[nznog] ATS Switch for 1-3 Devices

Hiya folks, Looking for a cost-effective solution to automatically switch a non-redundantly-powered device between redundant power supplies. For example running a single switch between a UPS-backed power supply and a direct-mains power supply, so that I have some tolerance should the mains supply to the UPS fail (or the UPS itself). Essentially something like this: http://www.cdlnz.com/index.html?do=viewproduct&p=NR605&code=RP-ATS But i'm looking for something relatively small and for a relatively low number of devices (say anywhere from 1 to 3). I'm also not necessarily looking for >10A 240V; the gear that'll be being run, is quite low current. Anyone got any recommendations? Thanks Mark.