by pulse i mean a 12 V power supply switched on for as long as necessary to operate but obviously not non stop like a relay, it will be MCU controlled so I can meet most requirements, I haven't looked at the specs of those switched but they look rather large, i have the space of 1 or two automotive relays, maybe i need to find a suitable motor mechanism like... oh what: a servo ! how stupid of me not to think of the obvious ! a servo can easily push a switch, now I just need to figure out how to control one from an MCU