The new type DC solid state relay is a kind of new contactless switching device, with the new type IGBT and power field effect tube as the core and composed completely by solid state electron devices.

Optically triggered MOS gated solid state relay is a new switching device, which is composed of an MOS gated thyristor, a phototransistor, an enhanced mode MOSFET and a Zener diode.

Fluidized—bed furnace is a new type device for heat treatment, which utilises fluidization technology for moving solid particles in a state of suspension by the action of gases.