Also called the forward-breakover voltage, this is the minimum forward voltage with the gate open that the SCR starts conducting. In other words, the point where the SCR is turned ON. For example, if the breakover voltage of an SCR is 100V, then it can block a forward voltage until the supply voltage is < 100V.
Peak Reverse Voltage
This is the maximum reverse voltage that can be applied to an SCR without conducting in the reverse direction.
It is the maximum anode current (with gate being open) at which the SCR is turned off from on condition.
Explanation: As discussed in our previous article, the SCR cannot be turned OFF by removing the Gate voltage. The only way to turn OFF or open the SCR is to reduce the supply voltage to almost zero, at which the internal transistor (refer to the below figure) comes out of saturation and opens the SCR.
Forward Current Rating
It is the maximum anode current that an SCR is capable of passing without destruction.
If an SCr has a forward current rating of 30 A, it means that the SCR can safely carry only 30 A; any attempt to exceed this value will result in SCR's destruction due to intensive heating at the junctions.