With the widespread application of automatic control technology in machinery and equipment, industrial safety is increasingly being valued by people. Forced directional relay is a type of relay that can achieve safety goals through self fault detection. It constructs a monitoring circuit that can emergency stop in case of mechanical equipment failure or damage, ensuring the reliable operation of the system. In the design of a safety circuit, mandatory directional relays play a crucial role, and installation is mandatory in countries such as Europe and America. There are also national standard requirements in related application fields in China.

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