When scr is conducting current in forward conduction state,
scr will return to forward blocking state when the anode
current or forward current falls below a low level called
Holding current
Note: Latching current and Holding current are not same.
Latching current is associated with the turn on process of
the scr whereas holding current is associated with the turn
off process. In general holding current will be slightly lesser
than the latching current.