本规范涵盖了带照明和不带照明的指轮（见6.4.1）和带有未密封和密封模块的按钮式印刷电路旋转开关及相关硬件的一般要求。这些开关设计用于电子和通信设备中的低功率交流（ac）和直流（dc）开关应用。开关和安装硬件的采购将需要额外的数据，给出详细的电气和机械要求、公差，以及本文规定的一般要求和试验的适用补充和例外情况（见6.2）。

This specification covers the general requirements for illuminated and non-illuminated, thumbwheel (see 6.4.1), and push-button, printed circuit rotary switches having unsealed and sealed modules and the associated hardware. These switches are designed for low power alternating current (ac) and direct current (dc) switching applications for use in electronic and communication equipment. Procurement of switches and mounting hardware will require additional data, giving detailed electrical and mechanical requirements, tolerances, and applicable additions and exceptions to the general requirements and tests specified herein (see 6.2).