Motor control Selenium Rectifier Bad

[n1ist]

If you change it to a MOV, make sure you add a series fuse. MOVs tend to fail by shorting (and without a fuse, exploding and metal plating anything nearby)

 

[topgone]

if my Selenuim Rectifier has 16 plates( this the only information i know about my Selenuim), what would be the right spec for the MOV?

What do mean 16 plates? 16 plates per rectifier element or the total count of plates?