Maybe i'm just dense... but i'm sure i've seen voltage ratings on certain transistors over 250volts, if so, could you not use (not going to TRY!, just in theory here..) 240vdc (rectified) and feed 0v/240v through the collector/emittor same as a solid state relay? or what's the differences exactly? I have no plans to try this so don't post a million warnings...
IRF710 10A 400V N Channel Power MOSFET Transistor TO-220
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Product Name MOSFET
Model No. IRF710
Channel Type N Channel
Drain Source Voltage 400V
Drain Current 10A
Mounting Hole Diameter 3.5mm/0.14''
Pin Size 14 x 2.5mm/0.6'' x 0.1'' ( L* Pitch)
Total Size 29 x 10 x 4mm/1.1'' x 0.4'' x 0.2'' (L*W*H)
Package 1 x N Channel MOSFET
Dynamic dV/dt Rating.
Repetitive Avalanche Rated.
Ease of Paralleling.
Simple Drive Requirements.
i'm happy to power 12v's but, if this is capable of switching 400V, then could one not use this instead of a Solid State Relay? (not going to try.. trust me...)