Triac-Circuit not Latching
I've tested some triacs which seems to work well. Both LEDs light up when the button is pressed.


Good.


  However, when releasing the button the LEDs turn off.


They probably turn off at the end of the half-cycle.







simulate this circuit &ndash; Schematic created using CircuitLab

Figure 1. A low-frequency AC supply with manual alternation.

Connect this to your existing circuit. You'll be able to toggle the supply and hit the test switch and observe the latching operation.