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I recently bought a few of FOTEK SSR-40DA relays believing that they are 40 A. Anyway I've burned one of then connected to my boiler, and I've opened it, and it turns out that they actually having BTA25 triac inside, which is 25 A.

  • I wonder if I can directly replace it with BTA41 (which is 40A)?
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I believe it is most likely not to having any problems with the replacement looking at the possible chematics and the datasheets.

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    \$\begingroup\$ Welcome to EE.SE. Please be more verbose with your answers and add reasoning to your claims. Thank you. \$\endgroup\$
    – Ariser
    Commented Feb 16, 2020 at 9:42
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Yes, you could {directly replace it with BTA41 (which is 40 41A) and @Transistor is correct, in that you seem to have purchased a cheap, fraud clone, that is one size under its rating.

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