The gate works with both main terminals but one terminal is more sensitive than the other. So if you increase the gate current then the triac will work fine when the terminals are reversed.
Maybe you are thinking about an SCR used for DC, not a Triac used for AC.No. The optotriac has to be connected between T2 and G. Connecting it between T1 and G results in no operation.
As reported, there's an internal low ohmic resistance between G and T1 to prevent self triggering by leakage currents. The triac is triggered by a voltage of typically 0.7 V between G and T1.
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