[ausev] MOSFETs for contactors?

[Mark Farver]

MLAB wrote:
> But if this is as easy, cheap, small, light, and efficient as it looks, 
> why aren't more MOSFET based contactors being sold for this kind of 
> application?  What am I missing?
>   
Two things spring to mind:

Contactors are generally capable of opening far greater amperages than a 
semiconductor without getting stuck on.  As such they make better safety 
shutdowns.

Contactors provide isolation between the coil and the contacts. 

There are "solid-state" relays available that do offer isolation, but 
they are hard to find in DC or in high amperages.


Mark