DBQX型断相保护器由断相鉴别电路、时间产生控制电路、安全动态输出驱动电路等组成，它和保护继电器JWXC-1700配合，用于保护三相电动转辙机正常工作。产品稳定性好，故障率低；控制时间由单片机电路构成，准确性高，响应时间短；产品采用了标准的安全型继电器结构，便于安装使用。

DBQX type limited-time phase-failure protector consists of phase-failure discriminating circuit, time generation control circuit, safe dynamic output drive circuit, etc. It cooperates with JWXC-1700 protection relay to protect the normal operation of three-phase electric switch machine. The product features good stability and low failure rate. As the control time is composed by the microcontroller circuit, it has high accuracy and short response time. The product uses a standard safety relay structure, which is easy to install and use.