Triac and direct current?

Question

Arduino

I can not figure out how to close the triac. The bottom line is - there is a triac and a load. Everywhere is a constant, an arduino drives a triac. Opening is not a problem, but how to close it ?. You need to close as soon as possible.
Why a triac - because there is nothing else at hand for the required power, but it needs to be done urgently.
Why is it not a relay - the minimum load off time is critical + there will be an arc on the contacts when opening + the contacts can burn stupidly - this cannot be allowed.

Answer 1

The triac is for that and the triac, which closes its change.
I do not believe that there is no IGBT for your power.

Answer 2

The triac / thyristor is closed by reducing the passing current below a given level for a time not less than a certain time (so that the charges in the blocking layer have time to dissolve). For a thyristor, a change in the polarity of the flowing current is also suitable, since when crossing zero, the above condition for reducing the current for a certain time will be fulfilled. Before the advent of switchable thyristors, it was necessary to build special switching circuits, when a capacitor with a charge of the opposite polarity was discharged onto an open thyristor (to create a short-term closing current equal to at least the load current). But I don’t know how the polarity change with the triac works, there is a suspicion that it won’t work. Maybe, if the current is constant, then return from the triac to the thyristor? Then this simple switch circuit will do:
The left thyristor and Rl are the load circuit, the right one (or transistor) is the switch. I made this circuit myself, it works fine with the right choice of elements.

Answer 3

different triacs are
3 quadrant closed by a pulse of reverse polarity, 4 quadrant do not close at all except for a decrease in the cathode current, below the holding current in the absence of gate current.
forget about it as quickly as possible - the speed of opening and closing is registered in the datasheet, speeding ends with burnout.