The present invention is to provide a working medium for heat cycle, which has inflammability suppressed, which has less influence over {HEAD ~ the ozone layer}, which has less influence over global warming and which provides a heat cycle system excellent in {TAIL ~ the cycle performance} , and a heat cycle system whereby safety is secured and which is excellent in the cycle performance  
The present invention is to provide a working medium for heat cycle , which has inflammability suppressed , which has less influence over { HEAD ~ the ozone layer } , which has less influence over global warming and which provides a heat cycle system excellent in { TAIL ~ the cycle performance } , and a heat cycle system whereby safety is secured and which is excellent in the cycle performance
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