GATELEAD L=500 PB34-70 Gate Leads Infineon GATELEAD L=500 PB34-70 Gate Leads is for PowerBLOCK Thyristor modules. The GATELEAD L=500 PB34-70 has a base plate width of 70mm with a 5/4 terminal. The gate lead has a red gate lead color and an 'HK' lead color of white.