Silicon Controlled Rectifier (SCR) are a great way to control the power of high voltage applications. This is a 200V 4A SCR transistor.
Insulated-Gate Bipolar Transistor is a high efficiency and fast switching transistor. Since IGBT is a three terminal power semiconductor, it can be used as an electronic switch.
Power Transistors are transistors which can handle a lot more power in compared to BJTs. Similar to BJTs, the current flow between the collector and the emitter of is controlled by the current flow through the base.
Triac are often used in high AC power control, they are able to switch in both parts of the AC waveform. This is a 400V 6A triac transistor.