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