本规范涵盖了主要用于电气和电子设备、交流（ac）和直流（dc）应用的金属元件致动恒温开关的一般要求，其中需要温度保护、过热检测或精确的温度控制。本规范涵盖了开关的工作温度和工作温度范围（见3.1和6.2.2）。

This specification covers the general requirements for metallic-element actuated, thermostatic switches intended primarily for use in electrical and electronic equipment, in alternating current (ac) and direct current (dc) applications, where temperature protection, overheat detection, or accurate temperature control is required. The operating temperatures and operating temperature ranges of switches are covered by this specification (see 3.1 and 6.2.2).