... chemical) as heat sensitive material which automatically open a circuit and switch off an appliance if the permissible operating temperature ... thermoelectric blower ,microwave oven,refrigerator etc as heat protectionpass TUV,UL,PSE,EK, CCC ,SGS Certification Order Information RYDXXX....XXX ... 48460157RYD999970157RYD10410480157RYD11011092157RUL,SGS certification ,TF:73-240celsius