TRIAC simulation broken? [Proteus ISIS]

[18F4520]

Anyone knows why triac simulation only works if you make this circuit:



Instead of the right way:

 

[D.A.(Tony)Stewart]

Check your gate drive currents against TRIAC specs.

Top method has full voltage across opto driver , giving excess current blowing R9

While bottom should work with sufficient drive current at a <<10V then shuts off gate drive then TRIAC latches.

While for med/high drive the following is recommended

 

[18F4520]

Check your gate drive currents against TRIAC specs.

Top method has full voltage across opto driver , giving excess current blowing R9

While bottom should work with sufficient drive current at a <<10V then shuts off gate drive then TRIAC latches.

While for med/high drive the following is recommended
View attachment 115556

Top method was used only for simulation purpose, because otherwise i cannot make simulation works.