Thanks Circuit. I have 20+ sets of points and, as you say, I would need two ASSR1611 for each, so it gets quite expensive. What I'm thinking of, to avoid shorts which happen if the micro switches are slightly out of sync with the point blades, is a program sequence which would disconnect the frog, actuate the servo to move the points, then connect the frog to the appropriate rail. But that will still cause a short if there's a mechanical disconnect between the servo and the points. But I'm going to experiment anyway
I run GF class 66, GF class 37, a Peco HST, a Peco 0-6-0, and a Peco Hall. I have a ring-main with feed at every track joint, but nevertheless there's the potential for the total current used by four locos to be passing through any particular point in the track, isn't there?
I was looking at RS, but I've just checked Farnell and they're not too bad at £2.64 for 25+, compared with about £1.70 for a single Peco microswitch.