Rigid catenary is widely used in urban rail transit project for subway train power supply. This paper mainly introduces a break-away joint device which can be installed in the rigid catenary. By using this joint device, the use of traditional bus exclusive joint and breaking contact wire can be avoided, thus reducing the risk of bow touching and electric arcing in the process of daily use. At the same time the air-defense door and flood gate can be closed quickly and the personnel don't need to go to the dangerous scene, ensuring the tunnel and civil air defense and flood gate system.%刚性接触网是城市轨道交通工程中广泛使用的给地铁列车供电的装置，本文主要介绍了可在刚性接触网中安装的可断开式接头装置，可以通过使用该接头装置，可以很好地避免使用传统汇流排外接头和断开式接触导线，降低日常使用过程中的碰弓、电拉弧风险，同时能在人员不用冒险到达现场的情况下快速关闭人防门和防淹门，很好地保障隧道同时兼顾的人防、防淹的作用。
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