Is a short circuit that occurs for as long as an instance safe?
In the following schematic done from here, I have a silicon controlled rectifier that is used as a latch (the circuit simulation doesn't seem to be really accurate).
That white link thingy is a closed switch. In the diagram, the SCR is turned on and I have just closed the switch connected to ground. At this moment, a theoretical huge surge of current is going through the anode, out of the gate and through the switch to ground, which immediately turns off the SCR, so this stops and thus happens quicker than the blink of an eye.
In real life, I connected the gate to positive which turned the LED on and then connected the gate to negative, which turned the LED off with no problem.
However as shown in the previous image, it shows a large amount of current going through the anode of the SCR and out of the gate.
After looking around for a bit, I found an image (and added some edits) which gave me an idea as to where the simulator's result may have come from.
NOTE1: If gate is pulled to ground, the current would rather go through here than through the base of the NPN transistor out of the emitter to the cathode. This means no current is going out of the PNP transistor so the PNP transistor turns off and everything turns off. But is this safe?
Seems like a normal SCR can behave like a GTO thyristor.
The catch is, for a short moment when the gate is connected to ground before the SCR turns off, there would theoretically be a large surge of current going through the anode and out of the gate for a short period of time. Is this safe (in a way you can pass a safety regulation if selling as a commercial product, excluding the fact that the circuit allows you to enable both switches at the same time)? Can I do this to all thyristors? If not, what do I need to look for to ensure it's safe for certain types of thyristors to have their gates brought to ground?
I'm using a BT169D SCR, which is not labelled as a GTO thyristor but seemingly behaves like one.