You can use 555 timer in the monostabile configuration (see picture below).
It can directly, or through additional transistor, control a relay, and this relay can work with 30Vac. This circuit can work with 6-15Vdc, which can be geerated of what you have available, 30Vac that is.
This simple circuit together with a small relay can be mounted on a veroboard ..
Calculations of R1 and C1 of the 555 timer to achieve 1min (or any other time) you can find here:
**broken link removed**
555 timers can be connected in a chain, so first triggs second, and so on ..
Last thing: what is the current in the 30Vac installation that you want to switch?
Regards,
IanP