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The new scheme of protection of the engine DK 409 (DK406) of the compressor (EK 7B) on electric trains of series ER2 is offered. Such a scheme provides accurate and reliable protection of the electric machine, unites in itself the protection functions both under overloads with long-term currents and in case of short-circuit.doaj:90a50eb5c99a4eb49bcb3cf2fdb943a7 fatcat:wgn7dxumtvdrvkijifli7npmye