I have a few used Crydom solid-state relays for sale. I tested and they all work. I have 1 of the 50A and 5 of the 90A models available. Input is 3-32v, Output is rated for 240v. Model #'s D2450 and D2490. I was thinking $15 + shipping (from VA) for the 50A model and $20 + shipping for the 90A model.
