Help needed regarding Relay Circuit

[sajidraheem]

I want my Microntroller circuit to start working (Get 5V VCC) when a 220V AC Supply in another circuit is turned of..
Like, if a machinery operating under 220V AC is turned off, my microcontroller should start working... i.e. it should get 5V

What kind of relay should I use? I havent used Relays before, so i have no idea of how to use them..

 

[brevor]

You need a relay with a coil voltage of 220 V. AC .
With normally closed contacts.