Switching between 3 30a 120v loads
The 3 position switch Johnny pointed out is listed to UL 508 for industrial control devices, so it should be acceptable for switching some general-use receptacles around.  (You'd be creating a tiny industrial control panel under Article 409 of the NEC -- your average junction box + cover combo meets NEMA 1, and there are provisions in the Code for an industrial control panel that's protected by the upstream breaker.)