I've seen them which are capable of killing 1500 watt spikes. And you can use them parralel to gain more power.
What kind of voltage are talking here? Where have you seen them, on a controller, or just the part?
“The modern astrophysical concept that ascribes the sun’s energy to thermonuclear reactions deep in the solar interior is contradicted by nearly every observable aspect of the sun.” —Ralph E. Juergens