Two C-H double-throw switch versions [one set of movable blades versus two] are illustrated on page 26 of
www.eatonelectrical.com/unsecure/cms1/TB00800001E.PDF {Aaak! 5MB file}
Note also the two applications on page 24 fig. 8-7 — “two sources” versus “two loads”.
[This message has been edited by Bjarney (edited 04-05-2004).]