2N-6  -  Series DataSheet
2N6509G  -  SCRs 25 AMPERES RMS 50 thru 800 VOLTS Silicon Controlled Rectifiers  -  ON Semiconductor  -  Silicon Controlled Rectifiers

Designed primarily for half‐wave ac control applications, such as motor controls, heating controls and power supply crowbar circuits.
Features
•Glass Passivated Junctions with Center Gate Fire for Greater Parameter Uniformity and Stability
•Small, Rugged, Thermowatt Constructed for Low Thermal Resistance, High Heat Dissipation and Durability
•Blocking Voltage to 800 Volts
•300 A Surge Current Capability
•Pb-Free Packages are Available*