Siemens ring network power supply grounding switch locking device

The utility model relates a Siemens ring network power supply grounding switch locking device, which comprises a mounting board and an electromagnet. The mounting board is arranged on an inlet unit operating mechanism support board, and the electromagnet is fixed onto the mounting board. The device is capable of locking operation of a grounding switch when a high-voltage inlet cable is live, preventing live false close of the grounding switch effectively, and preventing high-voltage grounding short circuit caused by misoperation. When the inlet cable is not live, operational locking for the grounding switch is released and normal operation of the grounding switch cannot be affected.