Attach your main on/off circuit to a 220v/240v contactor with an industrial timer. Industrial timers can work from a large range of timing, buy the type which you need, 0-15 mins or 0-30 mins for your application. After some simple rewiring, it a cheap and effective solution probably cost you less than RM50, any electrician worth it's salt can do it for you. Press on button, contactor kicks in, power your equipment and timer starts, once timer is completed, contactor release and equipment stops.

This post has been edited by gark: Jun 7 2010, 08:39 AM