Digital switch to control high power lines.. is there anything like that ?

Hi , I am working on a power overload warning systems project for which i am in need of a switch that controls a high power line based on an external digital input . For example : the switch on the path of a 240V line , and also has an external input line which recieves binary input. the switch has to... show more Hi ,
I am working on a power overload warning systems project for which i am in need of a switch that controls a high power line based on an external digital input .

For example : the switch on the path of a 240V line , and also has an external input line which recieves binary input. the switch has to close if the input is 1 (5V) and open if 0 .

is there any switch available in the market which the meets the above requirement ? if not can anyone please help design it ?
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