What the 8P2M-AZ is — a plain SCR for switching
The 8P2M-AZ is a silicon controlled rectifier (SCR), a three-terminal thyristor that switches on with a gate pulse and latches until the anode current drops below the holding threshold. It is a current-rated semiconductor switch for AC or DC power control in applications like motor speed controls, lighting dimmers, heater controllers, and overvoltage crowbar circuits.