The NTE5461 through NTE5468 series silicon controlled rectifiers are designed primarily for half− wave AC control applications such as motor controls, heating controls, and power supplies; or wherever half−wave silicon gate−controlled, solid−state devices are needed. These devices are supplied in a TO220 type package.

Full spec sheet:

https://www.nteinc.com/specs/5400to5499/pdf/nte5461_68.pdf