• 1. three-wire switch: 三线开关
• 2. three-wire white base flat switch: 三线白底平开关
• 3. three-wire rubber base flat switch: 三线胶底平开关

• 1.Especially three-phase four-wire active power filter hardware has simple structure with only three group switch device.
  特别是三相四线制有源电力滤波器硬件结构简单，只有三组开关器件。
  dict.yoduao.com
• 2.The heavy duty level regulator is a compact three-wire float switch for highly accurate and repeatable single point level sensing and control applications.
  重型级稳压器是一个小巧的三线高度精确和可重复的单一浮动开关点水平传感和控制应用。
  dict.yoduao.com

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