Power thyristor with fine wire trigger, the rest resembles the diode (mounting ...)
Here a double thyristor (for mixed bridge ...) 2 triggers up
Sole of the module to be attached to a heatsink
The thyristor is in series with the lamp to control it
The potentiometer will make it possible to control the trigger current of the thyristor
Trigger intensity (red ammeter on the right) increases
Shortly after 2.4 mA: tripping
When the thyristor conducts, the intensity in the trigger decreases and reverses
Maintaining Ig trigger is useless. To cut, the power supply must be interrupted
By proceeding slowly we measured almost 7 mA to trigger it
Use the value of the 'pessimistic' datasheet to be certain that it will trigger (10 MA here)
No reverse conduction!
With a triac connected in 'inverse' also
The triac is capable of triggering in all directions
In this sense, 7 mA instead of 12 mA
Self-holds for thyristor and triac. The triac is a double thyristor for the alternative