Communication switching circuit for microcomputer protection device/motor protection device

The utility model relates to a communication switching circuit for a microcomputer protection device/a motor protection device. The communication switching circuit comprises a pair of electronic switches, the pair of electronic switches is used for connecting the port of the first communication mode and the port of the second communication mode; the control ends of the pair of electronic switchesare connected to the secondary side of one optocoupler; a primary side circuit of the optical coupler is connected with an IO port of the single-chip microcomputer. The beneficial effects of the utility model are that: if the communication mode needs to be changed, only the state of the MCU OUT needs to be configured, and the circuit and the software of the device can be solidified without changing according to client demands; therefore, the difficulty in design and production is reduced, and the requirements of customers are met. 本实用新型涉及一种用于微机保护装置/马达保护装置的通讯切换电路，包括一对电子开关；该一对电子开关用于连接第一通讯方式的端口和第二通讯方式的端口；该一对电子开关的控制端连接在一个