Variac/Conventional Rectifier

These units are made up of diodes and air or oil cooled variac to control current stepless.

Advantages :

i. Rugged and reliable.

ii. Easy servicing and maintenance.

iii. Limited ripple content.

Disadvantages : .

i.Bulky and space consuming.

ii. Low efficiency.

iii. Slow response to auto process control.

iv. Not suitable for periodic servicing.

v. Susceptible to overheating in air cooled versions