FIELD: automatic switching equipment. SUBSTANCE: as compared with two-link switching system this commutational device makes it possible to reduce internal interlocking and as compared with three-link switching system it enables number of units of switching equipment to be diminished. Effect is obtained by insertion of additional commutation unit 3 and by its connection with commutation units of first and second commutation links 1(1)-1(N) and 2(1)-2(N). EFFECT: enhanced operational reliability. 1 dwg
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