Insel Rectifiers [India] Pvt. Ltd. Offers Aluminum Based Selenium Rectifier. Insel Rectifiers [India] Pvt. Ltd. Supplies different rectifiers like selenium, silicon diodes, thyristors, bridge rectifiers, modules, transformers, missile cables etc. Aluminum Based Selenium Rectifier is manufactured by closely controlled vaccum deposition process. Aluminum Based Selenium Rectifier ensure stable, non- agening, low loss characteristics permitting higher current density operation while maintaining a reliability standard. The elements of Aluminum Based Selenium Rectifier are available in two categories, series H & w. Both series are available in Voltage grades upto 36 volts