Hi Russel,

Yeah it was a little late when I posted lastnight, hence my post was a little outa whack! I was just thinking about some SSR devices we have used before that if memory serves run up to 100A (with heatsink!) and you only need to supply the unit with either a Potentiometer input, 0-10V or 0-20mA control. I have tested these units on a simple 100 watt light bulb load and there is no flicker, quite smooth control over the input range. I dont see why Reza Javan needs to re-invent the wheel so to speak... http://www.celduc-relais.com/uk/tablog...ettre1=g14 looking at the bottom of this table there are all three of the inputs I described above, with high voltage output and 110 amps... of course appropriate filtering/snubbing would still be needed!