Double-throw switches

without 0-position	without spring return	without electrically isolated contacts
		with electrically isolated contacts
	with spring return	without electrically isolated contacts
		with electrically isolated contacts

with 0-position	without spring return	without electrically isolated contacts
		with electrically isolated contacts
	with both sides spring return	without electrically isolated contacts
		with electrically isolated contacts
	with one side spring return from 1 to 0 (positions 1-0-2)