... (organic chemical) as heat sensitive material the fuse will open a circuit when the temperature of appliances exceed specified TF levelThe ... oven,refrigerator etc as heat protectionpass TUV ,UL, CCC ,PSE,EK,SGS CertificationOrder InformationRYDXXX....XXX stand for rated Functioning Temperature(TF ... 48460157RYD999970157RYD10410480157RYD11011092157RYD1171EK approval,RoHs Compliant