When it is gated "on", the silicon controlled rectifier (SCR) exhibits electrical characteristics similar to a:

An SCR is essentially a rectifier diode with a control gate. When the gate receives a sufficient voltage pulse, the SCR triggers "on" and begins to conduct current freely from the anode to the cathode. In this conducting state, it behaves just like a standard forward-biased silicon rectifier diode, allowing current to flow with a relatively small forward voltage drop. It remains latched in this conducting state until the main current drops below a specific holding threshold. Reverse-biased diodes block current flow, which directly contradicts the active, conducting "on" state of the triggered SCR.