not more than 3 hours continiously, but when it got longer time with constant load the cooling was not good enough, I should prbably had a thermostatic protection... Now I have a contactor the old fashined way, time will show how it works out....

Joined: Jul 2004
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G
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I suspect the triac or an internal connection just went bad. I have had horrible luck with these Asian SSRs. The old ones we used seldom failed and when they did it was quiet, No melting, smoke or fire. The check sorters I worked on in a previous life had about 50 of them in each machine. Everything from 2a to 45a rated. The 2a failed a lot (small shaded pole motor) until they swapped them all for 10a units but it was a quiet failure. I am using them in my spa controller for an 11kw heater (two 5.5kw elements) and the pumps.


Greg Fretwell

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