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устройство автоматического ввода резерва stresses
el.	automatic transfer equipment
electr.eng.	automatic throw-over equipment; automatic transfer equipment (Equipment which automatically transfers a load so that a source of power may be selected from one of several incoming lines. – АД thefreedictionary.com); automatic transfer equipment (Equipment which automatically transfers a load so that a source of power may be selected from one of several incoming lines. thefreedictionary.com Alexander Demidov)
sec.sys.	power failure unit (eugene02130)