A quick look at the Littlefuse and ST data sheets show both have a linear temperature dissipation of about 1 watt per 1 A continuous RMS current within the amp rating of the device.
If your amp gobbles up 3 amps, then the TRIAC has to dissipate 3 watts and is independent of the current rating of the TRIAC.
If your amp gobbles up 3 amps, then the TRIAC has to dissipate 3 watts and is independent of the current rating of the TRIAC.
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