Rectifier diode
Suits in the line frequency application
In usual condition pressure drop is low, The VF dispersivity is small, Suits the parallel connection use transient state protect itself over press
Approval biggest avalanche power loss

Thyristor
Applies in the high efficiency industrial production and the electrical transmis-sion domain
Low pass condition pressure drop
Chooses appropriate Qrr and V the T component match, may connect in series orthe parallel use

Fast fuse