This standard specifies the terms and definitions, basic requirements, basic parameters, technical requirements, test methods, inspection rules, and signs of external flat thermal protectors (hereinafter referred to as flat thermal protectors) for small fully enclosed refrigeration motors and compressors. , packaging, transportation and storage and quality commitment. This standard applies to flat thermal protectors installed on the surface of the casing of small fully enclosed refrigeration motor-compressors for household and similar refrigeration appliances.