In old telephone systems and in pinball machines they did exist.
if it is only to stop i would use a simple relays, as 9Amp is not very much a small H bridge is a good control thing have a look at racing cars, as they use 40 Amp controllers in very small packages.
if it is only to stop i would use a simple relays, as 9Amp is not very much a small H bridge is a good control thing have a look at racing cars, as they use 40 Amp controllers in very small packages.