L--MN5--50/2620 series of hydraulic equipment used electromagnetic devices, the products using the latest international standards for structural design of advanced reasonable and applicable to the exchange of Pathology, 230V, 415V or 65V DC electrical system for the overload protection circuit, short-circuit protection, but also for non-frequency fan access and the breaking use, has been widely used in communications equipment, laser equipment, railway locomotive, gasoline generators and other fields.